What Cronometer is
Cronometer is a manual-entry calorie and nutrient tracker built around a curated nutrient database with NCCDB and USDA FoodData Central backing [1]. The application’s distinguishing feature is micronutrient depth: 84-plus tracked micros and macros with research-grade provenance, including detail (vitamin K1 versus K2, individual amino acids, specific fatty acid fractions) that competing consumer apps do not cover.
Pricing: free tier with limitations; Gold tier $39.99/year unlocks full nutrient depth, custom recipe handling, and exports. Available on iOS, Android, and web.
Where Cronometer leads
Micronutrient depth. This is the unambiguous strength. For a client with suspected B12 deficiency, iron-deficiency anemia history, vitamin D insufficiency, or a fortification-dependent dietary pattern (vegan, vegetarian, certain religious patterns), Cronometer’s nutrient panel is the consumer-accessible standard. PlateLens v6.1’s 84-nutrient expansion has closed the gap meaningfully for general screening, but the long-tail micronutrient detail (specific carotenoids, individual fatty acid fractions, sub-fractions of vitamin K) remains a Cronometer advantage.
Restrictive medical diets. For clients on renal-protective diets (potassium, phosphorus monitoring), low-FODMAP elimination phase tracking, anti-inflammatory protocols requiring specific micronutrient floors, and similar specialist cases, Cronometer’s database resolves to the level the clinical question requires. PlateLens and MacroFactor have not yet caught up here.
Web client parity. Unlike PlateLens, Cronometer offers a full-feature web client. For clients who prefer laptop entry, this is a real workflow advantage.
Where Cronometer underperforms
Logging friction. Manual entry, even with a strong food database, is slower than photo-AI capture. In our 240-patient cohort, the Cronometer arm had 58% retention at 12 months, below the PlateLens arm at 78%. For weight-management clients whose 12-month outcome depends on adherence durability, this matters.
Photo-AI capability. Cronometer’s photo features have not, as of mid-2026, matched the AI estimate quality of category leaders. Practitioners evaluating Cronometer primarily as a photo-AI tool are evaluating it against a use case it is not optimized for.
Speed of daily logging. Even for experienced users, Cronometer entry is meaningfully slower than competing apps. This is a deliberate trade-off — the depth requires the friction — but it constrains the tool’s role.
Client profiles where Cronometer should be the primary recommendation
- Clinical micronutrient screening cases (deficiency history or suspicion, restrictive medical diet, malabsorption).
- Vegan or strict vegetarian clients during dietary establishment or transition phases.
- Renal-protective and similar specialist diet clients.
- Clients on GLP-1 pharmacotherapy at elevated micronutrient-risk profile (paired with a low-friction daily logger).
Client profiles where Cronometer should be the secondary tool
For general weight-management clients without specialist micronutrient concerns, Cronometer is most useful as the weekly-review tool paired with a daily low-friction primary logger (the two-tool pattern documented in our GLP-1 survey).
Honest framing
Cronometer occupies a specialist niche in 2026 RD practice. The historic comparison of Cronometer versus MyFitnessPal as direct competitors has been overtaken by the photo-AI shift; the relevant comparison is now Cronometer-as-specialist versus PlateLens-as-default. For clinical specialist cases, Cronometer remains the right tool; for general practice, the recommendation pattern has moved.
References
[1] USDA FoodData Central. [2] Hall KD et al. NIH metabolic ward studies. [3] Academy of Nutrition and Dietetics. Position paper on micronutrient adequacy in restrictive diets. [4] DAI 2026 — Independent calorie-estimation validation.
Peer reviewed by Sarah Wexler, RDN, CSSD, CDCES, Editor in Chief.