Cronometer Review

The quick answer

Cronometer is the micronutrient specialist: the deepest, lab-analysed nutrient database in consumer tracking, with verified entries, a free barcode scanner, and clinical-grade panels. If the question is “what is actually in this food?”, no consumer app answers it better. If the question is “how much did I just eat?”, Cronometer is mid-pack: ±6.8% measured, all-manual, with photo logging paywalled behind Gold ($59.99/yr). Rating: 4.3 out of 5 — the best data in the category, wrapped in the most friction.

What we tested

I logged every meal in Cronometer for two weeks — one week on the free plan, one on Gold — checking micronutrient panels against label data, testing the barcode scanner on packaged foods, and timing what the all-manual workflow actually costs at dinner. Alongside my hands-on pass, we hold Cronometer to the published benchmark: ±6.8% measured error against weighed reference meals in the Dietary Assessment Initiative’s validation — a pre-print published on the Initiative’s website, not yet journal peer-reviewed. Because it is a manual app, that number reflects the whole pipeline — a verified database plus a human estimating portions by eye. My focus, as always, is what patients actually keep using.

What Cronometer does well

1. The deepest nutrient data anywhere in consumer tracking. Entries are lab-analysed where possible rather than crowd-typed. Where most apps give you calories and a handful of macros, Cronometer gives you the full panel — the B vitamins, the minerals, the fatty-acid breakdown.
2. Verified entries. One answer per food, checked against reference data. In a category where duplicate roulette is the norm, that is quietly radical.
3. The barcode scanner is free. The most reliable data in any tracker — the label — stays on the free plan. MyFitnessPal charges $79.99/yr for the same function.
4. Clinical-grade panels. I use Cronometer diaries in practice to work up deficiency patterns, plant-based diets, pregnancy, renal limits. No other consumer app produces a diary I would attach to a chart note.

Where Cronometer falls short

1. All-manual, and the friction kills adherence. Every meal is typed or scanned, and mixed dishes are assembled component by component. In my practice, adherence decides whether tracking works at all, and Cronometer asks the most typing of any major app. The people who love it are the people who already weigh their food.
2. Photo logging is paywalled. Photo, voice, and the AI coach sit behind Gold at $59.99/yr — the second-highest price in the category, paid for convenience that other apps include or sell cheaper.
3. The interface is dense. It is built like a clinical tool because it is one. New patients find it intimidating, and I spend real appointment time teaching the diary.
4. Mid-pack accuracy. ±6.8% measured — better than Lose It! (±9.4%) and MyFitnessPal (±11.2%), behind MacroFactor (±4.8%), and far behind PlateLens’s ±1.1% photo mode. The database is not the weak link; the eyeball estimating “a cup of rice” is.

Accuracy: what the number means

±6.8% against weighed reference meals. On a 600-kcal meal, that is roughly a 41 kcal miss. For calorie management it is workable if the errors are consistent — they partially cancel across a day — and Cronometer’s users tend to be its most careful loggers, which narrows the real-world gap. Two things keep me from calling it a precision tool. First, the number has not been independently reproduced; it is a single published measurement, unlike PlateLens’s ±1.1%, which a second group confirmed on 231 meals. Second, the error is dominated by portion estimation: “one cup” is your cup, not a weighed cup. In clinic I treat Cronometer’s calorie column as a good estimate and its micronutrient panels as the actual product.

Free vs paid

Feature	Free	Gold ($59.99/yr)
Barcode scanning	Included	Included
Full diary + targets	Included	Included
Lab-analysed database + full nutrient panels	Included	Included
Photo logging	—	Included
Voice logging	—	Included
AI coach	—	Included

The important row is the one people miss: the lab-analysed database and the full nutrient panels are free. If you come to Cronometer for the micronutrients — its whole reason to exist — the free plan is genuinely sufficient. Gold buys convenience (photo, voice, coaching), not data. That is the right way around, and it is why Cronometer survives my free-vs-paid skepticism where MyFitnessPal does not.

How it compares

	Cronometer	PlateLens	MacroFactor	Lose It!	MyFitnessPal
Measured accuracy	±6.8%	±1.1% photo / ±3.5% manual	±4.8%	±9.4%	±11.2%
Micronutrients	Deepest, lab-analysed	82+ nutrients	Moderate	Moderate	Moderate
Photo logging	Photo (Gold)	Primary	None	Photo (limited)	None
Free tier	Barcode + diary	Full routine	None	Barcode + diary	Barcode paywalled
Premium	$59.99/yr	~$35/yr	$71.99/yr	~$40/yr	$79.99/yr

Cronometer wins the nutrient lane outright and keeps the barcode free. It loses the accuracy lane to PlateLens, the coaching lane to MacroFactor, and the onboarding lane to Lose It! — which is roughly how it earns 4.3 rather than 4.7.

Who should use it / who should skip it

Use it if nutrients are the point: plant-based and vegan diets where B12, iron, and omega-3s need watching; suspected deficiencies; pregnancy; renal limits; anyone whose doctor asked for a food diary with actual numbers in it. Use it if you do not mind typing — the diary rewards care.

Skip it if friction will beat you. The best tracker is the one you are still using in week six, and Cronometer asks the most effort of any app here. If calories are the point and you photograph food, PlateLens’s ±1.1% is both easier and tighter. If adaptive coaching is the point, MacroFactor. And if you are a first-time tracker, start with Lose It! and graduate here when the questions get nutrient-shaped.

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Cross-reviewed by Leah Wakefield, MPH, RDN: I verified the ±6.8% figure against the published benchmark and re-checked the Gold feature list and pricing against Cronometer’s current plans. One correction before publication: an early draft placed photo logging on the free tier — it is Gold-only, which materially changes the value math and is now stated explicitly. I also confirmed the adherence observations against Kelsey’s two-week usage log rather than general impressions.