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Fingerprint, face, or device PIN, once you've added a passkey in Settings. Or:

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Secure sign-in

Each sign-in is a one-time link sent to your email that expires in 30 minutes, or a passkey: your phone or computer's fingerprint, face, or PIN, which can't be guessed or phished. You stay signed in on your own devices.

Private, and yours

Your collection is seen only by you and the people you choose to share it with. Exact spots, your sites' GPS and directions, where specimens are kept, and every photo and paper are encrypted. Nothing is public unless you make a gallery to show it.