The whole idea
Prevon is an encrypted notes app with an AI that lives on your device.
Ask it something you half-remember and it answers from what you wrote — and in the current build the AI does not send your notes to a server. Here's the whole thing in three ideas. No jargon, no marketing.
Type what you half-remember. Get the note back.
Two of the four results below share none of the words you typed. They come back anyway — the search matches meaning, not just text, and in the current build it runs on your device rather than ours.
Library
BIO 201 — exam 3 review
2:14 PMMitochondria → ATP production, Krebs cycle diagram. Prof said unit 4 is ~40% of the final, so start there.
Cell biology — week 3 lecture
YesterdayCristae fold up to pack more surface area for aerobic respiration.
Study group — Monday
MonPriya’s trick for remembering the mitochondria steps — ask her to redo that before the exam.
Reading — cellular respiration
Aug 30Glucose breaks down into roughly 32 ATP before a cell can use it.
4 notes match. Scroll, or open the top one.
01
Your notes are yours. Not ours.
Every note is designed to be locked on your device before it goes anywhere. In a standard vault the key comes from your 12-word — we do not have a copy of it and cannot reset it. If you lose it (and every other way in), we cannot recover your notes. There is no "forgot password" flow by design. Notes that reach our servers are designed to be stored as we cannot decrypt. (Sync is switched off in the private beta.)02
The AI works for you, not on you.
The AI finds, organizes, and auto-files your notes by what they mean, not just the exact words you typed. It runs on your device, so in the current build your notes do not have to leave it to be understood. Reading is automatic. Auto-filing a new note is instant; anything bigger, like merging or re-filing, asks you first, and the AI never deletes without asking. And every move it makes is logged in plain language you can read.03
There’s more coming. You pick what.
Most apps glue a feature onto somebody else's cloud. We built the private on-device engine first — the hard part, the part everything else stands on — and it's built. So what comes next isn't a from-scratch gamble. It's a short build on finished ground. Short enough that it's genuinely worth asking you what you want.Vote on what we build next