In Closed Testing on Google Play

Capture book highlights at the speed of thought

A minimalist, privacy-first native Android app bridging physical reading with digital notes. Built with Jetpack Compose, on-device ML Kit OCR, and 100% offline Whisper speech transcription.

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ML Kit OCR
Zero-latency camera scan
Kubun Notes Library View
🎙️
Whisper.cpp STT
100% offline voice transcription

Built by Kubun Labs

A family of high-performance, model-augmented Android applications designed for privacy, speed, and fluid utility.

Current Project
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Kubun Notes

Minimalist book note taker & library manager with OCR passage scanning, offline speech transcription, and passage highlighting.

In Production
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Kubun Translate

Dual-screen simultaneous translator for Android. Uses low-latency STT and TTS models for seamless face-to-face natural speech conversation.

Internal Tool

Kubun Dictate

Self-hosted client-server Whisper flow with GPU backend acceleration for system-wide voice dictation across mobile and desktop.

Designed for physical book lovers

Every feature is crafted to remove friction between reading on paper and building your personal knowledge vault.

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On-Device Camera OCR

Point your camera at any book page to instantly extract precise sentences or paragraphs using standalone Google ML Kit Text Recognition.

🎙️

Offline Whisper Voice Notes

Dictate your thoughts without sending audio to external servers. Powered by an embedded whisper.cpp engine with model selection.

In-Note Passage Highlighting

Re-read and highlight memorable quotes directly inside saved notes with dynamic content re-anchoring on edits.

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Privacy-Preserving AI Recs

Get personalized book suggestions based on your library and ratings. Powered by Mistral via Cloudflare Worker edge proxy. Notes are never sent.

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Multi-Source Catalog Search

Instant search and ISBN barcode scanner orchestrating Open Library and Google Books with high-res cover art resolution.

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100% Local & Encrypted Backups

No user account required. Automatic dated daily backups exported straight to local storage with embedded base64 cover art.

Inside Kubun Notes

A visual tour of the Material 3 UI built exclusively with Jetpack Compose.

Library View

Library Overview

Organize all your physical books with reading status tracking (Reading, Want to Read, Read), star ratings, and instant cross-book search.

"Me mudé el jueves pasado... He cerrado tantas maletas en mi vida, me he pasado tantas horas haciendo equipajes..."

Technical Architecture & Stack

Built following Google's official Android Architecture Guide with Clean Architecture and MVVM/UDF pattern.

Jetpack Compose
Declarative UI + Material3 design & animations
Kotlin Coroutines & Flow
Asynchronous execution & reactive state flow
Room DB v8 + FTS4
Local database persistence & full-text note search
Dagger Hilt
Dependency injection across domain & data modules
whisper.cpp
Offline C++ speech recognition engine integration
ML Kit OCR
Standalone camera text recognition engine
Cloudflare Workers
Edge API orchestrator & AI recommendation proxy
Coil 2.6
High-performance cover image loading & caching

Releasing Soon on Google Play

Kubun Notes is currently in closed testing with active testers. Public release expected within the next month.