Train
with intent.
The strength app
that picks your weights.
Six-week programs, calibrated to your last session. Just confirm and lift.
$15/mo · 7-day free trial
The strength app
that picks your weights.
Six-week programs, calibrated to your last session. Just confirm and lift.
$15/mo · 7-day free trial
Programs work because data compounds. Every set you log makes the next one smarter.
Founder data — 6 weeks of beta testing.
Where you are this week.
Weights pre-filled. Tap to confirm.
One slider per set. RIR captured.
Strength curves over time.
Six weeks of strength, adjusted to your last session.
Calculated from your RIR and history. Just confirm and lift.
Sets in seconds. The session moves itself forward.
An adaptive strength training app for iPhone. It writes your program, calculates your weights, and tracks every set you log.
Intermediate-to-advanced lifters who want intelligent programming without hiring a coach. If you've trained for six months or more and want to actually progress, Checkfit is for you.
From your performance history and RIR (Reps in Reserve) targets. You confirm; the math is done.
Works with a full gym, home dumbbells, or bodyweight. Tell Checkfit your equipment and it adjusts.
Yes. The programming logic responds to your strength and recovery, not your gender.
Those are loggers — you write the program, they record it. Checkfit writes the program and picks the weights. You just lift.
Yes. Cancel anytime; you keep access until your renewal date.
Yes — 7 days free on every plan. Cancel anytime before it ends.
Try Checkfit free for 7 days. Cancel anytime.
Billed monthly $120 billed annually · 2 months free
7-day free trial. Cancel anytime. Built for iPhone first — Android coming.
Train with intent. Starting today.