Workout routines,
perfected.
Build your own step-by-step workouts. Hit play. FitStack takes care of the timing, the transitions, and the voice cues — so you can focus on the reps.
Everything you need, nothing you don't
FitStack is built around six ideas. That's all it does — and it does them well.
Step-by-step routines
Sequence exercises, rest phases, and get-ready timers. Build routines exactly the way you train.
Voice coaching
Natural-sounding voices call out each step. System voices or Google Cloud Natural Voices — your choice.
Circular timers
A calm, focused visual rhythm. No cluttered screens. Just the next step, the current phase, and the time remaining.
Export, share, import
Share a routine with a friend or back up your entire library. Your routines are yours — always.
Multilingual
English, German, French, Spanish, Japanese. Voice and interface both switch with a tap.
Local-first
Your data lives on your device. Fast, private, and works offline. No account required.
Ready to stack your reps?
FitStack is currently in private TestFlight. Drop us a line if you'd like an invite or updates on the public release.
hello@repcraft.io