Is it the screen, or is it you. ScreenTestHQ started as a single white screen test, built to settle that question in a few seconds instead of a forum thread. It stayed small on purpose: a page for each real diagnostic, nothing dressed up as a diagnostic that isn't one.
Why this exists
Most "test your screen" pages online are built around ad slots first and the actual test second, or they mix genuine diagnostics with prank screens and fake crack effects that add nothing useful. Neither approach is what someone standing in front of a used monitor at a flea market, or troubleshooting a laptop camera five minutes before a call, actually needs. They need the tool to load immediately, do one thing correctly, and get out of the way.
What guides how it's built
- Genuine diagnostics onlyEvery tool here measures or displays something real. No fake glitch effects, no prank screens dressed up as tests.
- No signup, no installOpen a page and the tool works immediately, on a phone, laptop, or borrowed computer.
- Runs on your deviceScreen tests are colors rendered locally. Camera and microphone tools process that feed in your browser; nothing is uploaded.
- Fast by defaultPages are built with system fonts and minimal script, aimed at loading quickly on any connection.
Who builds it
ScreenTestHQ is an independent project, built and maintained by one person rather than a large team. New tools get added as they're finished and tested, which is also why the tool list keeps growing rather than shipping all at once. If something is broken, unclear, or missing, the contact page is the fastest way to reach me directly.