GainBook

GainBook is a local-first workout tracker for iOS and Android. Users log sets live during a workout, with supersets, a rest timer and heart rate in one place, and build workout templates with warm-ups, supersets and per-set rest. Plans are scheduled by weekday, with the next workout marked.

A library of nearly 900 exercises includes photos, instructions and the user's own history, and can be searched and filtered by muscle or equipment. Every session is broken down by volume and by where it landed on the body, and progress is shown over weeks and months with volume, streaks and best lifts. Training history is also available as a calendar, one tap from any session.

All data is stored on the device: no account is required and nothing is synced to a cloud. The app is available on Google Play and the App Store.