Offline encrypted notes · Android

Your notes. Yours alone.
No cloud. No account. No copy.

Fortnote encrypts every note on your device before saving it, journals, passwords, recovery codes, ideas. Nothing readable ever leaves your phone.

★★★★★ Rated on Google Play Free to start · No account needed
vault status
Encryption verified ✓
Self-test on every launch
network
Disabled
Cloud sync: none
key storage
Android Keystore
Hardware-backed
Fortnote settings screen
Fortnote home screen
Fortnote encryption screen
The problem

Most note apps ask you to trust the cloud.

That's fine for shopping lists. It feels different when the note contains a password, a private journal entry, a recovery code, something you don't want sitting on someone else's server indefinitely.

Other apps
Cloud by default
Sync first, privacy second. Your notes live on their servers, not yours.
Fortnote
Offline by design
Notes never touch a server. Your vault lives only on your phone.
How it works

Your key never leaves your phone.

You type, the key seals it on-device, only ciphertext is stored. No server ever receives anything readable.

fortnote — encryption pipeline
01 / Input
You type your note
Plain text, readable only on your screen. The moment you save, the vault takes over.
PLAINTEXTBank: recovery seed
word1 word2 word3…
— ENCRYPT →
AES-256-GCM · HMAC
02 / Storage
Only ciphertext is saved
Unreadable without your vault key. Stored locally, never transmitted anywhere.
STORED LOCALLY9F A4 2C 88 B1 EF 03 7D
C4 17 8A E2 55 F0 91 3B
Integrity verified
HMAC detects any tampering before decryption.
Keys on-device
Android Keystore, hardware-backed where available.
No server copy
Notes never leave your device in readable form.
What you get

Private like a vault. Simple like notes.

Serious security that doesn't get in the way of using the app every day.

01
Offline first
No silent sync. No account. Your vault lives entirely on your phone.
02
Strong encryption
AES‑256‑GCM seals every note. HMAC verifies integrity on every read.
03
Hardware-backed keys
Android Keystore with StrongBox where your device supports it.
04
Fast unlock
Biometric or PIN. No friction. Your notes in one tap.
05
Vaults and search
Separate vaults for separate contexts. Search runs locally, nothing leaves.
06
Encrypted backups
Manual export and import, encrypted. You decide where backups live.
The difference

Not another cloud notes app.

CapabilityFortnoteTypical notes app
Account requiredNoOften required
Cloud syncNo automatic syncOften default
Network accessNoneCommon
EncryptionAES‑256‑GCMVaries
Integrity checksHMAC verificationRarely explained
Key protectionAndroid KeystoreVaries
Trackers / adsNoneCommon
BackupsManual encrypted exportOften cloud-first
Real users

Trusted by people who care about privacy.

★★★★★

"Been looking for a safe, secure note app for a long time and this ticks all my boxes. No ads, offline, secure and encrypted. Very privacy focused and has a great dev. Give it a try, you won't be disappointed."

A
Google Play user
GOOGLE PLAY
★★★★★

"Very promising app with great privacy features! I'm looking forward to seeing where this goes, and I've enjoyed using it so far."

B
Google Play user
GOOGLE PLAY
★★★★★

"Strong encryption app for mobile devices."

C
Google Play user
GOOGLE PLAY
Pricing

Start free. Upgrade once.

No subscription. No recurring fees. Pay once, own Pro forever.

Core

Freeforever

A private offline vault for everyday secure notes.

  • Offline encrypted notes
  • No account or cloud sync
  • Up to 3 vaults
  • Local search
  • Biometric / PIN unlock
Download free
Launch price · limited time

Pro

£5.99one time

More control for people using Fortnote as a serious vault.

  • Everything in Core
  • Unlimited vaults
  • Encrypted backup import/export
  • Auto-lock and auto-close
  • Screenshot blocking where supported
  • Pinned notes
Unlock Pro in app

One-time purchase · No subscription · Own it forever

FAQ

Questions before you trust an app with your notes.

No. Your notes and vault data stay on your device. Fortnote does not provide automatic cloud sync and does not collect analytics about your notes.

Fortnote is designed around offline ownership first. No account, notes encrypted locally, no cloud copy for anyone to read, including us.

The vault is protected by your device lock, your Fortnote biometric or PIN, encryption keys in Android Keystore, and hardware-level protection where available. A rooted device increases risk, Fortnote warns you if it detects this.

Yes, with Pro. Manual encrypted export and import, you choose where the backup goes and protect it with your own password.

The safest place for your notes
is not someone else's server.

Keep journals, passwords, recovery codes, and ideas offline, on your device, under your control.