Last I heard Damus is working on incorporating zaps and it should have that feature soon.

Yes you can zap using Iris.

There's something I don't like about Iris though. User experience isn't my favorite.

I use Snort on desktop and Amethyst on Android. But Amethyst has been super buggy lately.

We are early days in Nostr. More clients will come in the future and the current ones will improve.