YZH Studio crafts high-craft Android utilities with 100% client-side SQLite storage, local AI intelligence, and zero tracker SDKs. Your data never leaves 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.
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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 AdMob for revenue sustainability, but with strict privacy controls: no personalised ad tracking, no behavioural fingerprinting. Ads are contextual — never creepy.
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 non-personalised ads with GDPR/CCPA controls. Your browsing behaviour is never used for ad targeting.
Each app has its own dedicated policy: Link Vault and Compare Value.