Until now, IOTA’s primary wallet has been Trinity. Trinity was IOTA’s first stateful wallet, successfully making one-time signatures safe for human use. But Trinity, like the number system it owes its etymology to, will remain in IOTA 1.0. The wallet for IOTA 1.5 and beyond is called Firefly.
A production-ready version of Firefly was released for the Chrysalis migration on 21st April 2021. The migration process is simple. Whether before or after Chrysalis, all you will need to do is enter your IOTA seed into the new Firefly wallet, and it will take care of everything else.