App Comparison

Lifesum vs Noom

Fuel Nutrition Team • March 16, 2026

Lifesum and Noom are both trying to be more than basic calorie trackers — Lifesum through AI-powered logging, Noom through behavioral psychology. Both have compelling ideas. Both have execution problems that seriously undercut those ideas.

The Pitches

Lifesum pivoted to AI-powered food logging, replacing its previous structured meal-entry system. The idea: use AI to make logging faster and more intuitive. The execution: users describe the update as "fixing something that wasn't broken" — less accurate, less personal, and harder to trust.

Noom's pitch is behavioral coaching: change the psychology around food through science-based content and human coach access. The idea is intellectually coherent and backed by real research. The execution: the app frequently won't load, reinstalling resets your preferences, and customer service is unreachable.

Logging

Lifesum's AI logging is text-based but accuracy is questioned, and the ability to correct entries was removed in the AI update. Per-meal calorie breakdowns disappeared when meal structure was replaced with a flat list.

Noom's logging is basic manual search with no photo or voice capability. It can't copy meals between days and manual entries behave inconsistently. Logging feels like an afterthought to the coaching content.

Coaching

Noom wins here. Its psychology modules, daily lessons, and human coach access are genuinely valuable for users who engage with them. Lifesum offers diet plans and recipes behind its subscription, but nothing resembling a structured coaching program.

Reliability

Both apps have serious stability issues. Lifesum's AI tracker breaks after updates and reverts behavior without explanation. Paid users report being unable to add foods. Noom's app frequently won't open, and the recommended fix — reinstalling — resets all user preferences.

Neither app has an Apple Watch companion.

Pricing

Noom is among the most expensive apps in the category at roughly $70/month. Lifesum Premium is $9.99/month. The value proposition is different — Noom includes human coaching access — but the price gap is significant.

Verdict

If behavioral coaching matters most and you can afford $70/month (and tolerate the app issues), Noom's program has genuine depth. If you want a more affordable app-based approach with AI logging and diet plans, Lifesum is cheaper — but the AI pivot has eroded the daily experience.

Want AI logging that works reliably, with coaching built into the product — not bolted on top of a broken base? Fuel delivers correctable AI logging, daily and weekly coaching, and a stable Apple ecosystem experience.