A compass that does one thing well. Point your phone and read your heading in degrees and cardinal direction, on a clear instrument dial.
• Works fully offline — no internet needed
• Magnetic north with no permissions at all
• True north if you want it — location is used on your phone and never sent anywhere
• Tells you honestly when the sensor needs a figure-8 calibration
• One small banner at the bottom. Remove it once for a small fee. No pop-ups, no subscription.
Phone compasses depend on the magnetometer in your device: accuracy is typically within a few degrees after calibration, and metal objects nearby can disturb it.