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Keep

Name: Keep
Author: privkeyio

privkeyio

Keep is a FROST threshold signing app and dedicated Nostr event signer for Android.

Security & privacy
FOSS
Free
Nostr

Android only

Get Keep

Get it on Zapstore Get it on GitHub

What are these stores? Zapstore, GitHub

Keep is a FROST threshold signing app and dedicated Nostr event signer for Android. It allows users to hold FROST key shares on their phone and sign Nostr events without any single device ever holding the full private key. Keep implements the NIP-55 Android Signer protocol and NIP-46 remote signing, so any compatible Nostr client can request signatures directly.

Developer: privkeyio
Source code: github.com/privkeyio/keep-android
Added to AppCosmos: 10 October 2026
License: AGPL-3.0