The latest articles on DEV Community by Musaed Alenezi (@kingq8). https://dev.to/kingq8 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3887316%2Fd6d685f5-8b16-4ed7-9cf8-608a1d58abdc.png https://dev.to/kingq8 en Musaed Alenezi Sun, 19 Apr 2026 12:03:35 +0000 https://dev.to/kingq8/i-built-a-free-browser-tool-to-test-any-phone-before-buying-it-no-install-needed-128b https://dev.to/kingq8/i-built-a-free-browser-tool-to-test-any-phone-before-buying-it-no-install-needed-128b <p>Buying a used phone is risky.</p> <p>You never really know if:</p> <ul> <li>The touch screen has dead zones </li> <li>Sensors (gyro, proximity) actually work </li> <li>The battery is degraded </li> <li>The device has hidden performance issues </li> </ul> <p>Most people just check the basics and hope for the best.</p> <h3> So I built a solution for myself </h3> <p>I created a browser-based tool that runs a full diagnostic test on your phone — no app install needed.</p> <p>It tests things like:</p> <ul> <li>Touch screen accuracy (with grid detection)</li> <li>Display quality</li> <li>Audio &amp; microphone</li> <li>Motion sensors</li> <li>Camera</li> <li>CPU &amp; performance</li> <li>Network &amp; storage</li> <li>Vibration &amp; more</li> </ul> <h3> Why browser-based? </h3> <p>I wanted something:</p> <ul> <li>✅ Fast (no downloads)</li> <li>✅ Private (runs locally)</li> <li>✅ Works on any device (Android / iOS)</li> </ul> <h3> Real use case </h3> <p>This is especially useful if you're:</p> <ul> <li>Buying a used phone</li> <li>Selling your device and want proof it works</li> <li>Troubleshooting hardware issues</li> </ul> <h3> Try it here </h3> <blockquote> <blockquote> <p><a href="https://appfixing.com/device-doctor/" rel="noopener noreferrer">https://appfixing.com/device-doctor/</a></p> </blockquote> </blockquote> <h3> I'd love your feedback </h3> <ul> <li>What tests would you add?</li> <li>Any ideas to improve accuracy?</li> <li>Would you trust browser-based diagnostics?</li> </ul> mobile showdev sideprojects webdev