Digital Compass
Free, private and calculated in your browser
Sensor compass
0° N
Best on mobile: live heading requires a phone or tablet with an orientation sensor. Desktop users can use the manual simulator.
Magnetic heading is approximate and may need figure-eight calibration.
About this tool
Digital Compass is a privacy-first utility designed to finish a small everyday task without an account, remote API or server-side data store. Inputs are processed in the browser and the visible result is available immediately, including when the calculation itself is performed offline.
The interface keeps the important caveats beside the result. Sensor readings are labeled as estimates, dates and financial projections expose their assumptions, and health or travel information includes a clear reminder to confirm decisions with an appropriate professional or official authority.
How to use
Choose a mode
Open the tool and select the measurement, calculation or study mode that matches your task.
Enter local values
Use the labeled inputs and sample values. Permission-based features request access only after you press their start button.
Review the result
Read the result and its limits. Time-sensitive tools use absolute timestamps so background tabs do not create drift.
Export or reset
Copy or download only when needed, and reset the form when you finish on a shared device.
Use cases
Quick personal workflow
Use it for a one-off measurement, conversion, study session or planning estimate without creating a profile.
Offline and private work
Keep notes, values and local records in the current browser session when connectivity or data sharing is undesirable.
Common mistakes
Mistake:Treating an estimate as a certified measurement or official decision.
Fix:Read the tool disclaimer and use calibrated instruments or official sources when accuracy has legal, medical or safety consequences.
Mistake:Leaving sensitive values open on a shared device.
Fix:Export only the information you need, then clear the form or close the private browser session.
Frequently asked questions
Related guides
A Camera Feed That Never Leaves Your Browser
How a mirrored front-camera preview works entirely client-side with getUserMedia, and why that architecture makes it a genuine mirror substitute, not a camera app.
GPS Speed Without a Speed Sensor: the Haversine Fallback
What happens when navigator.geolocation reports position but not speed, and how consecutive fixes plus the Haversine formula fill the gap.
Turning a Phone Into a Bubble Level
How beta/gamma device-orientation angles become a bullseye level, why ±0.2° is the tool's flat threshold, and where a phone sensor still loses to a real spirit level.
References & standards
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