Uteke — Your Second Brain, 100% On-Device

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  Work in airplane mode

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  Finds by meaning

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  Pro, the honest way

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  Your Second brain

Inspiration

Notes are the most personal data we own — yet most note apps quietly sync them to someone else's cloud. We asked a simple question: what if a "second brain" could be genuinely yours? Not an account. Not a subscription to your own thoughts. Just your memories, living and running on your phone.

What it does

Uteke is a semantic notes app that runs 100% on-device:

• Capture memories by voice or text — transcription happens on the phone
• Find them by meaning, not keywords — typing "hello" surfaces "Hi" and "Hey" (99% match), no exact words needed
• Organize with rooms and collections
• And the proof shot of our demo: turn on airplane mode — search and recall still work. Zero network.

The free tier is real: capture, search, collections — free forever. Uteke Pro removes the ceilings: unlimited voice dictation, unlimited export, automatic backups.

How we built it

• Flutter app with a local Rust core for semantic memory and search, accessed via FFI — inference runs inside the app process, not on a server
• On-device embeddings power meaning-based recall; storage is local, there is no cloud sync to turn off
• RevenueCat (purchases_flutter) drives the entire monetization layer: a single pro entitlement, prices fetched live from RC Offerings (never hardcoded in the app), a 7-day free trial, and instant Pro unlock without an app restart

Challenges we ran into

Making semantic search fast enough to feel instant on a phone — and then proving it. The airplane-mode toggle in our demo video isn't a stunt; it's the default condition we designed for. The other challenge was honest monetization: real limits with visible counters, no dark patterns — hit a ceiling, and Uteke simply asks.

Accomplishments that we're proud of

A privacy story that doesn't ask you to trust us — there is nothing to trust, because nothing ever leaves the device. And checkout that respects the same promise: handled natively by Google Play through RevenueCat, unlock the instant you confirm.

What we learned

On-device AI is a product decision, not just an architecture. Every feature got easier to trust and harder to fake — which is exactly the bar a personal notes app should clear.

RevenueCat integration (for judges)

• One entitlement (pro) mapped across monthly & yearly plans, configured in RC
• All paywall prices render from RC Offerings — zero hardcoded prices
• 7-day free trial (intro offer) so you can test premium features free
• Sandbox-purchased live in the demo video: tap → Play sheet → confirm → Pro unlocks instantly, no restart
• Restore purchases supported in-app

Built With

• dart
• embeddings
• ffi
• flutter
• google-play-billing
• offline-first
• on-device-ai
• privacy
• revenuecat
• rust
• semantic-search