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 — without a word of it going 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 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.
Your notes are yours. Not ours.
Every note gets locked on your device before it goes anywhere. The only key is your 12-word — we never see it, never store it, and can't reset it. There's no "forgot password" back door, because a back door would mean someone other than you can get in. If our servers were broken into tomorrow, an attacker would find and nothing else.
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 by default, so your notes never have to leave it to be understood. Reading is automatic. Anything that changes or deletes something asks you first, and every move it makes is logged in plain language you can read.
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 done. 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