I’m building LitSquare Ink MD, a native macOS Markdown editor for prompt/docs workflows. It’s file-first with fast live preview, code blocks, and KaTeX/Mermaid support.
I also care about prompt ergonomics, so it includes a token counter (for GPT-style tokens) plus a diff-view workflow to sanity-check changes before applying.
It’s still under heavy development, so feedback is welcome. https://ink.litsquare.com