Surge: Interval Timer & HIIT

Surge is a beautifully designed interval timer for HIIT, Tabata, boxing rounds, EMOM and any circuit-style workout — at home, in the gym or ringside. Pay once and it's yours forever. No subscriptions, no in-app purchases, no ads — every feature included. Set your work and rest, pick your rounds and press play — Surge calls every phase with beeps and haptics, so you train bell to bell without watching the clock. ROUNDS READY TO GO • Tabata — 20s work / 10s rest × 8 rounds • HIIT — 40s work / 20s rest × 10 rounds • Boxing — 3:00 rounds with 1:00 rest × 6 • EMOM — 60-second intervals × 10 • Stretch — 30s holds / 10s rest × 12 • Edit any built-in preset to match your training YOUR WORKOUT, YOUR RULES • Work from 5 seconds to 10 minutes, rest up to 5 minutes • 1–50 rounds, with an optional preparation countdown • Save up to 20 presets with custom names and icons • Skip a phase mid-workout; the screen stays awake to the final bell • A large, glanceable countdown with an animated progress ring BUILT RIGHT • Pay once, own it for life — the price you see is everything • No subscriptions, no in-app purchases, no upsells • No ads, ever • Megabytes, not gigabytes — no ad libraries, no analytics SDKs, nothing that isn't the app itself • No account and no data collection — your presets never leave your device • Designed for iPhone and iPad Download Surge and let every round run itself.