It is a submarine swap. Probably the same that muun uses in the backend
Discussion
It seems muun is still being maintained, there have been updates in february.
But i can't find an apk in the github...
Are you aware of any similar, easy to use apps?
There are some apps listed on the boltz website but they all seem more complicated with liquid and stuff.
Boltz.exchange
Swaps between liquid, on chain, lightning and rootstock
