Checkfit vs Strong.
Both Strong and Checkfit run on iPhone. Both are aimed at people who train with weights. They're doing genuinely different jobs, and the right choice depends on what you actually need.
What Strong does well
Strong is one of the cleanest lifting loggers on iOS. The interface is fast, the exercise database is broad, the rest timer is reliable, and the freemium model means most lifters can use it for free indefinitely. If you already know what you're doing in the gym — your program is set, your weights are picked, your progression is figured out — Strong is an excellent place to record the work.
Where Checkfit is different
Strong is a logger. It assumes you bring the program. Checkfit writes the program. Checkfit calibrates the first session to your current strength, picks the weight for every set, schedules deloads at the end of each six-week block, and adjusts the next session based on the reps in reserve you reported on the last one. You don't decide what weight to use. You don't decide when to add load. You don't decide when to back off. The app does, and the math behind those decisions is the whole product.
At a glance
| Checkfit | Strong | |
|---|---|---|
| Programming | Six-week mesocycles, automatic | You bring your own |
| Weight selection | Calculated each session | You enter manually |
| Progression | Automatic, RIR-based | Manual |
| Free trial | 7 days | Free tier available |
| Price | $20/mo | Free or $4.99/mo Pro |
Which one is for you
If you already have a program and you want a great place to record it, the other app is a fine choice — possibly better. If you don't have a program, or the program you have stopped working, that's the gap Checkfit is built to fill.
