Hardware Detection & Info

Connect to a BLE device and read its Battery Service characteristic. See the charge level in a gauge.

Developer Tools API battery BLE Bluetooth

Read and write NDEF records to NFC tags using the Web NFC API. Supports text, URL, and MIME records. Works on Android with Chrome.

Developer Tools NDEF tag Web NFC write

Request a USB device and communicate with it using the Web USB API. See vendor and product IDs. Experimental.

Developer Tools API console device Web USB

Connect to a serial device (Arduino, etc.) via the Web Serial API. Send and receive text. No native app needed.

Developer Tools API microcontroller terminal Web Serial

Connect a game controller and see every button press, axis movement, and vibration test. Uses the Gamepad API.

Developer Tools API button gamepad tester

Measure your browser's GPU compute power using a simple WebGPU matrix multiplication. See raw FLOPS and compare with peers. Fully client‑side.

Developer Tools benchmark GPU performance WebGPU

Request HID devices and list them. Read input reports and send output. For custom hardware and controllers.

Developer Tools API devices HID Web HID