What Is the Best Free Keto Macro Tracker in 2026?

The best free keto macro tracker in 2026 is Carb Manager free for the sharpest net-carb calculation, or Cronometer free for the most precise per-gram macro accuracy. For fully adjustable 70/20/10 targets, standard or targeted or cyclical keto presets, AI logging, and bidirectional health syncing — Nutrola's free trial delivers every premium macro feature at zero cost, then just €2.50/month if you continue.

Keto is not a calorie diet. It is a macro diet, and the entire metabolic premise — producing ketones, lowering insulin, shifting fuel from glucose to fat — depends on the exact gram split you hit each day, not the total calories you consume. That is a fundamentally different tracking problem than weight-loss calorie counting, and most free apps were not built to solve it.

This guide evaluates every major free macro tracker through a ketogenic lens: can it lock a 70% fat / 20-25% protein / 5-10% carb ratio, does it calculate net carbs correctly, and does it surface the gram-level precision that keeps you in ketosis?

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What Should Keto Users Look for in a Free Macro Tracker?

Does the app truly support the 70/20/10 macro split?

Standard ketogenic macros run roughly 70% fat, 20-25% protein, and 5-10% carbohydrate of total calories. Most free macro trackers were built for a default 40/30/30 or 50/25/25 weight-loss split and either refuse to accept a 70/20/10 distribution or silently renormalize your numbers behind the scenes. A proper keto tracker lets you set macro targets as either percentages of calories, absolute grams per day, or both, and holds those targets without nudging you back to a generic ratio.

Adjustability also matters for variations. Targeted keto bumps carbs around workouts. Cyclical keto runs high-carb refeeds. Therapeutic keto for medical conditions can push fat above 80%. If an app only offers a single keto preset, it does not really support keto — it supports one version of keto.

How does the app calculate net carbs?

Net carbs (total carbohydrate minus fibre, and in some regions minus sugar alcohols) is the number most ketogenic eaters actually care about, because fibre and most sugar alcohols do not raise blood glucose. A free keto macro tracker that only shows total carbs forces you to do mental math on every label and loses the entire point of the diet.

The better free trackers display both total and net carbs, let you toggle which one counts toward your daily limit, and allow per-food overrides for sugar alcohols (erythritol almost never counts, maltitol often does). Apps that flatten everything into a single "carbs" number force keto users to build their own spreadsheet alongside the tracker.

Can you see macros as both grams and percentages?

A percentage tells you whether your overall day is ketogenic. A gram count tells you whether your next meal pushes you over the carb ceiling. Experienced keto eaters need both, ideally in a single view, because a 20-gram net carb ceiling is absolute — it does not flex with calories eaten the rest of the day.

Macro rings, dials, or bars that update live as you log, showing grams eaten and grams remaining alongside the percentage split of the day, are the baseline keto UI. A free app that only shows a calorie bar with three tiny percentages underneath is not a keto tool.

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Ranked: Best Free Keto Macro Trackers in 2026

1. Carb Manager Free — Sharpest Net-Carb Calculation

Carb Manager was built for keto first and still has the tightest free net-carb logic among mainstream apps. The free tier displays net carbs by default, separates fibre and sugar alcohols on every entry, and keeps a running daily net-carb budget that is visually impossible to miss. For keto users whose single biggest daily question is "how many net carbs do I have left," Carb Manager free answers it fastest.

What you get for free: Net carb tracking, basic macro logging, food database search, barcode scanner, daily net-carb budget, basic ketogenic food suggestions.

What you do not get: Full customization of fat/protein/carb ratios (premium), advanced reports, detailed micronutrients, voice and AI logging, recipe import, ketone and glucose tracking depth.

Keto-specific strengths: Net carbs are a first-class number rather than an afterthought. Sugar alcohols are handled correctly out of the box. The visual daily net-carb budget keeps keto discipline simple.

Keto-specific limitations: Precise 70/20/10 adjustment is paywalled, meaning free users are often steered toward a generic low-carb default rather than a true ketogenic split. Percentage-and-grams dual view is limited on free. Protein-over-consumption warnings require the paid tier.

2. Cronometer Free — Most Precise Per-Gram Macro Accuracy

Cronometer delivers the most nutritionally accurate free macro data in the category. Its database is sourced from USDA, NCCDB, and manufacturer-verified entries, meaning the grams of fat, protein, and carbs you log on Cronometer are measurably closer to reality than on crowdsourced databases. For keto users who care about staying under 20 grams of net carbs, that per-gram accuracy is the difference between hitting ketosis and slipping out of it without knowing why.

What you get for free: Verified-database food logging, full macro tracking in grams and percentages, net carb calculation (total carbs minus fibre), custom macro targets in grams, basic micronutrient breakdown.

What you do not get: Custom macro targets in percentages on the tightest free slice (grams only in some regions), recipe importer, full barcode scanner on free, advanced keto reports, AI logging, ketone and glucose correlation.

Keto-specific strengths: The verified database is the strongest argument for Cronometer on keto — inaccurate gram counts on a 20g net-carb ceiling destroy the diet, and Cronometer minimises that risk. Macro targets can be set in grams, which matches how keto is actually eaten.

Keto-specific limitations: The free net-carb calculation does not always account for sugar alcohols the way dedicated keto apps do. The interface is data-dense rather than keto-native, and the daily-log limits on certain free configurations can interrupt high-frequency logging.

3. MyFitnessPal Free — Largest Database, Weakest Keto Macro Support

MyFitnessPal remains the largest food database on the market, which matters on keto because restaurant meals and packaged low-carb products are frequently only listed there. Unfortunately, the free tier restricts exactly the features keto users rely on most.

What you get for free: Largest food database, barcode scanner, basic calorie and macro logging (percentages only), food diary, basic community features.

What you do not get: Custom macro goals in grams (premium only — free is limited to fixed percentage presets), net carb mode, adjustable keto ratios, detailed nutrient breakdowns. Heavy ads throughout the experience.

Keto-specific strengths: Database breadth means fewer "food not found" moments at restaurants or with niche keto products. Crowdsourced entries often include custom keto recipes.

Keto-specific limitations: The free tier will not let you set macro goals in grams — it forces percentages of a shifting calorie target, which is almost the opposite of how keto should be tracked. No native net-carb display. Database accuracy varies widely because entries are user-submitted, which is a real risk on a 20g daily ceiling.

4. FatSecret Free — Complete Free Macros, No Keto Specialisation

FatSecret offers one of the most generous free macro tiers, with full gram-level tracking of protein, carbohydrate, and fat and no premium gate on the basic nutrition screen. It is the default choice for users who want keto-compatible macro tracking without paying anything — as long as they do not mind doing a little manual work.

What you get for free: Full macro tracking in grams, unlimited logging, barcode scanner, recipe calculator, community recipes, weight tracking, exercise logging.

What you do not get: Dedicated keto mode, automatic net-carb field, adjustable 70/20/10 preset, AI logging, verified database, ketone and glucose tracking.

Keto-specific strengths: Full macros in grams for free is rare, and keto users can set their own custom gram targets that reflect a 70/20/10 split. Unlimited logging means high-frequency keto tracking is not rate-limited.

Keto-specific limitations: No native net-carb calculation — you must subtract fibre yourself on every entry, or build custom foods that pre-bake net carbs. No keto preset or guidance for targeted/cyclical variations. The crowdsourced database introduces accuracy risk at keto-level precision.

5. Senza Free — Keto-Native but Thin on Macros

Senza is a keto-specialist free app with a clean interface, ketone logging, and carb-focused logging. It is explicitly designed for keto users, which is rare. However, its free macro precision is thinner than Carb Manager or Cronometer, and the broader feature set is paywalled.

What you get for free: Net-carb-centric logging, basic macro tracking, barcode scanning, keto food lists, community content, basic ketone log.

What you do not get: Granular gram-level macro targets on free, deep verified database, AI logging, advanced reports, fully adjustable keto variant presets, comprehensive micronutrients.

Keto-specific strengths: Every part of the UI assumes you are on keto. Net carbs are the default display. Food suggestions are keto-compatible. There is no "weight loss" baggage to work around.

Keto-specific limitations: Free macro controls are simpler than Carb Manager's free tier. The database is smaller than MyFitnessPal or Cronometer. Gram-accurate logging for non-keto-specific foods (restaurant meals, ethnic cuisine) is often weaker than in generalist apps.

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How Do Free Macro Trackers Calculate Keto Macros?

Why does calculation method matter more on keto than on any other diet?

On keto, the numbers have to be right at the gram level. A weight-loss user eating 2,000 calories can absorb a 50-calorie logging error across a day without consequence. A keto user with a 20-gram net-carb ceiling cannot absorb a 5-gram error, because it is 25% of the daily budget. Free apps differ substantially in how they arrive at the gram count for each macro, and those differences translate directly into whether you stay in ketosis.

The three key calculation decisions are: how the app derives net carbs (total carbs minus fibre, minus sugar alcohols, or neither), how it sources macro data (verified database versus crowdsourced), and how it handles portion estimation for logged foods.

How do the major free keto trackers compare on calculation method?

App	Net Carb Formula	Sugar Alcohol Handling	Database Source	Custom Gram Targets (Free)
Carb Manager	Total - fibre - sugar alcohols	Subtracted by default	Crowdsourced + verified	Partial (percentages weighted)
Cronometer	Total - fibre	Manual	Verified (USDA, NCCDB)	Yes (grams)
MyFitnessPal	Total only	Not separated	Crowdsourced	No (premium)
FatSecret	Total only (manual subtract)	Manual	Crowdsourced	Yes (grams)
Senza	Total - fibre	Partial	Crowdsourced	Limited
Nutrola (trial)	Total - fibre - sugar alcohols (adjustable)	Fully configurable	Verified (1.8M+)	Yes (grams and percentages)

A keto user running strict 20g net carbs on MyFitnessPal free is effectively doing math in their head on every meal, because the app does not surface net carbs. A keto user on Carb Manager free gets the net-carb calculation for free but gives up precise gram-level macro targeting. Cronometer and Nutrola sit closest to the ideal: accurate database plus gram-level targets.

Do free apps warn about protein over-consumption?

Protein over-consumption is the single most common reason keto users fail to produce ketones. Excess protein beyond what the body needs for tissue maintenance can be converted to glucose through gluconeogenesis, raising blood sugar and suppressing ketosis. A keto tracker that only caps carbs and treats protein as unlimited is missing a core part of the diet.

Most free apps do not surface protein ceilings at all. Nutrola's free trial lets you set an upper and lower protein bound in grams per kilogram of lean body mass, displays a warning when a planned meal pushes you above the ceiling, and shows cumulative protein against target in real time — behaviour that typically requires a paid tier elsewhere.

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How Does Nutrola's Free Trial Serve Keto Macro Tracking?

What keto-specific macro features does Nutrola's free trial include?

Nutrola's free trial provides full ketogenic macro precision during the trial window:

• Fully adjustable 70/20/10 macro targets: Set fat, protein, and carbs as percentages of calories, absolute grams per day, or both at once. Save custom presets for standard keto, targeted keto around workouts, cyclical keto refeed days, and therapeutic high-fat ratios.
• Net carbs as a first-class number: Total carbs, fibre, and sugar alcohols displayed separately on every food. Net carb calculation is configurable — subtract fibre only, fibre plus sugar alcohols, or a custom rule per ingredient.
• Protein ceiling alerts: Set an upper protein bound and receive a warning before logging a meal that would push you into gluconeogenesis risk.
• Macro rings and gram counters side by side: The daily dashboard shows three macro rings (fat, protein, carbs) with percentage split, plus a live gram counter showing grams eaten and grams remaining for each macro.
• Standard, targeted, and cyclical keto presets: Switch between keto variants without rebuilding your profile. Daily targets adjust accordingly, including carb-cycling schedules.
• Verified 1.8 million+ food database: Every entry reviewed by nutrition professionals, which matters more on a 20g net-carb ceiling than on any other diet.
• 100+ nutrients tracked: Electrolytes (sodium, potassium, magnesium) are especially relevant on keto and appear alongside macros, not as paywalled micronutrients.
• AI photo logging in under 3 seconds: Snap a photo of your plate; the AI identifies foods, estimates portions, and logs gram-accurate macros including fibre and sugar alcohols.
• Voice logging in natural language: Say "three eggs, two strips of bacon, and half an avocado" and Nutrola parses, looks up verified values, and logs the meal.
• Barcode scanning for keto-packaged goods: Fast scans pull the verified label including sugar alcohol breakdown for accurate net-carb calculation.
• Apple Watch and Wear OS complications: Keto users check macro rings constantly — Nutrola puts the rings on your wrist with native Apple Watch and Wear OS apps.
• 14 languages and zero ads on any tier: Full localization, and keto dashboards stay clean and uninterrupted even on the free tier.

Why does macro precision matter more than feature breadth on keto?

Every keto failure story starts with the same sentence: "I thought I was at 20 grams, but I was not." The culprit is almost always imprecise gram data — a crowdsourced entry off by a few grams of carb, a sugar alcohol counted when it should have been excluded, a sauce logged as an ingredient instead of a serving. The job of a keto macro tracker is to eliminate that class of error. Everything else is secondary.

Start free with Nutrola's trial — every keto macro feature unlocked at zero cost. If the gram-level precision keeps you in ketosis, €2.50/month after.

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Free Keto Macro Tracker Comparison Table

App	Truly Free?	Gram-Level Macros	Net Carbs (Free)	Keto Preset	Database	Ads
Carb Manager	Partial	Limited (percentages)	Yes	Low-carb default	Crowdsourced + verified	Yes
Cronometer	Partial	Yes	Yes (fibre only)	No dedicated preset	Verified (USDA/NCCDB)	Yes
MyFitnessPal	Partial	No (premium)	No	No	Crowdsourced	Heavy
FatSecret	Yes	Yes	Manual	No	Crowdsourced	Yes
Senza	Partial	Limited	Yes	Yes (single)	Crowdsourced	Yes
Nutrola (trial)	Free trial	Yes (grams and percentages)	Yes (configurable)	Standard, targeted, cyclical	Verified (1.8M+)	Never

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Which Free Keto Macro Tracker Should You Choose?

Best if you want net carbs front and centre

Carb Manager free. The cleanest net-carb UX in the category. Use it if your single biggest daily question is "how many net carbs do I have left" and you can live with limited 70/20/10 customisation on free.

Best if you need per-gram macro accuracy on a strict ceiling

Cronometer free. The verified database gives you the closest thing to lab-accurate gram counts among free options, which is exactly what a 20g net-carb ceiling demands. Set custom gram targets for a 70/20/10 split and accept a slightly data-dense interface.

Best if you want adjustable keto variants, AI logging, and watch support

Nutrola's free trial. Fully adjustable 70/20/10 targets, standard/targeted/cyclical presets, configurable net-carb formula, protein-ceiling alerts, verified 1.8 million+ database, AI photo and voice logging, Apple Watch and Wear OS, and zero ads. Every premium keto feature at zero cost during the trial. If the precision keeps you in ketosis, €2.50/month is the most affordable way to keep it.

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Frequently Asked Questions

What is the best free keto macro tracker?

For a net-carb-first UX, Carb Manager free is the strongest permanently free option. For the most accurate per-gram macro data, Cronometer free is best. For fully adjustable 70/20/10 targets, configurable net-carb rules, protein-ceiling alerts, and AI logging at no upfront cost, Nutrola's free trial delivers every premium keto feature.

Can I track net carbs for free?

Yes, but not equally well. Carb Manager and Senza show net carbs natively on free. Cronometer calculates net carbs as total minus fibre but does not fully separate sugar alcohols on free. MyFitnessPal and FatSecret free tiers do not display net carbs at all — you must subtract fibre manually. Nutrola's free trial lets you configure the net-carb formula per-food, including sugar alcohol handling.

Do free macro trackers support a 70/20/10 keto split?

Not uniformly. FatSecret free and Cronometer free allow custom gram targets that you can set to a 70/20/10 split. Carb Manager free limits full ratio customisation to premium. MyFitnessPal free locks macro targets behind premium entirely. Nutrola's free trial supports 70/20/10 with adjustable variants for targeted and cyclical keto.

Why do my macros not add up to my calorie goal?

Keto math uses 9 calories per gram of fat, 4 per gram of protein, and 4 per gram of carb. A 2,000-calorie 70/20/10 split is roughly 156g fat, 100g protein, 50g carb — and those grams, not percentages, are what actually produce ketones. Free apps that only display percentages without gram equivalents hide this relationship and make it easy to drift out of ketosis even when percentages look correct.

Does tracking protein matter on keto?

Yes. Excess protein beyond tissue-maintenance needs can be converted to glucose through gluconeogenesis, which suppresses ketosis. Keto users should set both a lower protein floor (to preserve muscle) and an upper ceiling. Most free apps only track protein as a single target number. Nutrola's free trial supports dual protein bounds and warns before a meal breaches the ceiling.

How much does Nutrola cost after the free trial?

Nutrola costs €2.50 per month after the free trial. This includes fully adjustable 70/20/10 targets, configurable net-carb formula, protein-ceiling alerts, standard/targeted/cyclical keto presets, the verified 1.8 million+ food database, AI photo and voice logging, barcode scanning, 100+ nutrients including electrolytes, Apple Watch and Wear OS apps, and 14 language support. No ads on any tier. Billing is through the App Store or Google Play.

Can I switch between standard, targeted, and cyclical keto in a single app?

Most free apps offer one generic keto preset, if any. Nutrola's free trial is built around variant switching — you can set daily schedules for targeted keto (extra carbs around workouts) and cyclical keto (weekly refeed days), and the tracker adjusts daily gram targets automatically rather than forcing you to rebuild your profile each time.

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Final Verdict

Keto is a gram-accurate diet, and the free macro tracker you choose should match that requirement. Carb Manager free offers the sharpest net-carb UX. Cronometer free offers the most accurate per-gram data. FatSecret free gives the most generous free macro depth with manual net-carb math, and Senza free delivers a keto-native interface with thinner controls. For fully adjustable 70/20/10 targets, configurable net-carb formulas, protein-ceiling alerts, AI photo and voice logging, a verified 1.8 million+ database, and zero ads on any tier — Nutrola's free trial is the only option that delivers every keto-critical feature at zero cost. Try it free, run your actual keto macros through a precision tool, and decide whether €2.50/month is worth keeping the gram-level accuracy that keeps you in ketosis.