> runtime

▌ SUPPORT ▐

Last updated: 5 June 2026

Need a hand? Email dev@klaiver.com and we'll get back to you. Including your device model and watchOS/iOS version helps us help you faster.

Support Runtime

Runtime is free — no ads, no subscription, nothing locked. If it makes your runs better, you can leave a completely optional tip. Thank you.

Getting started

  1. Open the iPhone app and add your own music files.
  2. Select the songs you want and send them to your Apple Watch.
  3. On the watch, pair your Bluetooth headphones and press play.

FAQ

Do I need a subscription or an account?
No. There is no account, no login, and no subscription. Ever.
Does it work without internet?
Yes. The app is fully offline. No Wi-Fi or cellular is needed to load or play your music.
Can I leave my phone at home on a run?
Yes — once songs are synced to your Apple Watch, you can take only your watch and Bluetooth headphones.
How do I get music into the app?
Add music files you already own through the iPhone app, then send them to the watch. The app is a player for your own music; it is not a streaming service and does not include a catalog of songs.
My headphones won't connect.
Pair them in the Apple Watch's own Bluetooth settings first, then start playback in the app. Make sure they're charged and in pairing mode.
Songs won't transfer to the watch.
Keep the iPhone and watch close together and both unlocked while transferring. Large libraries can take a few minutes.
What data do you collect?
None. See our Privacy Policy.

Contact: dev@klaiver.com _