Intertakt
Biathlon is interval training in its oldest form: a full-gas loop, then perfect stillness — five shots taken on a breath you have just talked down from a sprint. The clock is never in the athlete's hands. The rhythm alternates without asking anyone to check anything, and a missed shot adds a penalty loop — the race goes on. Intertakt carries that alternation into HIIT, Tabata, EMOM and custom plans. A voice over your music delivers the timing — work, rest, where you are in the plan — with beeps counting down to each change and independent volumes for voice, beeps and music. The screen can stay off; calls and app switches interrupt nothing, and the session resumes from the exact second it stopped. The free tier is unlimited: 0 ads, unlimited sessions, 0 accounts. Premium is a one-time purchase, never a subscription — unlimited custom plans, session history, JSON export. Android, offline-first, in pre-release: coming soon to Google Play; waitlist and founding pricing are open at intertakt.com.