This Cronometer review looks at a nutrition tracking app built for people who want to know more than their calorie count. Cronometer logs food, exercise and body measurements like other trackers, but its focus is on vitamins, minerals and other nutrients, drawn from curated scientific databases rather than crowd-sourced entries. It runs on the web, iPhone and Android, with a free Basic account and a paid Gold upgrade. We have not used it for this review. The assessment draws on Cronometer's own feature, database and security pages, its app store listing, and published reviews from Healthline, Garage Gym Reviews and Fortune.

Our verdict on Cronometer

Cronometer is the strongest choice on our list for anyone who cares about micronutrients. Its database comes from named, lab-analysed sources, its free tier is unusually generous, and it shows up to 95 nutrients and compounds for every day you log. Independent reviewers agree it is one of the most detailed trackers available.

The same depth is its main drawback. The app is data-heavy, it gives you numbers rather than a plan, and it offers little coaching or accountability. If you want someone to tell you what to eat, or you want the quickest possible way to log meals, other apps are friendlier. If you want to see exactly what your diet contains, Cronometer is hard to beat.

What Cronometer is and who it is for

Cronometer describes itself on its homepage as science-backed nutrition tracking that covers macros, micros, exercise and health data. Alongside the consumer app, it offers Cronometer Pro for dietitians, nutritionists, trainers and other professionals, which is one reason it is widely used by people working with a practitioner.

It suits:

  • Detail-minded trackers who want to see vitamin and mineral intake, not just calories and macros.
  • People following a specific eating pattern, such as low carb, keto, vegetarian or vegan, who want targets that reflect it.
  • Anyone working with a dietitian or doctor who has asked them to keep an accurate food record.
  • Wearable owners who want food data alongside activity, sleep or glucose data in one place.

It suits less well people who want a structured diet programme, daily motivation, or the fastest logging possible with minimal detail.

Key features

A curated food database

Cronometer's database page says its nutrition data is sourced from lab-analysed data rather than crowd-sourced guesses, and lists more than ten sources including the NCC Food and Nutrient Database, the USDA's Standard Reference database, the Canadian Nutrient File, the UK's McCance and Widdowson composition tables, Irish, Dutch and Australian databases, and branded food data. User-submitted branded foods go through a verification process, and the company says it removes duplicates and outdated entries. This is the main reason reviewers rank it highly for accuracy.

Detailed nutrient tracking, free

The free account page says the Basic plan tracks calories and up to 95 nutrients and compounds, includes the entire food database, unlimited barcode scanning, custom meals and recipes, exercise and biometric logging, and device syncing. It is free for as long as you want and Cronometer says it will never force an upgrade. The main limits are ads, a seven-day view of nutrition data and only basic charts.

Targets for different diets

Cronometer lets you set macro and nutrient targets for specific eating patterns. Healthline singled this out, naming Cronometer its pick for specific diets because recommendations change with the pattern you choose.

Device and app integrations

According to the integrations page, Cronometer syncs with Apple Health and Apple Watch, Android Health Connect and Samsung Health, plus Fitbit, Garmin, WHOOP, Oura, Dexcom, Polar, Withings, Suunto and Keto-Mojo. It can import exercise, heart rate, sleep, recovery and other measurements, so you can see food data next to the rest of your health data.

Faster logging tools

Photo and voice logging use AI to recognise what you ate, and Cronometer's photo and voice page stresses that the nutrition values still come from its scientific databases rather than AI estimates. These tools are part of Gold.

Plans and pricing structure

Our page shows current prices from our own data, so here is the structure. Cronometer has a free Basic plan and a paid Gold subscription billed monthly or yearly, with yearly working out cheaper. The Gold page lists what the upgrade adds: no ads, unlimited history, custom charts, nutrition scores, photo and voice logging, an in-app assistant called Crono Coach, a recipe importer, repeat items, a macro scheduler for different days, a fasting timer, a nutrient search that suggests foods high in nutrients you lack, and custom biometrics. Professionals use the separate Cronometer Pro service.

For many people the free tier is enough to learn how their diet looks. Gold earns its keep if you want long-term history, faster logging or the nutrient suggestion tool.

Is Cronometer safe and private?

Health data is sensitive, so privacy matters. Cronometer's data security page says it never sells personal data to third parties, runs regular vulnerability scans and disaster recovery drills, uses multiple cloud regions, and complies with HIPAA, GDPR and CCPA requirements. It also says you can export or delete all your data at any time. Its AI logging page adds that it does not share personally identifiable information with the AI tools it uses. These are company statements rather than independent audits, but they are clearer than many food trackers manage.

How to get accurate results from Cronometer

A detailed database only helps if the entries you log are right, so a few habits make a big difference. Use a kitchen scale for a week or two, at least for the foods you eat most often, so you learn what a portion really looks like. Build your regular home-cooked dishes as custom recipes once, then log them with a tap rather than estimating each ingredient every time. When you search, prefer entries from the scientific sources Cronometer labels over vague generic ones. Scan barcodes for packaged foods. Set your diet pattern and targets at the start so the nutrient bars mean something. Finally, look at weekly averages rather than single days, because one day's vitamin total says little on its own.

What could be better

  • It can feel overwhelming. Reviewers describe dense menus and a lot of numbers on screen, which can put off casual users.
  • No plan or coaching. Cronometer shows what you ate, not what to eat. There is no structured programme or accountability system in the core app.
  • Accuracy still depends on you. Mixed meals and estimated portions reduce accuracy, however good the database.
  • Short free history. The free plan shows seven days of nutrition data, so trend analysis needs Gold.
  • Ads on the free plan. They are removed only with Gold.

Who should choose something else

If you want a guided weight programme with lessons and coaching, a habit-focused app will suit you better. If you only want calories and macros with the quickest logging, a simpler tracker may feel lighter to use. And if detailed food tracking has ever made you anxious or affected your relationship with food, a tracker of any kind may not help. The National Institute of Mental Health describes eating disorders as serious conditions that need professional treatment, and Garage Gym Reviews also advises against detailed trackers for people with a history of disordered eating. Speak to a doctor or registered dietitian before changing your diet for a health condition.

Is Cronometer worth it?

Yes, if accuracy and detail are what you want. Start with the free Basic account, log honestly for a week or two, and see whether the nutrient breakdown changes how you eat. Upgrade to Gold if you want longer history, faster logging or nutrient suggestions. Cronometer will not motivate you or plan your meals, but as a precise record of what you eat, it is among the best available.

What other reviewers found

  • Healthline named Cronometer its best calorie counter for specific diets, pointing to diet-specific targets and its usefulness for tracking vitamins and minerals.
  • Garage Gym Reviews, using a registered dietitian among its reviewers, rated it highly for detailed data and community, gave it a lower mark for accuracy because mixed meals still need estimating, and said its tester sometimes felt overwhelmed by how much it tracks.
  • Fortune found it easy to use with a lot of functionality on the free plan, including barcode scanning, but noted that it offers no diet or exercise plans and no accountability features.
  • On the App Store, Cronometer holds a very high average rating from tens of thousands of user ratings.

Where the sources agree: Cronometer leads on nutrient detail, its database is more trustworthy than crowd-sourced alternatives, and its free tier is generous. Where they differ is on ease of use. Fortune found it simple once logging became a habit, while Garage Gym Reviews found the volume of data overwhelming at times. For a buyer, that suggests a short learning curve that most people get past, with the payoff being better data than most competitors offer. Nobody claims it will tell you what to do with that data, so pair it with professional advice if you have a specific health goal.

Frequently asked questions

Is Cronometer free?

Yes. Cronometer's Basic account is free with no time limit and includes the full food database, tracking of up to 95 nutrients and compounds, unlimited barcode scanning, custom recipes, exercise logging and device syncing. It shows ads and keeps a seven-day view of nutrition data. The paid Gold plan removes ads and adds unlimited history and extra tools such as photo logging.

Is Cronometer more accurate than other calorie counters?

Its database is built from named scientific sources such as the USDA and NCC databases, and user-submitted branded foods are verified before being added, so entries tend to be more reliable than crowd-sourced alternatives. Reviewers rate it among the most accurate apps. Your results still depend on weighing or estimating portions carefully, especially for mixed home-cooked meals.

Does Cronometer work with Apple Watch, Fitbit or Garmin?

Yes. Cronometer says it syncs with Apple Health and Apple Watch, Android Health Connect, Samsung Health, Fitbit, Garmin, WHOOP, Oura, Dexcom, Polar, Withings, Suunto and Keto-Mojo. It can import exercise, heart rate, sleep, recovery and other measurements, which lets you view your food log alongside activity and other health data in a single app.

Is Cronometer good for weight loss?

Cronometer can track calories and macros for weight goals, but it does not provide a weight loss programme, coaching or motivation. Reviewers note it lacks accountability features. It suits people who already know their plan and want accurate records. For weight loss tied to a health condition, speak with a doctor or registered dietitian about targets before you start tracking.

Does Cronometer sell my data?

Cronometer says it never sells personal data to third parties and does not share personally identifiable information with the AI tools behind its photo and voice logging. It states compliance with HIPAA, GDPR and CCPA and lets you export or delete your data at any time. These are company statements, so read the privacy policy if you have specific concerns.

Sources