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It opens straight onto the dial, already turning. The card is engraved and turns under a fixed index, the way a real compass does: what you need to read is always at the top, and you never chase a needle around the screen.
The card turns, the index does not: you always read at the top. 
Mark a bearing and the app says how far to turn. 
When the field is disturbed it says so, instead of keeping quiet.
What it does
- The bearing in degrees and in words. "212° · South-west": the number for using it, the name for saying it out loud.
- The card turns, the index does not. That is the way round a real compass works, and it changes how you read it: under the fixed mark is always the direction you are facing.
- Tilt-compensated. It works with the phone in your hand, not only flat on a table — which is how a compass actually gets used.
- Mark a bearing and follow it. The app tells you how far to turn and buzzes when you are on it: no need to watch the screen while you walk.
- Honest warnings. When metal or magnets disturb the field, Compass says so instead of pretending everything is fine.
- In English and Italian, following the phone's language.
When the compass cannot work, it says so
A magnetometer inside a phone is a delicate thing: a railing, a car door, a loudspeaker or a case with a magnetic clasp is enough to move the reading by tens of degrees. This app's choice is to say it — a warning when the field is disturbed, and a plain message on a device that has no magnetometer at all. A needle that keeps turning confidently while pointing the wrong way is worse than no needle.
Your data stays yours
Compass does not ask for your location: the bearing is magnetic north, computed on the phone from the sensor. Readings never leave the device, there is no account and there is no server of ours. Two permissions: Internet, which the ads need, and vibration for the haptic feedback — which you can switch off.
How it is paid for
A banner at the bottom, away from the controls, and an occasional full-screen ad only after you got what you came for. No subscription, no feature held hostage.