Free utilities
Check the connection, the display, or a keyboard without installing an app.
Device tests run in the tab. IP and DNS use the ToolStudio Worker when that URL is configured. The speed test talks to Cloudflare measurement hosts from the browser.
Keyboard tester
Press keys and watch them light up on a layout. Find stuck or unresponsive keys.
Mouse tester
Check left, middle and right clicks, scroll direction, and double-click timing.
Dead pixel test
Fill the screen with solid colors to find dead or stuck pixels.
Screen resolution checker
Live screen resolution, browser viewport, and device pixel ratio.
Internet speed test
Rough download estimate using Cloudflare speed endpoints from this browser. Not a lab-grade meter.
Questions
Do IP and DNS upload files?
No. Only a hostname or the connection metadata the Worker already sees.
Why are some utilities missing from the directory?
Worker-backed tools stay hidden until NEXT_PUBLIC_WORKER_URL is set. Media tools need NEXT_PUBLIC_ENABLE_MEDIA_TOOLS=1.