Build your custom interval timer in under a second. Hold. Speak. Train. Nothing is faster.
The Difference
Other apps make you tap through menus, scroll through settings, and fiddle with numbers. RoundBoss doesn't.
Features
Speed is the starting point. Everything else you'd expect from a premium timer is built in.
Say anything natural. "Boxing 12 rounds" or "Tabata 8 sets 20 on 10 off." AI figures it out instantly.
Timestamp-based timer with 100ms accuracy. Prep, round, warning, and rest phases with distinct audio cues.
Presets for Boxing, MMA, HIIT, Tabata, and more. Tap once and go, or save your own custom templates.
17 sound themes from voice coaches to pure SFX. Wooden block, zen garden, military drill, arcade — pick your vibe.
Feel every phase change through your phone. Round starts pulse, warnings tap, rest periods breathe. Eyes-free training.
Six visual themes from Boss Mode to Deep Ocean to Ice Storm. Each with its own color palette and personality.
How It Works
The world's fastest way to start a custom interval timer.
One button. Center of the screen. Press and hold — voice recognition starts immediately.
Instant"5 rounds, 3 minutes each, 1 minute rest." Natural language. AI parses it in real time.
~2 secondsRelease the button. Review your setup, tap Start, and you're training. Or quick-start skips straight to the timer.
InstantExperience
Every screen, every interaction — engineered to get out of your way and let you train.
Download
Free to download. Voice setup in under one second. No ads, ever.