Intertakt

A piano tuner works by ear. Strike two nearly identical strings and you hear a pulse between them — a beat you can count but never see — and the tuner walks that beat down to silence without once glancing at a dial. Intertakt brings that discipline to interval training. Your playlist keeps playing; a clear voice announces every HIIT, Tabata and EMOM interval, the halfway mark and each round, and countdown beeps sit over the music with a volume of their own — three channels sounding at once, every one distinct. Set the plan, tap start, and put the phone face-down: the session runs with the screen off until the last interval ends. Interruptions behave like a truck passing a tuner's window — the beat is still there when the rumble clears, and the workout resumes from the exact second it stopped. The free tier is unlimited: 0 ads, ∞ sessions, 0 accounts. Premium — custom plans, history, JSON export — is a one-time purchase, not a subscription. Built with Flutter, offline-first. Coming soon to Google Play; the waitlist and founding pricing are open at intertakt.com.