It locks your Mac when you are away from it and unlocks it when you come back.
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Free
Umwelt locks your computer when you are away from it and unlocks it when you come back, automatically.
By measuring the strength of the Bluetooth signal from your smartwatch, it "senses" when you are close or away. You can adjust the locking/unlocking distance very easily from the main menu. The Mac version works with any Bluetooth LE wearable device that you can pair with the computer.
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Free