Cronometer is the gold standard for serious nutrition tracking. While apps like MyFitnessPal rely heavily on user-submitted food data, Cronometer sources from verified databases like NCCDB and USDA, resulting in far more accurate and complete nutritional information. Tracking over 80 nutrients -- including individual amino acids, fatty acids, vitamins, and minerals -- gives health-conscious users a level of detail that no competitor matches. Support for specialized diets like keto, vegan, and paleo with custom macro targets shows thoughtful design for its target audience. The interface is information-dense but well-organized. As a fitness app, Cronometer is limited to calorie and activity tracking through device integrations rather than offering workout programming or exercise guidance. The health tracking scope is solid but nutrition-focused rather than comprehensive. The free tier is functional, and Gold adds useful features like fasting timers. For anyone who takes nutrition seriously, Cronometer is the clear choice.