Where they differ
Hevy is a workout logging app. You build or import routines, log sets and reps as you train, and Hevy tracks your history, personal records, and volume over time. It has a well-liked social feed where you can follow other lifters and see their workouts, and a library of templates to start from. What Hevy doesn't do is decide your workout for you — you or someone else (a coach, a template, a program you followed online) has to set the sets, reps, and progression scheme.
FlexFit starts from the other direction: it generates your workout each session based on your program's current week, what you logged last time, how hard it felt, and how much time you have today. You stay in charge: every generated session is editable, you can set your own split, or build a workout from scratch — FlexFit just handles the progression math you'd otherwise do by hand. FlexFit also tracks food and macros (by text or photo) and body weight in the same app, alongside training. Hevy focuses on training logs and doesn't do food tracking.
Both work well without a gym — you can log any equipment setup in Hevy, and FlexFit will generate workouts around whatever equipment you tell it you have, with a one-tap switch between home and gym profiles.
Who should pick Hevy
If you already have a program you like — your own, a coach's, or one you found online — and you just want a clean, fast way to log it, see your history, and check PRs, Hevy does that well. The social feed is a real feature if you like following friends or other lifters and seeing what they're doing. Hevy is a mature, widely used logger with a strong reputation for that specific job.
Who should pick FlexFit
If you don't want to plan your own progression — or you want a second opinion on it — FlexFit is built for that. It adjusts week to week based on what you actually did last session, works whether you're a beginner wanting a guided setup or an experienced lifter who wants to set your own split and let FlexFit handle the week-to-week adjustments, and folds in mobility work, food and macro tracking, and body weight tracking so you're not juggling three apps. Every FlexFit plan includes every feature — there's no tier to upgrade into for AI generation or tracking. And if you'd rather write your own program, FlexFit takes that too — generation is a default you can override, not a requirement.
Which one for you
Think of Hevy as the notebook and FlexFit as the coach who also keeps the notebook — and hands you the pen whenever you want it. If the social feed is the draw, go with Hevy. If you want programming handled (or simply available) alongside food and body tracking, go with FlexFit.