OpenMark
AI agents write markdown. OpenMark makes it beautiful.
What it does
A beautifully simple native markdown editor for macOS Tahoe. Mermaid diagrams, LaTeX math, Liquid Glass design. Openmd files and see them rendered instantly. $9.99 one-time purchase. Limited time $5.99. Hit #1 on the App Store Developer Tools
Does a similar job
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Write.md – A free, open-source, themeable Markdown editor for macOS27d ago · writemd.app · ▲107A free, open-source Markdown editor for macOS with customizable appearance profiles, optional Vim keys, and local writing corrections.
OpenKnowledge – open source AI-first alternative to Obsidian/NotionJun 2026 · github.com · ▲381Hi HN, Nick here. We’re launching OpenKnowledge (https://openknowledge.ai/), a “what you see is what you get” markdown editor that has direct integrations with Claude, Codex, and other agents. Available as MacOS app or Web UI+CLI. Fully free/local and OSS. We built this because we wanted a Notion-like experience for writing and sharing markdown files across our team. Obsidian is the best alternative we tried, but found it doesn’t have a true WYSWIG UI and it didn’t integrate well with Claude/Codex outside of community plugins. So we built OpenKnowledge. It takes…
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