Joypad AI

Joypad AI offers a free online controller tester that works in-browser with no download required, supporting PS5, PS4, Xbox Series, Xbox One, Nintendo Switch Pro, and all USB/Bluetooth gamepads. Users can test buttons, analog sticks, triggers, rumble/vibration, stick drift, and pressure sensitivity in real time. The company also develops Joypad OS, an open-source firmware (MIT license) for universal controller adapters built on the RP2040 microcontroller, enabling cross-console controller compatibility.

Gamers often need to verify controller functionality—checking for stick drift, button responsiveness, or rumble issues—but lack a quick, accessible tool without installing software. Additionally, controller compatibility across different gaming consoles remains a significant friction point.

Joypad AI provides a free, browser-based controller tester using the Gamepad API and WebHID for direct USB access, requiring no download. Their open-source Joypad OS firmware enables any controller to work on any console via universal adapter hardware.

Joypad OS is publicly available on GitHub as open-source firmware under the MIT license with released builds. The web tester is live and freely accessible at joypad.ai.