Burst - Smart Interval Timer

Burst is the interval timer built for athletes who actually train.
It's the only timer with TRUE random beeps — unpredictable cues that fire when you least expect them. Set the duration, set the number of cues, and let the engine spread them randomly through your round. No pattern, no anticipation. Just react.
🎯 Random Beeps — the feature no other timer does right
• Boxing & combat sports: shadowbox or hit the bag to unpredictable attack cues
• Agility: change direction the second the beep hits
• Conditioning: break the rhythm — your body never settles into a pattern
• Reaction training: real, scientific stimulus-response work
⚙️ Beyond random — every interval format you'll need
• Smart intervals — work/rest, rounds, optional exercise labels
• Pyramids — auto-progressive series (10-20-30-40s and back)
• Distance reps — 100m × 10, 400m × 6, manual lap stop with split times
• Tabata, HIIT, AMRAP, EMOM-friendly templates
Official fitness tests with paced audio cues:
• Cooper 12 min — VMA estimation
• Luc-Léger (Beep test) — official cadence
• Yo-Yo IR1 / IR2 — Bangsbo & Schmitz protocols
• 30-15 IFT — Buchheit VIFT calculation
• Gacon 45/15, T-Test, FTP cycling, RSA fatigue index
🔊 Audio that survives a real gym
• Distinct sounds: start, transition, 3-second warning, cue, end
• Volume boost up to 3× system max — perfect for outdoor or Bluetooth speaker
• Plays alongside Spotify, podcasts, music apps
• Vibrations option for silent training
✅ Built around your effort, not ad revenue
• Ads only show between sessions — never during training
• No mandatory account, no email signup
• No paywall on core features
• Clean, readable interface — still works when you're exhausted
• Wake lock + persistent notification: your timer stays alive even on locked screen
• English & French
🥊 Built for
• Boxing, kickboxing, MMA, Muay Thai, BJJ
• CrossFit & functional training (EMOM, AMRAP, circuits)
• Running intervals — track, hills, tempo, fartlek
• Team sport prep — football, basketball, rugby
• Lab-grade fitness testing
📦 What you get
• 50+ ready-to-use presets across Endurance, CrossFit, Combat, Tests, Mobility
• Custom timer builder — every mode editable
• Favorites — one-tap launch for your usual sessions
• Session history with perceived effort, notes, and VMA / palier tracking
🎯 The Burst philosophy
Most interval timers were built around one workout type, then bolted on the rest. Burst was built modular from day one — random, pyramid, intervals, distance, and tests share the same engine, the same sounds, the same simplicity. Set it up once, save as favorite, and next session you're one tap away from go.
No friction. No interruptions. Just train.
Download Burst — your training, your rules.