Help with Interval Timer - FTNSS.

Not quite — Interval Timer - FTNSS is in final development and coming soon to the App Store and Google Play. Email us and we'll tell you the moment it launches.

iPhone and Android, with watch apps for Apple Watch and Garmin (Fenix and Descent, via a Connect IQ companion).

Open FTNSS Settings → Send Feedback, write what happened or what you'd like, and optionally attach a screenshot. Your app version, iOS version and device model are included automatically so we can reproduce it — the app shows you exactly what's attached before you send. Add your email if you'd like a reply. It goes straight to us; what happens to that report is covered in the privacy policy.

Yes. You sign in with Apple or Google to use Interval Timer - FTNSS. Your workouts live on your device, and your account keeps a copy of what you record and set up in the app (workouts, courses, timers, routines, plans, gear, HRV readings and settings), so a new phone gets it all back. Download My Data in FTNSS Settings gives you everything the account holds, and Delete Account deletes it. See the privacy policy for exactly what that means.

Wear your Apple Watch, or pair a Bluetooth heart-rate strap. Interval Timer - FTNSS records heart rate against each phase as you go, so your summary shows the trace banded by what you were actually doing — not one workout average.

It's a two-minute measurement taken at rest, from a paired Bluetooth heart-rate strap — a strap reports the beat-to-beat timing that HRV is calculated from, which a wrist sensor doesn't expose. Pair one in FTNSS Settings → Pair chest strap, then take a reading from Trends → Readiness. Without a strap connected the Start button stays disabled: we'd rather show you nothing than a number we can't stand behind. The rest of the app works normally without one.

Yes, via export: share any activity as a .FIT file and upload it to Strava. A one-tap Strava connection is built and coming in a post-launch update — it isn't in the first release, so you won't find it in Settings yet. When it lands you'll sign in on Strava's own page, so we never see your password, and you can disconnect any time.

Install the FTNSS Connect IQ companion on your Garmin, then pair it from FTNSS Settings → Garmin. Your timer library syncs to the watch, and finished runs come back with per-interval heart rate. Those runs also save natively to Garmin Connect.

Yes, always. Every activity exports as a standard .FIT file via the share sheet — upload it to Strava, import it to Garmin Connect, or keep it. iPhone-recorded runs and HRV readings also save to Apple Health.

Yes, and Claude Code and Codex. See AI assistants.

Check that Interval Timer - FTNSS has permission: Settings → Health → Data Access & Devices → FTNSS, and make sure writing is enabled. iOS asks per data type, so it's easy to miss one. Still stuck? Email us.