Building Tools with Purpose
Personal apps designed to enhance productivity and enrich hobbies
Zin Flow
URL to EPUB Converter
Turn any web article, documentation, or blog post into a beautifully formatted EPUB ebook in seconds. Zin Flow intelligently extracts the main content, preserves formatting, and delivers a clean reading experience on Kindle, iPhone, iPad, and any EPUB-compatible device. Perfect for saving long reads, building a personal digital library, and reading offline — without distractions.
DownMark for iOS
Web-to-Markdown for iPhone & iPad
Turn web pages into clean Markdown from Safari or the Share Sheet. Keep converted articles together, preview the rendered result, save them for offline reading, sync through iCloud, and export Markdown whenever you need it.
DownMark for Mac
Safari & Chrome Web-to-Markdown for Mac
Extract the main content from web pages, convert it to clean Markdown, and save local files directly from Safari or Chrome. Keep links and structure intact, localize images, and choose exactly where every Markdown file belongs.
SubEnvoy
AI Subtitle Translation
Professional AI subtitle translation for local videos. On-device Whisper transcription, 10+ language support, privacy-first.
Zin Feed
RSS to EPUB Converter
Transform your RSS feeds into beautifully formatted EPUB and PDF e-books. Perfect for Kindle and other e-readers with flexible grouping options - create daily, monthly, or yearly reading collections from your favorite RSS content.
Yist
GitHub Gist Manager
Seamlessly manage your GitHub Gists with local sync support. Create, edit, and organize your code snippets, use collections, and enjoy syntax highlighting and draft support.