App Comparison

Cronometer vs Lifesum

Fuel Nutrition Team • March 16, 2026

Cronometer and Lifesum represent opposite philosophies in nutrition tracking. Cronometer obsesses over data accuracy — every entry verified, 80+ micronutrients tracked. Lifesum pivoted to AI convenience — describe your food in text, skip the database search. One gives you the most reliable numbers in the category; the other tries to make logging frictionless at the cost of accuracy.

Data Quality

Cronometer's USDA-backed database is its defining feature. Every entry is verified against institutional sources. It tracks 80+ micronutrients including full amino acid profiles, selenium, B12, and manganese. If you care about nutrition beyond calories and macros, no competitor comes close.

Lifesum's AI logging produces estimates from text descriptions, but accuracy is questioned by users. The ability to correct entries was removed in the AI update — a significant regression for data-conscious users. Micronutrient tracking is limited to basic macros.

Convenience vs Rigor

Lifesum's AI logging is faster. Type "chicken salad with avocado" and get estimates without database searching. It also offers diet plans, recipes, and a Life Score gamification system behind its subscription — more features for users who want lifestyle guidance.

Cronometer asks more of you: manual database search, precise portion selection, and an interface that prioritizes data density over friendliness. The Daily Report scroll-resets on every interaction, and there's no "remaining" macro view. But every number you see is trustworthy.

Stability

Lifesum's AI pivot introduced instability: the tracker breaks after updates, reverts behavior without explanation, and paid users report being unable to add foods.

Cronometer is more stable day to day, with reliability issues limited to Apple Health sync gaps rather than core tracking failures.

Verdict

If data accuracy and micronutrient depth matter, Cronometer at $5.49/month is the better tool by a wide margin — verified data, 80+ micronutrients, and no AI guesswork. If you want faster logging with diet plans and lifestyle features and can tolerate AI accuracy issues, Lifesum offers more surface-level convenience at $9.99/month.

Want verified-quality tracking with AI convenience and coaching? Fuel combines correctable AI logging with daily coaching and Apple ecosystem support — speed and accuracy without the trade-off.