Build your custom interval timer in under a second. Hold. Speak. Train. Nothing is faster.
Your corner, in your pocket
Set it down, call it out, and go. RoundBoss runs the round while you keep your hands up - precise audio cues, an escalating final-ten countdown, and zero fumbling with your phone.
Download FreeThe Difference
Other apps make you tap through menus, scroll settings, and fiddle with numbers. RoundBoss does not.
Features
Speed is the starting point. Everything else you 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.
Premium sound themes from voice coaches to pure SFX, plus an escalating final-seconds countdown. Pick your vibe.
Feel every phase change. Round starts pulse, warnings tap, rests breathe. Eyes-free training.
Record yourself and pin a note to any phase. RoundBoss plays your call at the exact moment - "empty the tank" right as the last round begins.
Use Cases
Boxing, HIIT, mobility, breathwork - if it runs on intervals, it runs on RoundBoss.
Boxing
Shadow Boxing
Conditioning
Mobility
BreathworkHow 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, tap Start, and you are training. Or quick-start 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.