Checkfit vs StrongLifts 5x5.
StrongLifts runs one fixed program; Checkfit writes one that adapts. StrongLifts is a single beginner barbell routine. Checkfit is a hypertrophy mesocycle calibrated to you and built to keep working after linear progression dies.
What StrongLifts is
StrongLifts is one fixed program: five compound barbell lifts — squat, bench, row, overhead press, deadlift — with the simplest possible progression, add 5lb every session until you stall. There's a free tier and a paid Pro tier, but both run the same rigid linear routine. It's easy to follow, and Checkfit is too — the difference is that Checkfit keeps working once linear progression runs out.
Why lifters choose Checkfit
StrongLifts is one program, forever. The same five lifts, the same linear jumps, no accessories by default, and a barbell required. Linear progression works — until it doesn't, which for most lifters is within a few months. After that, "add 5lb every session" just means stalling on schedule.
Checkfit picks up where 5x5 leaves off. It calibrates a six-week hypertrophy mesocycle to your current strength, includes accessory work alongside the compounds, manages your volume, schedules deloads, and progresses with RIR-based math instead of a flat 5lb. It works with any equipment — barbell, dumbbells, machines, cables — not just a loaded bar.
And it covers the part 5x5 never touched: daily calorie and protein targets are built in, with an optional coach connection on top. StrongLifts teaches you to lift; Checkfit programs the muscle-building and the nutrition behind it.
Nutrition the others don't have
StrongLifts will tell you to eat big and leave it there. There's no calorie target, no protein goal, no food log — yet on 5x5 the recomposition lives and dies on whether you actually eat enough. Checkfit builds that into the same app: a daily calorie and protein target, and a logger to hit it. Search a food, add it, and the running total moves toward your number, so a bulk is a plan you can hold to and a cut is a deficit you can see.
Training and eating come in one subscription, not a free 5x5 app plus a separate macro tracker. See how nutrition works.
At a glance
| Checkfit | StrongLifts | |
|---|---|---|
| Program type | Adaptive 6-week mesocycle | Fixed 5x5 linear |
| Progression | RIR-based, calibrated | Add 5lb per session |
| Equipment | Any setup | Barbell required |
| Calorie & protein targets | Included | None |
| Food logging | Built in | None |
| Coach connection | Included | None |
| Auto weight progression | RIR-based, autoregulated | Linear — adds weight until you stall |
| What you pay for | $17/mo — training, nutrition & coaching, all in | One fixed program; buy macros & coach separately |
The verdict
Where they match, they match: both are simple to follow and both auto-add weight and track your lifts. Everywhere else Checkfit is ahead. StrongLifts runs one rigid linear routine on five barbell lifts and stops there; Checkfit calibrates an adaptive hypertrophy mesocycle to your strength, autoregulates from your RIR, covers every muscle and any equipment, manages volume and deloads, and builds in calorie and protein targets, food logging, and an optional coach — all in one $17/mo subscription. Free-but-fixed only ever gets you the one program. Get Checkfit.
Know exactly what
to do next.
Six-week programs, calibrated to you. Sign up in the app.
