Used Phone/Laptop Check
A checklist for second-hand devices: screen (dead pixels), touch, speakers, microphone, cameras, vibration, sensors and keyboard, then copy the summary.
Device → Summary
Why it is safe to use
- Runs entirely in your browser; nothing you enter is sent to a server.
- Free, with no account and no sign-up.
- Installable as an app; a tool you have opened keeps working offline.
- Open source (MIT) on GitHub.