Tresha

Tresha is a simple offline strength training diary.

Features:
• Workout program by day of the cycle — the app automatically suggests which day is next
• Set history: weights, reps, progress
• Automatic load progression — weights are preset from the previous workout
• Rest timer between sets with an alarm, works even when the app is minimized
• Timed set timer — for planks, wall squats, and other holds
• Supersets
• Workout time is visible during the workout
• Ready-made programs for a quick start
• Backup: save data to a file and restore
• Dark theme
• All data is stored locally on the device

The app works completely offline, requires no registration, and does not collect your data.

The "Analytics" section is a subscription: personal records, progress for each exercise, bodyweight and relative strength graph. Everything else — the journal, program, timers — is free and unlimited.