Iron Log

Iron Log is a local-first Android app that runs one job well: it enforces a fully algorithmic strength progression. You log the reps you actually hit; the app hands you your next target. There is no RPE slider to guess at and no spreadsheet to maintain. Log a set, and it sets your next number.

Everything stays on the phone. No account, no sign-up, no cloud sync; your training history lives in local storage on the device and nowhere else, so the app works offline and keeps working whether or not any server is around. It's an open source workout tracker for Android with no subscription and no telemetry.

It's built for focused sessions: four sets per exercise, about 90 seconds of rest, and a four-exercise session that runs roughly 45 minutes by design.

How progression works

Reps climb inside a fixed 6-10 range. Clear 10 and the weight steps up about 5-10% while the target drops back to 6, a built-in functional deload. Each cycle sits on a heavier baseline than the last.