Contact the Ruler Online Team

Have a question about screen calibration, found a bug, or want your specific device added to our database? We’d love to hear from you.

Direct Email Support

Reach out directly to our dedicated engineering and support desk:

Typical response time: Within 24–48 business hours

Device Not Detected?
Send us your device model, native resolution, and operating system so our team can add its PPI profile.
Measurement Mismatch?
Verify that your browser zoom is at 100% (Ctrl+0 / Cmd+0). Use the Credit Card calibration mode for physical millimeter accuracy.
Embed / API Requests:
For educational or non-profit integration permissions, send your website domain and usage details to our email.

Fill out the form below and we will route your inquiry to the right specialist.