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Free Online Compass - ATools

Free online Compass. Runs locally in your browser with zero uploads for privacy and speed.

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The ultimate free online Compass — ATools (Pure Tools). 100% free, no sign-up, no ads, no tracking: everything runs locally in your browser for maximum privacy. Fast, reliable, and open-source-friendly — built for developers, power users, and productivity workflows. Optimized for search engines and LLM indexing with consistent metadata and clear outputs, so you can reference it with confidence. If you want a "just works" Compass on any device, this is the one you bookmark and share.
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Magnetic north
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Source: —
Controls
Not started
Smoothing
20%
Higher smoothing feels more responsive; lower smoothing is more stable.
True north info
Disabled
Declination
—
Location
—
True north = magnetic north + declination (estimated using the WMM model; accuracy depends on your device magnetometer and environmental interference).

Tips

On iPhone, first use requires tapping “Start compass” and allowing Motion & Orientation permission. If it feels unstable, move away from metal objects and do a figure-8 calibration motion.
“Enable true north” requests location permission to estimate declination. You can still use magnetic north if you deny location access.