Steam, GOG, Epic, itch, PICO-8 and emulated games, as one library.
Steam. Your whole account, with playtime and achievements.
GOG and Epic. Signed in inside the app, installed without a store client.
itch.io, Flatpak and the rest. If it runs from a terminal, it goes on the shelf.
PICO-8 carts. Hundreds, with their own artwork.
Emulated games. Brought across from EmuLatte.
Covers, art, logos, descriptions, genres, years, HowLongToBeat times and review scores, fetched once and kept on your disk. A store changing its API doesn't empty your shelf.
02_the_game_page
Everything about a game, in one place
Your GOG game's manuals, fetched, kept, read in place.
Manuals. GOG ships PDFs with loads of games and never says so. Downloaded, attached, read in place.
Achievements from GOG and Steam in a single list, with what you've unlocked.
Save games backed up to a zip and restored, without leaving the page.
Trailers, screenshots, and a description actually worth reading.
Compatibility. Proton version, prefix, winetricks, environment variables, all per game.
03_your_data
The library is a folder you can carry
One folder beside the AppImage: the database, covers, screenshots, playlists, save backups, settings.
Copy it and it moves. Another machine, another drive, a USB stick.
Back it up by copying it. No export step, nothing to export.
Delete it and it's gone. Nothing left behind anywhere else.