Know what to lift next.

IronSage logs your sets, reads sleep and heart rate from Apple Health, and suggests the weight and reps for your next session, with the reason behind every change.

Coming soon to iPhone.

Bench press

Barbell, kg

Last time: 60 × 860 × 860 × 7
Today: 60 × 8, three sets. Hold the weight.

You slept 5 h 40 min and your HRV is 18% below your usual. The last set also fell one rep short, so stay at 60 kg and aim for 8 on every set.

Log a set in two taps

Every set starts with last time's weight and reps. Finish it and the rest timer starts, even with the phone locked. Works without signal.

See every lift move

Estimated one-rep max, personal records and weekly sets per muscle, for each machine and bar you use.

A coach that shows its work

Suggestions follow published training research and your own history, and each one says which numbers it used.