Support
Short answers, and a real email address.
No vibration on my iPhone?
Check the Haptics toggle is on in the app, that your phone isn't in Low Power Mode, and that System Haptics is enabled under Settings › Sounds & Haptics.
No vibration in the browser?
iPhone Safari doesn't support web vibration at all — an Apple limitation, not a bug. Android Chrome does. For real haptics on iPhone, use the free app.
No sound?
Check the Sound toggle and your ringer switch. Browsers also need one tap on the page before audio can start.
Is it really free?
Yes. No adverts, no subscription, no account.