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protONsteam shows ProtonDB Linux compatibility ratings directly on Steam game pages — right next to the game title, no tab switching needed.

Supported tiers: Native, Platinum, Gold, Silver, Bronze, Borked, and Not Rated.

Clicking the badge opens the full ProtonDB page for that game, where you can read community reports and compatibility notes.

Disclaimer: This is an unofficial community project, not affiliated with ProtonDB, Valve, or Steam.