Burst - Smart Interval Timer

Burst is the interval timer built for people who actually train.
It's the only timer with TRUE random beeps — unpredictable cues that hit when you least expect them. Choose the duration, choose how many beeps, and the engine spreads them randomly through your round. No pattern, no anticipation. Just react.
RANDOM BEEPS — THE FEATURE NO OTHER TIMER GETS RIGHT
- Boxing & combat sports: shadowbox to unpredictable attack cues
- Agility drills: change direction the second the beep hits
- Conditioning: break the rhythm — your body never settles into a pattern
- Reaction training: real stimulus-response work for sport prep
BUILT DIFFERENT
- Smart intervals: work/rest, rounds, optional exercise labels
- Pyramids: auto-increasing intervals (10s - 20s - 30s - 40s...)
- Distance reps: 100m × 10, manual lap stop with split times
- Tabata, HIIT, AMRAP, EMOM-friendly templates
- Official fitness tests with officially paced audio cues: Beep Test, Luc-Léger, Yo-Yo IR1 & IR2, Cooper, demi-Cooper, 2 km, 30-15 IFT, Gacon 45/15, T-Test, FTP cycling, RSA
AUDIO CUES THAT WORK
- Distinct sounds for start, transition, 3-second warning, cue, end
- Volume boost up to 3× system max — perfect for outdoor sessions or Bluetooth speakers
- Plays alongside Spotify, podcasts, music apps — no conflict
- Vibrations option for silent training
EVERYTHING YOU NEED
- 50+ ready-to-use presets across 5 categories: Endurance, CrossFit, Combat, Tests, Mobility
- Custom timer builder: simple intervals, pyramids, random cues, distance, fitness tests
- Favorites tab — one tap to restart your regular sessions
- Session history with effort tracking, notes, and VMA / palier progression
- Clean interface, readable even mid-exhaustion
- Persistent notification: your timer stays alive on a locked screen
- Bilingual: English & French
MADE FOR
Boxing, kickboxing, MMA, Muay Thai, BJJ, CrossFit, functional fitness, running intervals, track and field, agility prep for team sports (football, basketball, rugby), lab-grade fitness testing.
NO FRICTION
- No mandatory account
- No email signup
- No paywall on core features
- No ads during your session — only between
- No bloat, no 50 useless buttons
Set it up once, save it as a favorite, and next session you're one tap away from go.
The rest is on you.