The company that decided not to have your keys.
Most companies ask you to trust them with your data. We built a company that made trust unnecessary — the architecture makes it structurally impossible for us to read what you write.
Every note is encrypted before it leaves your device. Every AI action that touches your notes happens locally. Every sync is encrypted — though sync stays switched off through the private beta. We didn't add privacy as a feature — we removed our own ability to violate it.
Read why this actually got builtOur mission
Most note-taking apps treat your private thoughts as a product. Your data feeds AI models you never agreed to, gets mined for advertising insights, and sits on servers you have no control over. We think that is wrong.
Prevon is built on a simple principle: the people who use a tool should be the ones who own it. Every note is encrypted before it leaves your device. Every AI operation happens locally. Every sync is end-to-end encrypted so that even we cannot read your content. We build privacy-first because we believe privacy is a right, not a feature.
Our principles
Privacy isn't a feature. It's the foundation.
Privacy as architecture
We don't add privacy policies to protect you. We remove our own ability to violate your privacy by design.
No data to breach
Your notes are encrypted before they leave your device. Even a complete server breach reveals nothing.
Local by default
The AI runs on your device, not our servers. Your data never touches cloud infrastructure unless you explicitly enable sync.
Transparency by design
Security through obscurity isn't security. Our architecture is documented and verifiable by security researchers.
How it works
Privacy by design, not just by policy.
Prevon is built around three core principles: local processing, zero-knowledge encryption, and user control.
AI
On-device AI Brain
The Brain runs entirely on your device by default, with an optional opt-in cloud assistant. Read the full architecture.
Learn moreEncryption
Zero-knowledge encryption
Every note is encrypted on your device before sync. Encryption keys never leave your devices. Even our servers see only — we cannot read your notes, full stop.
Sync
End-to-end encrypted sync
Sync across devices with full end-to-end encryption. The cloud provider sees only encrypted blobs, and devices can also pair directly, skipping the cloud entirely. Sync is switched off for the current private beta.
Platforms
One app, every platform
Windows, Android, iOS, macOS, and Linux — the same Prevon app with full encryption on every platform. Switch devices without switching tools.
Control
Your data, your rules
Use Prevon completely offline with zero accounts. Or add encrypted sync. Or export your entire vault as an encrypted backup. You choose how much you share, and with whom.
Portable
Data portability
Your data is portable — you can export the whole vault as an encrypted backup at any time. Nothing holds it hostage but the key, which is yours.
Built to be audited.
Prevon is built with transparency as a core principle. We believe privacy tools should be verifiable by the people who use them. We publish how our encryption works on the trust page, we welcome independent review, and your data never leaves your control. We haven't been audited by a third party yet — when we are, you'll find the report here.
Your keys. Your data.
We never have access to your unencrypted notes. This isn't a promise — it's enforced by architecture.