That's a nice find. Did you have a look at the code? Is it trustable?

Before I would use it, I would want to inspect it myself to verify it doesn't have some shady parts. As the old mantra in crypto goes: don't trust, verify! (Considering my rather low coding skills it'll take me quite some time for verification.)

Next is that the app and GUI need to be fully able to be build from the Github code, ideally the builds are reproducible. Not sure if reproducibility of compiled apps is currently possible (so far I didn't have time to look and check). I won't run untrusted or unverified code/apps on any of my systems that come close to some of my crypto stuff.

It's good more tools show up dealing with SLIP-39. Let's see how this tool stands the test of time.