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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.
Use case
Notes fits naturally into this flow.
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Application · uNotes
Notes.
Encrypted by default.
Encrypted personal notes
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What you can do
What you can do
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.
Use case
Notes fits naturally into this flow.
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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.
Use case
Notes fits naturally into this flow.
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Security
Security
Security for Notes.
Every UltimaOS app shares the same post-quantum cryptographic stack, so the security properties below apply uniformly. App-specific considerations are noted where they apply.
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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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Zero-knowledge server
The UltimaOS server only ever stores ciphertext and public keys. We cannot read your data — by design, not by promise. There is no encryption backdoor, no master key, no key escrow.
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Multi-device sync, single private key
Your private key is derived from your passphrase using Argon2id with high parameters. New devices derive the same key locally and can decrypt your entire history. The passphrase is never sent to the server — it is verified by an ML-DSA-65 signature on a server-issued challenge.
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How it works
How it works
How Notes works.
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01
Open Notes in your browser
UltimaOS runs in any modern browser — Chrome, Firefox, Safari, Edge. Nothing to install. Sign in with your passphrase-derived key, or restore from a 3-of-5 social recovery if you are on a new device.
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Your data is encrypted before it leaves your device
Every action — sending a message, uploading a file, creating a task, scheduling an event — is encrypted with XChaCha20-Poly1305 and authenticated with an ML-DSA-65 signature before any byte crosses the network boundary.
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Server stores ciphertext, returns it on demand
The UltimaOS server keeps an opaque blob per account and per conversation. When you open Notes, the encrypted blobs are streamed to your device, decrypted locally, and rendered. The server never sees plaintext.
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Changes sync to every device you sign in on
Any change you make is encrypted and uploaded; every other device you are signed in on pulls the new ciphertext and decrypts it. Live multi-device sync, with the cryptography guarantee that only your devices can read it.
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Inside the suite
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
Get started with Notes.
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01
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 private key, same encryption, one workspace.
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Frequently asked
Common questions
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, HKDF-SHA256 for key derivation, and Argon2id for passphrase hashing.
Can I use Notes on multiple devices?
Short answer
Yes. Sign in on any device with your passphrase and the same private key is derived locally. All your Notes content is then decrypted from the encrypted blobs the server returns. 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
During early access, UltimaOS is free for individuals and organizations. After early access, pricing will be per-seat with accessible family tiers and per-organization plans for businesses. 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.