Export from Hevy
In Hevy, open Profile > Settings > Export & Import Data > Export Data > and choose Export Workouts.
Import your Hevy export into Gains in about a minute. Every workout, PR, and chart comes with you.
In Hevy, open Profile > Settings > Export & Import Data > Export Data > and choose Export Workouts.
In Gains, open Settings, choose Import Workout History, and pick the file.
Gains shows exactly what it found before anything is saved.