2of3 by Ente

I know this is just Samir’s secret sharing and that there are lots of options (I’ve written a few implementations of it over the years as one of my default simple practice things that lets me get a quick feel for a new language) but the UI is slick and the QR code output is smart. Banana split is good as well (similar but less polished looking, maybe I am just use to dark mode stuff) but it’s a little more heavy handed and requires a passphrase - ideal for some cases but not others.