For those on iOS I forked nostr:npub1v0lxxxxutpvrelsksy8cdhgfux9l6a42hsj2qzquu2zk7vc9qnkszrqj49's zap.stream nostr:npub1eaz6dwsnvwkha5sn5puwwyxjgy26uusundrm684lg3vw4ma5c2jsqarcgz and enabled 1-tap zaps on mobile.
Try it at the below link: (Generate a new account, then go to settings -> Zaps).
You can save it as a PWA and then zap seamlessly.
Note: I just did this for fun on a Saturday night. Kieran told me a proper settings page is coming in the future :-)