Damus
What other clients give you easy access to zap notes? On Amethyst you double tap on the zap icon.
https://v.nostr.build/dymWaNXsVhAgK3A8.mp4
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Discussion
I thought so 🤙
I like to hold the zapper for a second so it brings up custom amounts and the ability to sign it with a note too 
Yes, I reverse engineered the private zaps back when they weren't defined anywhere so Amethyst was compatible with private zaps from Damus in the early days. I think they are potentially the only 2 clients up to this day if I didn't miss anything (DVMs also understand private zaps, but these are not clients)