For OpenEmu alternatives, choose a small legally obtained library across the systems you actually use.
- Launch each game and compare core compatibility and performance.
- Test controller mapping, hotkeys, display settings, and audio.
- Back up in-game saves and save states separately; verify imported files load.
- Check library metadata, artwork, and platform support.
- Confirm firmware or game-data requirements in official documentation.
A front end may look better while a favorite title runs worse. Keep saves and source files untouched until a reversible migration succeeds.