# SlimAI vs MacroFactor: Adaptive Macros or Faster Logging?

MacroFactor has one of the strongest reputations in this category and it is a deserved one. It was built by fitness researchers, and the thing it is famous for is genuinely hard: rather than fixing your calorie target from a formula at setup, it re-estimates your actual energy expenditure every week from your logged intake measured against your weight trend, then moves your targets to match what your body is really doing.

That is more sophisticated than any static equation, including the one SlimAI starts from, and it is why MacroFactor is the reference choice for lifters, physique competitors, and anyone who already owns a food scale and uses it.

SlimAI Calorie Tracker is solving a different failure. Most people do not stop tracking because their expenditure estimate drifted. They stop because logging a meal takes too long. SlimAI offers six ways in — photo, voice, free text, barcode, printed nutrition label, and database search — with every AI result opening as an editable list of ingredients and weights, gram-level macro targets you set yourself, per-meal calorie budgets, and AI Body Assessment, which makes SlimAI the first AI calorie tracker with a built-in AI body fat calculator (based on publicly available feature listings as of August 2026).

SlimAI also reads the log back to you. AI Coach turns the week you logged into a smoothed weight trajectory, the meal type and weekdays that drove your calories, one win and at most one thing to watch, and a single next action, followed by a written report every Monday. Every sentence comes from fixed rules over your own numbers, so the output is deterministic — the same week always produces the same result, with no invented figures.

The rows below are dated and drawn from publicly available feature listings. MacroFactor wins several of them outright, including some of the most important ones, and those rows say so.

## Quick Verdict

Choose MacroFactor if you weigh your food and want the most rigorous macro adherence engine available. Its adaptive expenditure model, its fully verified database, and its depth of nutrition data are the strongest in this comparison, and SlimAI does not claim to match them.

Choose SlimAI if the thing that actually breaks your tracking is the friction of logging, or if you want body composition and habit tracking sitting alongside your macros rather than in three other apps. Six input methods, ingredient-level editing of any AI result, gram-level protein, carbohydrate and fat targets, per-meal budgets, fasting, water, steps, workouts, and AI Body Assessment all sit in SlimAI Pro at $7.99/month or $29.99/year, after a 3-day free trial.

A blunt way to decide: if you own a food scale and use it, MacroFactor is the better tool and this page will not argue otherwise. If your food scale is in a drawer and the reason your last tracking attempt ended was that logging a home-cooked dinner took four minutes, SlimAI is built for that exact failure.

One more split worth naming. MacroFactor adjusts your future targets so a heavy day never becomes a failure, which is an unusually mature piece of design. SlimAI instead tells you what is still available at the next meal, then reads the whole week back to you on Monday — a trajectory, the cause, one action — free, with cross-feature health patterns, one-tap food swaps, plateau detection, and single-question AI answers on a logged meal in SlimAI Pro.

## Where SlimAI Comes Out Ahead

Across 26 points of comparison, SlimAI leads on 14, is comparable on 4, and MacroFactor leads on 8.

- **Six ways in, not a search box and a scale** — Photo, voice, free text, barcode, printed nutrition label, and database search, plus recent, saved, and diet-plan logging. Publicly available feature listings describe MacroFactor entry as manual search with barcode scanning, saved foods, and user-built recipes, as of August 2026 — a deliberate choice that keeps its data clean, and also the reason a mixed home-cooked plate takes longer to enter.
- **Every AI result is a draft you can rewrite** — An estimate from a photo or a spoken sentence is a guess, and SlimAI says so plainly. What it does instead is make the guess correctable: each result opens as ingredients with weights you can edit, remove, or add to, with an add-missing-ingredient database, Similar Foods, and a Fix Results screen for restating the dish. Nothing is written to your day until you have reviewed it.
- **Gram-level macro control without the weighing workflow** — Protein, carbohydrate and fat targets in grams, set by SlimAI from your goal and overridable by you, shown in grams and percent on every logged meal, on recipe details, on the daily dashboard, and in weekly Insights. A manual macro split is stored as a ratio and re-applied whenever your calorie total changes, so an edit to your goal does not silently discard it.
- **Body composition, not only intake** — AI Body Assessment estimates body fat percentage, fat mass, lean mass, and regional fat distribution from two guided photos using published formulas — the US Navy circumference method, RFM, and CUN-BAE — or from tape measurements with no photos at all. It is a fitness estimate shown as a likely range with a confidence rating, for ages 18+, and is not a medical diagnosis. No photo-based body fat estimate is described in publicly available MacroFactor feature listings, as of August 2026.
- **One tier that covers habits as well as food** — Six intermittent fasting plans — 14:10, 16:8, 20:4, 22:2 OMAD, 6:1, 5:2 — utensil-based water logging, steps and workouts synced from Apple Health or Health Connect, streaks, and body composition, all inside SlimAI Pro rather than spread across separate subscriptions.
- **A weekly read that is deterministic by design** — AI Coach fits a trend line through exponentially smoothed weight logs, names the meal type and two weekdays that drove your calories and the dishes behind them, scores the week 0–100 across adherence, consistency, macro quality, and activity, and ends every insight in a button that opens the right screen prefilled. It runs on fixed rules over data you logged, so it invents no numbers and the same week always produces the same output. A written report follows every Monday.

## Feature Comparison (as of August 2026)

### AI logging

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| Main positioning | These apps are solving two different failures of the same activity. | Remove the guesswork: a verified database and a weekly re-estimate of your real energy expenditure, for people who intend to weigh and log accurately. | Remove the friction: six ways to log, editable AI estimates, per-meal budgets, habits, and body composition in one connected picture. | Comparable |
| Ways to log a meal | Every route into the log is a meal recorded instead of skipped. | Manual search entry and barcode scanning, with saved foods and user-built recipes to speed up repeats, per publicly available feature listings as of August 2026. Photo, voice, and free-text logging are not described. | Six: photo, voice, free text, barcode, printed nutrition label, and database search, plus recent, saved, and diet-plan logging. | SlimAI advantage |
| Time to log an unfamiliar mixed meal | Time cost per meal is the strongest predictor of whether tracking survives a month. | Longer by design: components are searched, selected, and ideally weighed, which is exactly what makes the resulting numbers trustworthy. | Seconds for a photo or a spoken sentence, with a review step before it saves. | SlimAI advantage |
| Correcting a wrong estimate | How an app handles a wrong result decides whether the entry gets abandoned. | Largely not applicable: you choose each entry yourself, so there is rarely a machine estimate standing between you and the number. | Ingredient-level editing with weights, an add-missing-ingredient database, Similar Foods, and a Fix Results screen for restating the dish. | SlimAI advantage |
| Accuracy when you weigh your food | For a lifter cutting to a deadline, the input method is not the bottleneck. | The whole workflow assumes a scale and rewards it. Weighed portions against verified entries produce the most defensible intake figure of any app in this comparison. | Weights can be entered or edited per ingredient, and a scale improves any entry — but the workflow is optimised for speed rather than for gram-accurate weighing. | MacroFactor leads |

### Nutrition depth

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| Food database quality | A crowd-sourced duplicate can be wrong in ways the interface never reveals. | A fully verified, curated database with no user-submitted duplicates — one of the two things it is best known for, and a clear win over any crowd-sourced catalogue. | 50K+ curated food items with ingredient-level editing and an add-missing-ingredient database. Smaller than the largest catalogues, and weaker on obscure regional grocery brands. | MacroFactor leads |
| Depth of nutrition data | Some people need more than calories and three macros. | Extensive micronutrient data attached to verified entries, tracked against targets, per publicly available feature listings as of August 2026. | Percent-of-daily-value rows for sugar, saturated and unsaturated fat, cholesterol, sodium, and potassium alongside calories and macros. Full vitamin and mineral tracking is not offered. | MacroFactor leads |
| Macro targets in grams | Training to a split needs gram figures, not percentages alone. | Gram-level macro targets are the core of the product, presented against the full nutrition picture. | Protein, carbohydrate and fat in grams and percent across every logged meal, recipe details, the daily dashboard, and weekly Insights, against gram-level targets you can set yourself. | Comparable |
| Macro adherence over a training block | Hitting a split for one day is easy; holding it across a cut is the actual problem. | Adherence tracking against weekly-adjusted targets is the product, and it is the most rigorous implementation of that idea in this category. | Weekly Insights show macro quality as one component of a 0–100 weekly score, with adherence read back to you on Monday. | MacroFactor leads |

### Goals & guidance

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| How your calorie target is calculated | Every formula-based target is an estimate of a number that varies between individuals. | Energy expenditure is re-estimated every week from your own logged intake measured against your weight trend, so the target reflects your measured response rather than a population equation. This is the strongest single feature in the comparison. | Generated from goal and pace, target weight, body type, activity level, preferred diet, cuisine, and optional health details — all overridable — and rerun whenever any of those inputs or your latest weigh-in changes. | MacroFactor leads |
| Adjusting when progress stalls | A target set in January is rarely the right target in March. | Targets move every week as expenditure is re-estimated, so a stall is absorbed continuously rather than detected after the fact. Faster and more granular than a periodic adjustment. | Plateau detection calls a stall only after roughly 14 days of a flat weight trend with solid logging behind it, then proposes one change — a step down in calories or 2,000 extra daily steps — which you must approve and can undo, with a gender-aware calorie floor, a rate cap near 1% of bodyweight per week, and suppression for any stated medical condition. Part of SlimAI Pro. | MacroFactor leads |
| Handling a day you went well over | What an app does after a bad day decides whether there is a next day. | Deliberately non-judgemental: a heavy day is folded into the following week of targets rather than flagged as a failure. It is a quietly excellent piece of behavioural design and it deserves the credit it gets. | The day is recorded as it happened, per-meal budgets reset the following morning, and the weekly score is framed as a lever rather than a grade, with no red and no fail state. | MacroFactor leads |
| Per-meal guidance | A daily total does not tell you what is left for dinner. | Progress is shown against daily and weekly targets rather than per-meal budgets with status, per publicly available feature listings as of August 2026. | A recommended calorie budget per meal with a live status — Over Limit, Not taken, Need to Eat, Optional — and a serving stepper suggesting the fraction that still fits. | SlimAI advantage |

### Coaching & insights

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| Weekly coaching read from your own log | Adjusted targets still leave the question of what drove the week. | Weekly target adjustments and trend charts are presented for you to read, per publicly available feature listings as of August 2026; a weekly narrative naming the meal type and weekdays behind your calories, with one prefilled next action, is not described. | AI Coach answers three questions a week — where your weight is heading, what drove it, and the one next action — from a smoothed weight trend, meal-type and weekday attribution, a win and watch pair, and a 0–100 weekly score, with each insight ending in a button that opens the right screen prefilled. | SlimAI advantage |
| Written weekly report | Most people do not sit down with their own charts on a Sunday. | Trend and adherence charts with data export are strong; a generated written weekly report with ranked insights and a single recommendation is not described, as of August 2026. | A written report every Monday: calorie average against goal, days on target, best day, macros, weight change, body-fat change when a body scan exists, two to three ranked insights, and one recommendation. Free for all users, and a quiet week still gets one. | SlimAI advantage |
| Cross-feature health patterns | Comparing your own fasting, training, and hydration days needs them in one app. | Fasting, hydration, and body-composition data are outside the product, so no cross-feature pattern of this kind is described, as of August 2026. | One observed pattern a week from nine rules across your own log — fasting versus non-fasting days, training versus rest, protein on training days, low-water days, late eating, planned versus improvised meals, and lean-mass change across two body scans. Each states its sample size and is phrased as an observation, never a cause. Part of SlimAI Pro. | SlimAI advantage |

### Habits & wellness

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| Fasting and hydration | Tracking these elsewhere means a second subscription and a split picture. | Meal timing can be inferred from logged entries; dedicated fasting plans and hydration tracking are not described, as of August 2026. | Six fasting plans — 14:10, 16:8, 20:4, 22:2 OMAD, 6:1, 5:2 — with window reminders scheduled server-side, plus utensil-based water logging against a daily goal with history and a suggested intake. | SlimAI advantage |
| Steps and workouts | Activity is either part of the balance or deliberately excluded from it. | Exercise is intentionally not added back, because the weekly expenditure re-estimate already absorbs whatever you burned. Coherent within its model, but there is no step or workout tracking to speak of. | Workout logging, steps with a user-set goal, Apple Health and Health Connect sync, back-dated exercise, and an Add Back Calories Burned setting you control. | SlimAI advantage |
| Body composition | Intake data alone does not show what your body did with it. | Weight and body measurements can be entered and charted; no photo-based body fat estimate is described, as of August 2026. | AI Body Assessment estimates body fat percentage, fat mass, lean mass, and regional distribution from two guided photos or from tape measurements, as a likely range with a confidence rating. | SlimAI advantage |
| Streaks and consistency | Consistency predicts results more reliably than precision does. | Gamified streaks are deliberately absent, which is consistent with its non-judgemental design and will suit some users better than a streak counter. | Longest streak, logged days, perfect days, goal-reached days, achievements, and server-scheduled reminders that arrive after days of inactivity. | SlimAI advantage |

### Transparency & control

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| How estimates are produced | Both apps take this seriously, from different directions. | The expenditure model and its reasoning are documented publicly and explained in detail by the researchers behind it — an unusually open position for an algorithm of that kind. | An in-app Sources & References screen discloses the basis for calorie, portion, and burn estimates; Body Assessment names its formulas — US Navy circumference method, RFM, CUN-BAE. | Comparable |
| Language support | Tracking in a second language adds a step to every meal. | Primarily English-language, as of August 2026. | Seven languages — English, French, German, Italian, Spanish, Dutch, Arabic — including spoken guidance during a body scan. | SlimAI advantage |

### Pricing & access

| Aspect | Why it matters | MacroFactor | SlimAI | Verdict |
|---|---|---|---|---|
| What the subscription buys | What a single tier covers is the practical cost question. | A single subscription covering the adaptive expenditure model, the verified database, and its nutrition data. Check the current listing for pricing. | One tier, SlimAI Pro, at $7.99/month or $29.99/year, covering AI logging, macros, fasting, water, steps, workouts, progress, and AI Body Assessment, after a 3-day free trial. | Comparable |
| Using the app without paying | How much you can do without paying decides how long you can evaluate. | Publicly available listings describe no free tier as of August 2026 — the product is subscription-only after its trial period, which is a real barrier if you want to evaluate slowly. | Free to download and start tracking, with unlimited scans, Speak and Get Your Recipe, Type to Log, and Body Assessment photo analysis in SlimAI Pro. The AI Coach card, weight trajectory, calorie attribution, weekly score, and the Monday weekly report stay free, and a 3-day free trial covers evaluation of the rest. | SlimAI advantage |
| Number of apps needed | A second subscription is a real cost. | Food and macro tracking are covered thoroughly; fasting, hydration, step tracking, and body composition would each need something else. | One app covers food, macros, fasting, water, steps, workouts, and body composition. | SlimAI advantage |
| Data portability | Switching costs should be stated, not discovered. | Importing from other trackers and exporting your own data are both supported, per publicly available feature listings as of August 2026 — a genuine advantage if you are carrying years of history. | No import of another app diary history. Weight trend, streaks, and insights build from your first log; Body Assessment gives a composition baseline in session one. | MacroFactor leads |

## The Adaptive Expenditure Model, and Why It Wins That Row

Almost every calorie tracker, SlimAI included, starts from an equation. You enter height, weight, age, sex, and an activity level, and a formula produces a maintenance figure that a goal and a pace then adjust into a daily target. It is a reasonable starting point and it is wrong for a meaningful share of people, because between two individuals with identical inputs the real figure can differ by several hundred calories.

MacroFactor treats that estimate as a hypothesis to be tested. It watches your logged intake against your weight trend and re-derives what your expenditure must actually be for those two series to be consistent, then updates your targets weekly on that basis. It is the correct approach, it was built by people who study this, and no amount of AI logging speed substitutes for it.

SlimAI does something narrower. It reruns the whole calculation whenever an input changes — a weigh-in that is your latest reading, a change of goal, pace, activity level, body type, or cuisine — updating your daily calorie target, your protein, fat and carbohydrate grams, your per-meal budgets, your BMI, your diet plan, your stats and coach, and your home-screen widgets in one save, with the resulting target shown live while you edit. Separately, plateau detection watches for a flat trend over roughly 14 days with solid logging behind it and proposes exactly one change, which you approve and can undo.

That is periodic and conservative where MacroFactor is continuous and statistical. Both are honest designs. Only one of them is a genuine expenditure model, and it is not SlimAI.

## The Assumption Underneath MacroFactor

The expenditure model has a prerequisite that is easy to skip past: it only works if your logged intake is close to your real intake. Feed it a week of guessed portions and it will faithfully re-estimate your expenditure from bad data and hand you a target built on the error.

That is not a flaw in the design. It is a statement about who it is for. If you weigh your food, the assumption holds and the model repays the effort every week. If you have historically under-logged — the snack that was not entered, the restaurant meal approximated at half its true calories, the weekend that went unlogged entirely — the input problem has to be solved before the algorithm can help you.

SlimAI attacks that input problem directly. Photo, voice, and free-text entry exist so that the meal you would otherwise skip gets recorded at all, and every result opens as an editable ingredient list so an estimate that reads the plate wrong can be corrected rather than abandoned. Calorie and portion figures from any AI are estimates rather than measurements, and SlimAI says so in the app.

The honest framing is that these are two different bets about where accuracy is lost. MacroFactor bets it is lost in the model. SlimAI bets it is lost in the meals nobody logged.

## What a 50K+ Curated Database Does and Does Not Cover

MacroFactor reputation for data quality is well earned. A fully verified, curated catalogue with no user-submitted duplicates removes an entire class of quiet error that crowd-sourced databases carry, where three entries for the same product disagree and nothing in the interface tells you which one is right.

SlimAI ships a database of 50K+ curated food items. That is smaller than the largest catalogues in this category, and it is weaker on obscure regional grocery brands — a supermarket own-label product in a smaller market may not be there. Barcode scanning and printed nutrition label capture cover a good deal of that gap, and any missing ingredient can be added to an entry by hand, but the honest position is that database breadth is not where SlimAI competes.

Where it does compete is on what happens after a lookup fails. In a search-driven app, a dish that is not in the database becomes a manual recipe build. In SlimAI it becomes a photo, then an ingredient list you adjust.

## Not Flagging the Bad Day, and Reading the Week Back

One of the better decisions in MacroFactor is behavioural rather than mathematical. A day that went well over target is not marked as a failure; it is absorbed into the following week of adjusted targets. For anyone whose relationship with tracking has been shaped by red numbers and broken streaks, that is a materially kinder product and it is a considered piece of design, not an accident.

SlimAI arrives at something similar from a different angle. Per-meal budgets reset every morning, the weekly score is presented as a lever rather than a grade with no red and no fail state, and a coaching screen never carries more than one negative or a negative without a paired win. It also keeps streaks, which some people find motivating and others find punitive — if streak mechanics are the thing that has previously made tracking feel worse, that is a genuine point in favour of MacroFactor.

What SlimAI adds is interpretation. AI Coach smooths your weight logs with an exponential moving average over a 14-day span and fits a least-squares trend line through the smoothed points, then names the meal type that dominated the week, the two costliest weekdays, and the dishes behind them, and scores the week 0–100 across calorie adherence, logging consistency, macro quality, and activity.

It is built to be conservative rather than impressive. Every rule declares a minimum sample — four logged days, three weigh-ins — and stays silent below it, naming exactly what is missing instead of guessing. When the trend is flat or moving away from your target, no arrival estimate appears at all. No language model writes any of it, so the figures are drawn only from your own log and the same week always produces the same sentence.

## What SlimAI Adds Beyond the Macros

Macros are one signal. AI Body Assessment adds a second: body fat percentage, fat mass, lean mass, and regional fat distribution estimated from two guided photos using published formulas — the US Navy circumference method, RFM, and CUN-BAE — or from tape measurements with no photos at all. It makes SlimAI the first AI calorie tracker with a built-in AI body fat calculator, based on publicly available feature listings as of August 2026.

Photos are stored privately, encrypted in transit, EXIF-stripped, and deleted on request. Results are shown as a likely range with a confidence rating, support ages 18+, and are a fitness estimate rather than a medical diagnosis or a clinical body composition measurement.

Because fasting, water, training, meal timing, and body scans all live in the same app, SlimAI can also compare them against each other: your fasting days against your own non-fasting days, training days against rest days, and lean-mass change across two body scans — which is the one question a scale can never answer during a cut. Each pattern states its sample size and is written as an observation rather than a cause. Health Patterns, one-tap food swaps, plateau detection, and Ask About Your Meal are part of SlimAI Pro; the coach card, trajectory, attribution, weekly score, and Monday report are free.

## Who Should Choose SlimAI?

Someone whose tracking keeps ending because logging takes too long. Someone who eats home-cooked or regional food that no database describes cleanly. Someone who wants gram-level macro targets without adopting a weighing workflow. Someone who wants fasting, water, steps, workouts, and body composition inside one subscription instead of four apps. Someone who wants a body fat estimate rather than only a weight trend. Someone who wants to try a macro tracker without paying on day one.

## Who Should Choose MacroFactor?

Anyone who weighs their food, or intends to. Anyone running a structured cut, bulk, or contest prep where the target needs to track their real expenditure week by week. Anyone who wants a verified database with no duplicate entries as a matter of principle. Anyone who wants depth of nutrition data behind their macros. Anyone whose tracking history has been damaged by apps that treat a heavy day as a failure.

Those are strong reasons and SlimAI does not attempt to match all of them. Neither app is a medical device; anyone managing a health condition should work with a qualified healthcare professional.

## Switching from MacroFactor to SlimAI

This direction is usually about friction rather than dissatisfaction with the maths. Four things to expect.

- **You are giving up the adaptive expenditure model** — This is the real trade and it should be deliberate. SlimAI recalculates your targets from your inputs and your latest weigh-in, and detects a plateau after roughly 14 days of a flat trend before proposing one approved, undoable change. That is periodic, not a weekly statistical re-estimate of your expenditure. If that model is why you track, do not switch.
- **Export your history first** — MacroFactor supports data export and SlimAI does not import another app diary. Take the record with you, particularly the weight series, which is the part you cannot reconstruct.
- **Set your macro targets manually on day one** — SlimAI generates protein, carbohydrate and fat grams from your goal, pace, body type, activity level, and preferred diet, and every one of those numbers is overridable. If you had a split you were happy with, enter it directly — it is stored as a ratio and re-applied whenever your calorie total changes.
- **Run Body Assessment in the first session** — Two guided photos or a set of tape measurements gives you body fat, fat mass, lean mass, and regional distribution as a baseline immediately, instead of waiting several weeks for a weight trend to become readable.

## Frequently Asked Questions

### Is MacroFactor or SlimAI better for macro tracking?

For rigorous macro tracking, MacroFactor is the better tool, and it is worth saying that plainly. Its targets are driven by an adaptive model that re-estimates your energy expenditure each week from your logged intake and weight trend, its database is fully verified with no user-submitted duplicates, and its nutrition data goes deeper. If you weigh your food, that combination is the strongest in the category. SlimAI gives you gram-level protein, carbohydrate and fat targets you can set yourself, macros in grams and percent on every logged meal and in weekly Insights, per-meal calorie budgets, and ingredient-level editing of any AI result — and it wins on how quickly a meal gets into the log at all. Choose MacroFactor for the most rigorous adherence engine; choose SlimAI if the thing that breaks your tracking is the friction of logging.

### What is MacroFactor adaptive expenditure and does SlimAI have it?

MacroFactor re-estimates your actual energy expenditure each week by comparing what you logged against how your weight trend moved, then adjusts your targets to match, per publicly available feature listings as of August 2026. It is more sophisticated than a static formula and SlimAI does not have an equivalent. What SlimAI has is a full recalculation whenever an input changes — a weigh-in, a goal, a pace, an activity level — plus plateau detection that waits for roughly 14 days of a flat weight trend with solid logging behind it before proposing one change, such as a step down in calories or 2,000 extra daily steps, which you must approve and can undo.

### Which app is faster for logging food?

SlimAI, by a wide margin, and deliberately so. It offers six input methods — photo, voice, free text, barcode, printed nutrition label, and database search — and every AI result opens as an editable ingredient list with weights, plus Similar Foods and a Fix Results screen when the estimate misses. Publicly available MacroFactor listings describe manual search entry and barcode scanning with saved foods and user-built recipes, as of August 2026. That is slower per meal and it is the price of a verified database, which is a defensible trade if you are willing to pay it.

### Does MacroFactor have a free version?

Publicly available listings describe no free tier as of August 2026; it is a subscription product after its trial period. SlimAI is free to download and start tracking with, and the AI Coach card, weight trajectory, calorie attribution, weekly score, and the Monday written report stay free. The features gated behind SlimAI Pro — unlimited scans, Speak and Get Your Recipe, Type to Log, AI Body Assessment photo analysis, Health Patterns, Smart Food Swaps, plateau detection, and Ask About Your Meal — cost $7.99/month or $29.99/year after a 3-day free trial. For pricing on any other app, check the current store listing rather than any figure quoted on a comparison page.

### Is SlimAI accurate enough for a cut or a bulk?

It depends on how tightly you need to hold the numbers. SlimAI produces calorie and portion figures as estimates rather than measurements and says so in the app, with an in-app Sources & References screen disclosing how those estimates are produced. Every result is editable at the ingredient level with weights, so entering weighed portions gives you a tighter figure than a photo estimate alone. For a general fat-loss or lean-gain phase that is usually sufficient. For contest preparation or a cut where a hundred calories a day changes the outcome, MacroFactor combination of a verified database and a weekly expenditure re-estimate is the better instrument.

### Can MacroFactor estimate body fat percentage?

MacroFactor accepts weight and body measurements you enter and charts them; no photo-based body fat estimate is described in publicly available listings as of August 2026. SlimAI is the first AI calorie tracker with a built-in AI body fat calculator, based on publicly available feature listings as of August 2026. AI Body Assessment estimates body fat percentage, fat mass, lean mass, and regional fat distribution from two guided photos using published formulas — the US Navy circumference method, RFM, and CUN-BAE — or from tape measurements with no photos, shown as a likely range with a confidence rating. It supports ages 18+ and is a fitness estimate, not a medical diagnosis.

### How big is SlimAI food database compared with MacroFactor?

SlimAI ships 50K+ curated food items, which is smaller than the largest catalogues and weaker on obscure regional grocery brands. MacroFactor database is fully verified and curated with no user-submitted duplicates, which is one of the strongest data-quality positions in the category and a clear win on this row. What SlimAI offers instead is a different route when a lookup fails: photo, voice, or free-text entry produces an ingredient list you can edit, remove from, or add to, and printed nutrition label capture handles packaged products the database has not indexed.

### Does SlimAI have an AI coach, and is it a chatbot?

SlimAI includes AI Coach, which reads the week you already logged and answers three questions: where your weight is heading, what drove it, and the single next action, each ending in a button that opens the right screen prefilled, with a written report every Monday. It runs on fixed rules over your own logged data, so it is deterministic and invents no numbers — the same week always produces the same output, and every rule stays silent below its minimum sample rather than guessing. The one generative surface is Ask About Your Meal, which answers a single question about one logged dish from its stored analysis, with no conversation thread by design and no medical advice.

### Does MacroFactor track fasting, water, or steps?

Publicly available listings describe MacroFactor as focused on food, macros, and expenditure, as of August 2026; fasting plans, hydration tracking, and step tracking are not part of it, and exercise calories are intentionally not added back because the weekly expenditure re-estimate already accounts for them. SlimAI includes six fasting plans — 14:10, 16:8, 20:4, 22:2 OMAD, 6:1, 5:2 — utensil-based water logging, steps with a user-set goal, workout logging, and Apple Health and Health Connect sync, all inside SlimAI Pro alongside calorie and macro tracking.

### Can I move my MacroFactor history into SlimAI?

No. SlimAI does not import diary history from another app, and that is a real switching cost worth stating up front. MacroFactor supports data export, so take your record — especially your weight series — before you leave. In SlimAI, the weight trend, streaks, and coaching insights build from your first log, and AI Body Assessment gives you a body composition baseline in the first session rather than making you wait for weeks of data.

Source: https://www.slimai.ai/compare/slimai-vs-macrofactor

## Try SlimAI

To try SlimAI, download SlimAI Calorie Tracker from the Apple App Store or Google Play and start the 3-day free trial; SlimAI Pro is then $7.99/month or $29.99/year (under $3/month), and can be cancelled anytime from the Apple or Google account that manages the subscription.

- Apple App Store: https://apps.apple.com/us/app/slimai-calorie-tracker/id6749062571
- Google Play: https://play.google.com/store/apps/details?id=com.slimai.app
- Desktop (QR code): https://www.slimai.ai/download