NULVEX

Freemium#20 of 30 in Secure Notes Apps

NULVEX: A specialized Android vault for notes that expire, self-destruct, or disappear on demand. Ranked #20 of 30 in Secure Notes Apps by our editors (6.7/10); pricing: Free plan; best for highly sensitive self-destructing Android notes.

6.7/10★★★☆☆Editor score

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NULVEX6.7 Visit NULVEX

At a glance

• Editor score
  6.7 / 10
• Pricing
  Free plan
• Best for
  Highly sensitive self-destructing Android notes
• Free plan
  Yes
• Encryption model
  End_to_end
• Facts checked
  21 Sep 2026

• Where it wins

  • XChaCha20-Poly1305 encryption with Argon2id key derivation
  • Read-once notes, time-to-live expiry, and panic wipe
  • Decoy vaults, encrypted backups, and optional zero-knowledge sync

• Where it doesn't

  • Available only on Android
  • Remote sync is optional rather than the default storage model
  • Ads and in-app purchases are listed on Google Play

Our verdict on NULVEX

NULVEX is an Android secure-notes vault for privacy-focused users, including journalists and activists. Notes are stored locally by default in an encrypted vault using XChaCha20-Poly1305, while Argon2id hardens PIN and password-derived keys. Its focus is narrow and clear: protecting sensitive notes rather than providing a broad cross-platform workspace. Android users who need offline access and controlled note destruction should find the feature set closely aligned with that use case.

The standout protections go beyond ordinary encrypted note storage. Read-once notes are destroyed after their first opening, and time-to-live settings can automatically expire notes. A panic wipe removes vault data and keys, while a separate PIN can open a decoy vault. Biometric unlock and Android Keystore key wrapping add device-level access options. Encrypted local backups, encrypted note-sharing packages, and optional zero-knowledge remote sync or backup extend the protection model without changing the offline-first design.

NULVEX follows a freemium model with a free plan and Pro entitlement limits. Google Play lists ads and in-app purchases. The project is open source, distributed through Google Play, and publishes its source code on GitHub. Its Android-only availability is the main ecosystem constraint, especially for people who need notes across desktop or iOS devices. Choose NULVEX for highly sensitive Android notes where expiration, read-once access, panic wiping, and decoy storage matter most. Choose an alternative if cross-platform access or a broader productivity system is more important than specialized note protection.

Your product? Our editors can test NULVEX in depth and publish a review, labelled as paid · from $149/mo →

NULVEX pricing

NULVEX fact sheet

Alternatives to NULVEX

• JoplinA flexible, low-cost choice for encrypted notes across desktop, mobile, and web.9.2
• Standard NotesA privacy-focused notes app with offline editing and several editor types.9.0
• NotesnookA low-cost encrypted notes app with broad platform coverage and useful integrations.8.8

See all NULVEX alternatives →

Featured on iTechGuides

NULVEX is listed in our Secure Notes Apps directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update