Round timer
Set work, rest, and round count. Bell on start, ten-second warning before the end, bell on rest. Defaults match standard boxing intervals — 12 × 3:00 with 60s rest.
— FREE IPHONE APP
Drill on
the bag.
Shadowbox
at home.
Boxerium calls your combos out loud while you box. Round timer, rest, ten-second warning, and a metronome — all built in.
- ROUND TIMER
- COMBO CALLOUTS
- CUSTOM WORKOUTS
Round timer. Combo callouts. Custom workouts.
Build a workout once. Run it forever. Bell on round start, ten-second warning before the end, spoken combos at whatever interval you set — never the same order twice.
What it does
Spoken combo callouts
Type any combo as plain text or build it from a list of techniques. The app speaks one of your combos out loud at the interval you set — random each time, so you don't memorize the order.
Custom workouts
Different rounds can have different combos, work times, and rest. Save your favorite workouts and start them with one tap. Share them with training partners via link.
Camera form coach
Prop the phone up and shadowbox. Boxerium watches you throw and picks up what a coach in your corner would — chin drifting up, hand dropping, leaving yourself open. At the end of the round it replays every instance and scores how you moved.
Campaign
Five chapters that each drill one part of your boxing — guard, output, stance, mechanics — scored out of three stars a level. Throwing hard is not enough; a guard that keeps dropping costs you a star.
Ranked fights & belts
Take on another fighter and you both run the same card. The coach scores each of you on output and technique, so nobody is self-reporting. Wins move your ELO from Bronze to Champion, and six continental belts sit above the ladder with one holder apiece.
— The full guide
Want the full picture?
Every feature explained — the running timer, spoken callouts, the rhythm-drilling tools, and how Campaign, ranked fights and the belts actually work.
Full feature breakdown— WHY I BUILT IT
Why I built this
I moved further away from my gym. What I missed wasn't the bag — it was a coach calling combos between rounds, and a workout that had a shape to it instead of me making it up as I went.
So that was the first thing: a workout builder, and callouts that tell you what to throw while you're throwing it.
Then I wanted the other half of a coach. Boxerium now watches you through the camera and picks up what someone in your corner would — chin drifting up, hand dropping, leaving yourself open to the counter. At the end of the round it replays every instance and scores how you actually moved.
Once a round had a score, a fight was the obvious next step. Two people run the same workout and get scored on output and technique, not on who says they won.
From there it became belts and an ELO ranking — the Pokémon Go of boxing, more or less. All of it for one reason: to make shadowboxing and bag work something you want to come back to.
Free to use. Premium clears the ads and makes energy unlimited; every timer feature is free either way. If something's annoying, tell me and I'll fix it.
— ETHAN
Free on iPhone.
No account needed. Just box.