Keygrain の個人情報保護方針
Keygrain does not collect, store, or transmit any personal data. Your master secret never leaves your device.
When sync is enabled, your service list is encrypted locally (AES-256-GCM) before transmission. The server stores only encrypted data and cannot decrypt it. No plaintext user data reaches the server.
No analytics. No tracking. No telemetry. No account required.
Full policy: https://keygrain.com/privacy.html