INTER:VALS - Interval Timer

Interval training, dead simple. Open the app, tap Start, and you're training inside ten seconds — no account, no subscription, no ads. SPOKEN CUES, SCREEN LOCKED Lock your phone and pocket it. Spoken cues and beeps mark every work, rest, and halfway point through your whole session, with a Live Activity countdown on your lock screen and Dynamic Island. PROVEN PROTOCOLS OR YOUR OWN Beginner 1:2, Classic Tabata, and Norwegian 4×4 built in — or set your own work, rest, rounds, warmup, and cooldown, and save it. TRACK WHAT MATTERS • Live heart rate from Apple Watch during workouts • Optional GPS distance and pace for outdoor sessions • Sessions written to Apple Health, closing your rings • Streaks, weekly targets, and a 4-week consistency chart • PR detection — know when you beat your best • 12-minute Cooper test to estimate your VO₂ max PRIVATE BY DESIGN No cloud, no account, no analytics SDKs. Your health data never leaves your phone. One price. Everything included. Forever.