YAMP is Yet Another Markdown Previewer, because when you're dealing with Claude Code you always have to open markdown files — and I couldn't find anything simple that would just open them. Everything else had too many features or took too long to load.

So I threw this together. It renders GitHub-flavored Markdown, Mermaid diagrams, math, and syntax-highlighted code. Save in your editor and YAMP updates instantly. The whole thing is about 5 MB.

It's open source and free on GitHub. If you want to throw me a dollar, it's on the App Store too. I hope you enjoy it.