Tools
Developer Erduo Skills Skills I use every day in Claude Code and Codex: RSS digests, translation polish, Gemini watermark removal. 
Content X Long-form Card Turn long text into a 1080×1440 X-style mobile card with name, avatar, metrics, and optional screenshot. 
Developer Card CLI Mockup A terminal-style card with direct in-place editing. 
Utility Gemini Watermark Remover Upload a Gemini image, remove the visible bottom-right watermark locally, and download the result instantly. 
Developer JSON Diff Compare two JSON inputs with key sorting and highlighted diffs. 
Content MarkPix Turn Markdown into social cards with multiple themes and HD export. 
Content MarkWx Convert Markdown to WeChat-ready layout with themes and code highlighting. 
Developer Timestamp Pro Convert between timestamps and dates with seconds, milliseconds, and ISO format support.
Content X Long-form Card Turn long text into a 1080×1440 X-style mobile card with name, avatar, metrics, and optional screenshot. Developer Card CLI Mockup A terminal-style card with direct in-place editing. Utility Gemini Watermark Remover Upload a Gemini image, remove the visible bottom-right watermark locally, and download the result instantly. Developer JSON Diff Compare two JSON inputs with key sorting and highlighted diffs. Content MarkPix Turn Markdown into social cards with multiple themes and HD export. Content MarkWx Convert Markdown to WeChat-ready layout with themes and code highlighting. Developer Timestamp Pro Convert between timestamps and dates with seconds, milliseconds, and ISO format support.