Prevon

Ask your notes anything. The AI runs on your device.

Privacy by design, not policy.

Apply for the betaIt’s free.

Runs on-device · No account · Free to use

How the encryption works
Why use Prevon?

Why use Prevon?

Everything it does, in six short answers.

Ask your notes anything.

Type a half-remembered thought and Prevon answers from what you wrote. The AI runs on your device, not on a server.

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Write without being read.

Notes are encrypted on your device. By default nothing is sent anywhere, and Prevon does not hold your key.

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Never file a note again.

New notes find their own folder, and your folders keep their shape however deep they go.

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Switching is easy.

Bring your notes from Notion, Evernote, Google Keep, Obsidian, Bear, Apple Notes, or plain Markdown and text files. Point Prevon at the export and it does the rest.

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One key, and it’s yours.

Your notes are locked with a key made from a 12-word phrase that Prevon never stores.

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On every device you own.

Built for Windows, macOS, Linux, Android and iOS. Pair two devices directly now; encrypted sync is planned.

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On-device AI

Ask your notes anything.

Ask in your own words, even half-remembered ones. Prevon finds notes by what they mean, not only the words you typed, and answers from what you wrote.

Where it runs
On your device
Needs the internet
Not to search, once its model files are downloaded
Finds notes by
Meaning, not just keywords
Cloud AI
None in the app

Encryption

Write without being read.

Your notes are stored encrypted on your device. Sync is switched off by default; the planned sync is designed so our server only passes along ciphertext it cannot open. Prevon has not had an independent security audit yet.

Encrypted
On your device, in the vault
What our server sees
Nothing, by default; sync is off
Who holds the key
You, not Prevon
Independent audit
Not yet
How it works
Published on the Security page, limits included

Auto-filing

Never file a note again.

The on-device AI reads each new note and puts it in the folder it belongs in. Your folders keep the shape you gave them, however deep they go.

Files new notes
Automatically, on your device
Your folders
Kept as you built them
Nesting
As deep as you like
Wrong folder?
Move it any time

Import

Switching is easy.

Export from your old app, point Prevon at the folder or .zip, and it works out what’s inside and brings your notes in. Anything it can’t use is listed with the reason, so nothing goes missing quietly.

Note apps
Notion, Evernote, Google Keep, Obsidian, Bear, Apple Notes
Plain files
Markdown, text and HTML
What you pick
One export folder or .zip
Skipped files
Listed, with the reason
Your old app
Not modified by the import

Your key

One key, and it’s yours.

Your vault key is made from a 12-word phrase. We do not store the phrase and there is no password on our side. Anyone who has your phrase and a copy of your vault files can read the notes, so keep the phrase on paper, and keep it private. Optional extra unlocks (PIN, fingerprint, hardware key) sit on top of it.

Your key
A 12-word phrase
Kept by us
No
If you lose every way in
We cannot recover the notes

Every device

On every device you own.

One app built for Windows, macOS, Linux, Android and iOS. Keep notes on one device or pair two devices directly. Encrypted sync is built but switched off in the beta, and the non-Android builds have not been independently audited.

Platforms
Windows, macOS, Linux, Android, iOS (beta)
Sync
Planned, designed to be end-to-end encrypted; off in the beta
Without the cloud
Pair two devices directly
Price
Free in the beta; sync pricing not final

Free for everyone.

The app is free to use, with no account. Ghost Cloud, our optional sync and backup service, is not launched yet. Its first launch is planned as a free monthly allowance; paid plans are not final. The app has no ads and no trackers or analytics.

Apply for the beta