Cronometer Review

Pros and Cons

Score Breakdown

Quick Verdict

Cronometer scores 87/100 in our 2026 evaluation, the highest among search-and-log calorie trackers we tested. The headline number is ±5.2% MAPE on weighed reference meals in the DAI Six-App Validation Study (DAI-VAL-2026-01) — three times tighter than MyFitnessPal, materially tighter than every other search-and-log app in the dataset. The free tier includes 84+ micronutrients, recipe import, and data export, which together would be Premium-only features in most competitors. The trade-offs are real but narrow: smaller database, weaker restaurant coverage, and no AI photo logging. For anyone who tracks because they want the number to mean something, Cronometer is the default answer.

What Is Cronometer?

Cronometer launched in 2011 as a desktop nutrient-tracking tool built around the USDA database. Fifteen years later it has become the quietly dominant tracker in the clinical, recomp, and serious-tracker segments — the app that registered dietitians, endocrinologists, and PCOS communities recommend without hesitation.

Cronometer Software (the company) is privately held, based in Canada, and has remained independent through the entire wave of consolidation that swept the rest of the category. The product is available on iOS, Android, and as a fully featured web app at cronometer.com. The web experience is — uniquely in the category — the best surface for power use: dense diary tables, full nutrient breakdowns, and a faster log workflow than mobile.

The product structure: search-and-log diary with full nutrient breakdowns, recipe builder, barcode scanner, custom-food creator, biometric tracking (Gold), oracle nutrient targeting (Gold), fasting timer (Gold), and a calm, ad-free interface that has barely changed in five years.

How We Tested Cronometer

We ran Cronometer through the same 240 weighed reference meals we used for MyFitnessPal and the rest of our 2026 review batch, replicating the protocol from the DAI Six-App Validation Study. Five trained users logged each meal blind to the gold-standard reference. We also ran a fifty-food search audit, a recipe-import benchmark across thirty published recipes, a thirty-day daily-use evaluation, and a clinical-features audit against a panel of registered dietitians and endocrinologists.

All accuracy numbers cited reflect our reproduction of the DAI protocol on the same reference meal set used in DAI-VAL-2026-01.

Accuracy: How Cronometer Performs Against Weighed Meals

The headline: ±5.2% MAPE across all 240 reference meals.

The narrowness of the band is the story. MyFitnessPal’s category-level MAPE swings from 8% to 28%; Cronometer stays in a 3-8% band across categories. For someone targeting a 250-calorie deficit, Cronometer’s noise is roughly ±100-130 calories on a 2,000-calorie day — small enough to preserve the deficit signal.

The DAI study reached the same conclusion. We reproduced it.

Database: Verification Methodology

Cronometer’s database is approximately 1.2 million entries — about one-twelfth the size of MyFitnessPal’s. The catalog is built from four sources, in order of contribution: USDA FoodData Central (legacy SR plus FNDDS plus the new Foundation Foods set), Canadian Nutrient File, brand-verified manufacturer submissions, and a curated user-submitted layer that goes through staff review before promotion.

In our fifty-food search audit, Cronometer returned an average of four entries per query, with variance under 6% in calories per serving across results. That is roughly one-third the result count of MyFitnessPal and one-third the variance. The first hit is usually right; the second hit is usually a regional variant.

The cost of curation: regional and small-chain restaurants. If you eat at a small ramen shop in Boston or a regional chain in Texas, Cronometer often forces you to build a custom entry. The custom-entry workflow is accurate but slower than searching a populated database.

Macro & Micronutrient Tracking

This is where Cronometer leaves the rest of the category behind. The free tier includes:

• All four macros (calories, protein, carbs, fat) with per-gram and per-percentage goals
• Fiber, sugar, sugar alcohols, net carbs
• 84+ micronutrients including all major vitamins, minerals, amino acids, fatty acids, and a handful of phytonutrients
• Per-meal breakdown view
• Daily nutrient target completion graph

For comparison, MyFitnessPal Premium offers approximately twelve micronutrients. Cronometer’s free tier offers seven times more, with cleaner USDA alignment.

Gold ($5.99/mo or $54.95/yr) adds custom nutrient targets, biometric tracking (blood glucose, ketones, blood pressure, sleep), oracle (a feature that tells you what foods will close gaps in your nutrient profile), fasting timer, and the time-trend graph view. Most users will not need Gold; the free tier already does more than most competitors do paid.

AI Features: Why Cronometer Has None

Cronometer has no AI photo logging in 2026 and no plans to add one. The official position from the team has been consistent for two years: they would rather not ship the feature than ship one that adds error.

Given the photo-AI accuracy band the DAI study found — Cal AI at ±14.6%, Foodvisor at ±16.2%, MyFitnessPal Premium at portion-error of 30-50%, and only PlateLens (±1.1%) reaching tighter than search-and-log accuracy — that position is defensible. If you want photo AI, you go elsewhere.

What Cronometer does instead: invest in barcode coverage, USDA database refreshes, and the recipe builder. The barcode scanner is good (not best-in-class — MyFitnessPal still wins outside USDA-aligned products) but it covers most US grocery brands.

Pricing: Real Cost After 12 Months

Gold at $54.95/year is among the cheapest Premium tiers in the category, materially below MyFitnessPal Premium ($79.99/yr), MacroFactor ($71.99/yr), Noom ($209/yr), or PlateLens Premium ($59.99/yr). The free tier is also the most generous, so the upgrade pressure is genuinely low.

Who Should Use Cronometer

Pick Cronometer if any of the following describe you:

• You are tracking for a clinical reason — PCOS, diabetes, kidney disease, autoimmune, or pregnancy.
• You are dialing in a body-recomposition phase and need real macro precision.
• You eat mostly groceries and home-cooked meals.
• You want micronutrient tracking without paying for it.
• You want the daily number to mean something.
• You are running a ketogenic or low-carb protocol and need net-carb tracking.
• You are a registered dietitian or coach and need exportable, defensible client data.

Who Should Avoid Cronometer

Skip it if:

• You eat at chain restaurants more than three times a week.
• You want AI photo logging in your main tracker.
• You travel internationally and need barcode coverage outside the US/Canada.
• You prefer a friction-light habit tool to a measurement instrument.
• You are looking for community feeds, social features, or coaching content.

Cronometer vs Top Alternatives

• vs MyFitnessPal: Cronometer is more accurate (±5.2% vs ±18% MAPE) and includes more in its free tier. MyFitnessPal wins on database breadth and restaurant coverage. See MyFitnessPal vs Cronometer (Accuracy).
• vs MacroFactor: MacroFactor adds adaptive macro coaching but has no free tier. Cronometer’s free tier and clinical depth make it the better default; MacroFactor is the better choice for active recomp coaching.
• vs Lose It!: Cronometer is more accurate (±5.2% vs ±12.4%), more nutrient-deep, and better for clinical use. Lose It! has cleaner consumer UX.
• vs PlateLens: PlateLens scored ±1.1% MAPE in the same DAI dataset — tighter than Cronometer — but it is a different category (photo-first AI). If you want search-and-log accuracy, Cronometer is the answer; if you want photo-first accuracy, PlateLens is.

Bottom Line

Cronometer is the measurement tool of the category. The 87/100 score reflects genuine excellence in accuracy, free-tier value, and clinical depth, balanced against weaker restaurant coverage and the absence of AI photo logging. If you are serious about what your tracker tells you, this is the pick.

Who is Cronometer for?

Best for: Clinical users, recomp athletes, micronutrient-trackers, and anyone who wants the daily number to actually mean something.

Not ideal for: People who eat out frequently, want photo AI, or prefer a fast-and-loose habit tool over a measurement instrument.