Your vault, ready to install

Download NullKey from Google Play, check device compatibility and plan a safe backup before moving data.

0.5.3 · Available on Google PlayChecked 5 November 2026

Get NullKey

NullKey is free to download and free to use for up to 30 items. An optional one-time purchase removes that limit.

The listing opens in Google Play. Confirm the publisher is Alvento Ltd and package is uk.alvento.nullkeyapp.

Android 12L or later

Google Play lists Android 12L (API 32) or later as the requirement. Optional biometric and hardware-backed unlock features depend on your device.

NullKey is on Android today. An iPhone version is coming soon.

Start with sample files. Create an encrypted backup and practise restoring it into a separate empty vault before relying on NullKey for important data.

Free to start, one payment for no limit

NullKey is free for up to 30 photos, files and notes. NullKey Unlimited is a one-time purchase in Google Play that removes the limit. Google Play shows the price for your country before you buy. There is no subscription.

Existing items, editing, export, backup and restore stay free, including a vault that already holds more than 30 items. The purchase belongs to the Google account that bought it. Buying or restoring it needs Google Play and an internet connection, while your vault itself stays offline. Google Play handles refunds under its own policy.

Moving from an older NullKey or Cellar app?

Earlier versions used different Android package IDs, including uk.alvento.cellar and uk.alvento.nullkey. They install separately from the current Play app, uk.alvento.nullkeyapp; installing the Play app does not move the old vault automatically. Backup compatibility across these earlier versions has not been verified here.

Keep the old app and its data in place. Do not uninstall it or clear its storage.
In the old app, make a backup and use its verification step if available. Keep the matching passphrase or recovery key separately.
Before relying on a transfer, contact support with the old and new app versions (never send a backup or secret) to confirm the supported restore path.
If a restore is supported, restore into a separate, empty vault and check several files before changing or removing anything.

Keep the original app and an independent backup until you have verified a usable restored copy. A recovery key unlocks data; it does not replace a backup.