Things I’ve built

An open-source TeslaMate client for iPhone with live telemetry, trip history, and battery analysis.

• iOS
• Open source
• Data

Free, ad-free tutorials for 70+ programming languages, frameworks, databases, and infrastructure tools.

• Web
• LLM

Open-source programming tutorials in Chinese, with more than 19,000 pages across 70+ topics.

• Web
• LLM

Offline trail maps for iPhone, with downloadable map regions and GPS tracking.

• iOS
• Maps

A document scanner for iPhone with perspective correction, OCR, and searchable PDF export.

• iOS

An ESP32 desk clock with four time zones, market hours, weather, holidays, and touch controls.

• Hardware
• Open source

A Wi-Fi weather display with a 4.2-inch e-paper screen, Open-Meteo data, and web-based configuration.

• Hardware
• Open source