Company
The company that decided not to have your keys.
Notes are designed to be encrypted before they leave your device. In the current build, AI actions on your notes happen locally. Sync is designed as encrypted, and it is switched off through the private beta. We designed the app so that we do not hold your key.
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, and we are building differently.
Prevon is built on a simple principle: the people who use a tool should be the ones who own it. Notes are designed to be encrypted before they leave your device, AI runs locally in the current build, and sync is designed to be end-to-end encrypted (it is off in the private beta). 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 design the app so that we do not hold your key, rather than relying only on a privacy policy.
Encrypted before it leaves
Notes are designed to be encrypted before they leave your device, so what a server holds is ciphertext. Sync is off in the private beta.
Local by default
The AI runs on your device, not our servers. In the current build, sync is off and nothing is designed to leave the device.
Transparency by design
Security through obscurity isn't security. Our architecture is documented so security researchers can review it.
How it works
Privacy by design, not just by policy.
Prevon is built around three core principles: local processing, encryption with keys we do not hold, and user control.
AI
On-device AI Brain
The Brain runs on your device. A cloud assistant is planned as an opt-in and is not enabled in the current build. Read the full architecture.
Learn moreEncryption
Encryption with keys we do not hold
Notes are designed to be encrypted on your device before sync. The key is made on your device and we do not hold it. Our servers are designed to see only — we do not have the key to read your notes.
Sync
End-to-end encrypted sync
Sync is designed as end-to-end encrypted, so the server stores encrypted blobs, and devices are designed to pair directly without the cloud. Sync is switched off for the current private beta.
Platforms
One app, every platform
Windows, Android, iOS, macOS, and Linux — the same Prevon app and the same encryption design. The iOS, macOS, Windows and Linux builds have not been security-reviewed yet. Switch devices without switching tools.
Control
Your data, your rules
Use Prevon offline with no account. Encrypted sync is planned and is off in the private beta. 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. In a standard vault the key is derived from your recovery phrase, which we do not hold.
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 we aim to keep your data under 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.
The app is designed so that we do not have access to your unencrypted notes. If you lose your recovery phrase, we cannot recover them.