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Quick-capture notebook
Title, free-form body, one of seven color tags, pinned flag. Search across all notes. Copy-to-clipboard for any note.
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Application · uNotes
Notes.
Encrypted by default.
Encrypted personal notes
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Capabilities
What you can do with Notes.
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Masked by default
Existing notes are masked until you choose to reveal them. Shoulder-surfers see nothing. Newly created notes are unmasked so you can write immediately.
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Encrypted, syncs across devices
Every note is encrypted on your device. Sync across devices happens automatically. The server only ever stores ciphertext.
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Protection
Security for Notes.
Content in Notes is inside the end-to-end encrypted envelope: it is encrypted in your browser before it is transmitted, and the server stores ciphertext it holds no key for.
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Post-quantum cryptography by default
All authentication and key exchange uses NIST-standardized ML-DSA-65 (FIPS 204) signatures and ML-KEM-768 (FIPS 203) key encapsulation. There is zero RSA, zero elliptic-curve, zero classical-only crypto in the authentication path. Defeats store-now-decrypt-later attacks.
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End-to-end encryption on your device
Every payload is encrypted in your browser using XChaCha20-Poly1305 (RFC 8439) with a 192-bit nonce and a Poly1305 authentication tag. The plaintext exists only in your tab's memory. When you close the tab, the plaintext is gone.
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The server holds ciphertext it cannot open
For Notes content the server only ever stores ciphertext and public keys. It cannot decrypt your data — by architecture, not by promise: there is no backdoor, no master key and no key escrow, because no key that would open it ever reaches the server.
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Your keys stay on your device
Your private keys are derived in your browser from three secrets only you control, and are held in memory for the session only — never written to browser storage, never sent to the server. A new device derives the same keys locally from the same three secrets.
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Mechanics
How Notes works.
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Open Notes in your browser
UltimaOS runs in any modern browser — Chrome, Firefox, Safari, Edge. Nothing to install. Sign in by re-entering the three secrets your keys are derived from, and the same keys are rebuilt locally on whatever device you are using.
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Your data is encrypted before it leaves your device
Sending a message, uploading a file, writing a note — the content is encrypted with XChaCha20-Poly1305 and authenticated with an ML-DSA-65 signature before any byte crosses the network boundary.
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The server stores ciphertext and returns it on demand
The server keeps an opaque blob it has no key for. When you open Notes, those blobs are streamed to your device, decrypted locally and rendered. Plaintext exists only in your tab.
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Changes follow you across devices
Any change you make is uploaded and picked up by every other device you are signed in on, so Notes looks the same wherever you open it.
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Inside the suite
How Notes fits in the suite.
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Tasks
Convert any highlight in Notes into a task. Tasks inherits the note fragment as context.
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Documents
Promote a Notes body into a Documents draft. Formatting and color tags carry over.
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Calendar
Notes with a date in the body get a Calendar reminder suggestion.
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Account
Notes are encrypted to your private key. Masked by default to prevent shoulder-surfing.
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Get started
Get started with Notes.
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Open Notes in your browser
UltimaOS runs in Chrome, Firefox, Safari and Edge. Nothing to install. Sign in with your passphrase to derive your private key locally.
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Open the workspace and launch Notes
The launcher shows every app. Notes is right there with its capsule video preview. Click to open.
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Connect it with the rest of the suite
Notes works alone, but it shines when combined with the rest of the UltimaOS apps. Same identity, same workspace, one place to work.
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Frequently asked
Questions about Notes.
Is Notes end-to-end encrypted?
Short answer
Yes. All content in Notes is encrypted in your browser using XChaCha20-Poly1305 with a fresh key per item. The UltimaOS server only ever stores ciphertext and public keys — it cannot decrypt your data, no matter who asks.
What cryptography does Notes use?
Short answer
Notes uses the same post-quantum stack as every other UltimaOS app: ML-DSA-65 (FIPS 204) for authentication, ML-KEM-768 (FIPS 203) for key encapsulation, XChaCha20-Poly1305 (RFC 8439) for symmetric encryption, and HKDF-SHA256 for key derivation.
Can I use Notes on multiple devices?
Short answer
Yes. Sign in on any device by re-entering your three secrets and the same keys are derived locally, so your Notes content follows you. Changes sync live across all signed-in devices.
Is Notes GDPR-compliant?
Short answer
Yes. UltimaOS is built and operated in the European Union by an EU company. The architecture is GDPR-compliant by design — encrypted data, EU-only infrastructure, no US CLOUD Act exposure, no advertising, no third-party trackers. See the GDPR page for the full breakdown.
How much does Notes cost?
Short answer
UltimaOS is free for individuals and families — permanently, not as a trial. Organizations pay per seat once early access ends, and that is what funds the free accounts. There is no per-app add-on.
Can I export my Notes data?
Short answer
Yes. UltimaOS supports encrypted export of all your content for backup and portability. The export is encrypted to a key you control; you can store it on your own infrastructure or in a personal encrypted backup.
Can I export my notes?
Short answer
Yes. Notes can be exported individually or in bulk as encrypted JSON, or as plain Markdown if you choose to reveal them first. Plain export is opt-in per export.