YZH Studio crafts high-craft Android utilities with 100% client-side SQLite storage and on-device intelligence. Your personal database records never leave your device.
Built for people who value privacy, offline-first reliability, and analytical precision.
Save · Organise · AI Summarise | The Private AI Bookmark Vault
Save any link or text snippet with 1 tap. Features Ask My Vault (Hybrid Semantic RAG assistant), a bring-your-own-key Model Hub (Gemini, Claude, GPT-4o, DeepSeek, local Ollama), automated 404 & duplicate health audits, and 100% free Google Drive cloud sync.
Shop smarter. Pay less. | Value Compare
Stop doing grocery store math in your head. Automatically normalizes mass, volume, and counts to 4 decimal places. Includes camera OCR price tag & table scanner, live shopping cart budget progress bar, and "Life Value" priority multipliers.
No install needed — test the core unit price normalizer right in your browser. The mobile app adds camera OCR scanning, smart shopping cart, SQLite price trend charts, and Cairo PDF exports.
Compare Value
Unit price calculator
Every line of code we write answers to three non-negotiable commitments.
Every byte of your data lives exclusively in SQLite on your device. There are no servers, no cloud sync, no data brokers. Your links, your prices, your choices — cryptographically yours alone.
Native Android performance with no JavaScript bridges, no React Native overhead. Direct SQLite queries execute in microseconds. Your app is instant because it doesn't wait for anyone's server.
We use Firebase Analytics and AdMob with strict privacy controls to improve stability and support development. Your personal database, saved links, and calculations remain 100% isolated on your device.
Feedback, bug reports, or questions about our apps — we read every email personally.
Quick answers
No. All data is stored exclusively in SQLite on your device. We have no servers that receive your personal data.
Yes. Core features work completely offline. AI features may require internet for model inference only — never for your data.
We use Google AdMob (with Non-Personalised Ads) and Firebase Analytics for app stability and crash metrics. Neither Google nor our servers have access to your SQLite database, bookmarks, AI summaries, or shopping calculations. Your data remains 100% on your device.
Each app has its own dedicated policy: Link Vault and Compare Value.