OpenBook

OpenArcX

In-app purchases

About this app

OpenBook is a clean, pen-and-paper style workout log.

Built to be fast, simple, and flexible.

No sign-up, no credit card required — start right away with unlimited exercises and routines, full graph access, and CSV export for your own data.
Log up to 28 training days. Subscribe anytime for unlimited logging.

With OpenBook, you can:

Log any exercise. Track any unit or combination of units.
However you train — strength, calisthenics, bodybuilding, powerlifting, yoga, or functional fitness — OpenBook fits around it.

For example:
• Bench Press — weight × reps
• Zercher Hold — weight × time
• Sled Push — weight × distance
• Planche Lean — distance × time
• Dead Hang — time only
• Stretching — time only
• Arrowhead Lunge — breaths

Swipe between days
Move between days with a simple swipe to review past sessions.

See your training at a glance
View your days across a calendar or heatmap.

Plan or track anytime
Start with a saved routine or log as you go.

Time your rest. Add notes.
Set custom rest timers and add notes for each session.

View your progress with context
Track your progress over time, including intensity through % max or %1RM.

Compare and periodize
Track two metrics on one timeline to support structured, periodised training.

Edit or repeat sessions
Quickly update past logs or duplicate sessions with a single tap.

Download your data
Export your data at any time.

Back up your data to the cloud
Keep your data safe and accessible.