End-to-End Encrypted

Your thoughts.
Encrypted. Private.

A lightning-fast workspace with notes, vault, calendar, and messaging — all powered by zero-knowledge encryption. No one sees your data. Not even us.

Download for Windows View Source

Also available for macOS · Linux · Android & iOS (coming soon)

Try Onyx Live

Experience the full app right here in your browser.

Built for everything you do

One encrypted workspace. Notes, messages, calendar, email, vault, and cloud — all private by default.

Notes

Distraction-free Markdown editor with full GFM support, code blocks, LaTeX math, and instant formatting.

Available Now

Vault

Zero-knowledge password manager with breach monitoring, auto-fill, and tamper-proof storage.

Available Now

Cloud Sync

Real-time encrypted sync across every device. Your data travels through a stateless relay — no logs, no metadata.

Available Now

Messages

Signal-level encrypted messaging with servers, channels, and voice — all private by default.

Coming Soon

Calendar

Schedule, agenda, and task tracking — encrypted end-to-end and synced across your workspace.

Coming Soon

Email

Private IMAP & SMTP with client-side encryption via Rust backend. Your inbox, truly yours.

Coming Soon

Security that's non-negotiable

Built from the ground up with a zero-trust architecture. Every byte is encrypted before it leaves your device.

End-to-End Encryption

AES-256-GCM encryption with PBKDF2-derived keys. Your master password never leaves your device. Even if our servers are breached, your data remains unreadable.

Zero-Knowledge Architecture

We mathematically cannot access your data. No backdoors, no master keys, no exceptions. What you store is visible only to you.

Stateless Relay

Emails and sync traffic are dispatched through a stateless relay. No metadata, no content, no IP addresses are ever logged. Privacy at the infrastructure level.

Open Source

Every line of code is open for inspection under GPL-3.0. Audit it, fork it, verify it yourself. Trust through transparency, not promises.

Simple, honest pricing

No hidden fees. No data mining. Just straightforward storage for your encrypted workspace.

Starter

Free

Get started with encrypted notes and vault.

  • 1 GB encrypted storage
  • Unlimited notes
  • Password vault
  • E2E encryption
  • Works offline, always
Download Onyx

Basic

$1 AUD/mo

More space for your growing workspace.

  • 25 GB encrypted storage
  • Everything in Starter
  • Cloud sync across devices
  • Priority relay access
Download Onyx

Pro

$2 AUD/mo

For power users who need more room.

  • 50 GB encrypted storage
  • Everything in Basic
  • Advanced search
  • 24/7 support
Download Onyx
Best Value

Ultra

$3 AUD/mo

Maximum storage. Maximum privacy.

  • 200 GB encrypted storage
  • Everything in Pro
  • AI assistant
  • Early access to features
Download Onyx

What's next

Onyx is in active development. Here's where we're headed.

Current

Alpha

Notes, Vault, Cloud Sync, and core E2EE infrastructure. Available on Windows, macOS, and Linux.

Q2 2026

Beta

Encrypted messaging with servers and channels. Calendar integration. Public release candidate.

Q3 2026

Mobile

Android app launch, followed by iOS. Full sync with desktop workspace.

Q4 2026

Collaboration

Real-time encrypted collaboration on shared notes. Private email client. Voice channels.