Contact & Hardware Database Contributions

Contact Online Ruler Plus

Reach out to our engineering team to contribute a verified display density profile, report a browser calibration issue, or ask technical screen metrology questions.

Open Online Ruler

01 · Technical Support

How do you contact Online Ruler Plus support?

Technical support for Online Ruler Plus handles calibration questions, WCAG 2.2 accessibility feedback, and cross-browser rendering reports across Chrome, Safari, Edge, and Firefox. When reporting a ruler rendering or zoom rescaling issue, please include your operating system version, browser name and zoom percentage, and whether you calibrated via ISO/IEC 7810 ID-1 credit card or visible screen diagonal. Because Online Ruler Plus performs measurement math locally in your browser, we never automatically collect device diagnostics unless you include them in your message.

[email protected]

02 · Hardware Database

How do you submit a new device display profile?

Display profile submission is our verification workflow for expanding the Auto-Detect Device reference list in Online Ruler Plus. To submit a laptop, desktop monitor, tablet, or smartphone panel, first calibrate your display using a physical 85.60 × 53.98 mm ISO/IEC 7810 ID-1 bank card at 100% browser zoom. Second, open the 3. Auto-Detect Device tab in the calibration section and copy the four hardware telemetry values reported by your browser: screen.width × screen.height, devicePixelRatio, platform family, and your verified CSS PPI / pxPerMm reading.

Inspect your device telemetry in Auto-Detect →

03 · Self-Service Troubleshooting

Where can you solve common calibration issues immediately?

Most on-screen measurement discrepancies are caused by non-100% browser zoom during diagonal entry, Windows or macOS HiDPI display scaling overrides, or dragging a browser window from a laptop screen onto an external monitor without switching calibration profiles. Before emailing support, review our Screen Calibration & PPI Guide, check the 20-question Frequently Asked Questions knowledge base, or follow the 3-step How to Use manual to verify your ruler with a US Quarter (24.26 mm) or 1 Euro coin (23.25 mm).

Browse 16 Calibration & PPI FAQs →

04 · Bug Report Checklist

What details help resolve calibration or layout issues fastest?

To help our engineering maintainers reproduce rendering, fractional scaling, or protractor interaction behavior reliably, please include five items in your email to [email protected]: (1) your exact device model and external monitor size if applicable, (2) OS display scaling percentage (such as Windows 125% or macOS Default Retina), (3) browser name and zoom level, (4) the active calibration readout displayed inside the Status Badge, and (5) steps to reproduce the issue on desktop or touch viewports.

05 · Policy, Privacy & Accessibility Requests

How are privacy, legal, and accessibility notices handled?

All inquiries concerning privacy rights, cookie consent controls, intellectual property notices, metrology documentation corrections, and keyboard/screen-reader accessibility are reviewed directly through [email protected]. We review incoming technical and compliance correspondence regularly and only use submitted contact details to respond to your request and maintain accurate documentation across OnlineRulerPlus.com. See our Privacy Policy and Terms of Use for full governance details.