Everything about FlashType - the free, open-source macOS markdown editor with Claude Code and Codex built in. Can't find your answer? Open an issue on GitHub.
FlashType is a free, open-source markdown editor for macOS with Claude Code and Codex built in. Open any folder of local .md files, write in rich text that renders live as you type, and let AI agents edit alongside you - every change shown as an inline diff you accept or reject. Built by Opral.
Anyone who works in markdown: developers, technical writers, product managers, and note-takers who want AI help drafting and editing without giving up control of their files.
Two things: agents (Claude Code and Codex) run in a pane next to your document and edit the same files, and every AI change lands as a reviewable inline diff. You keep portable .md as the source of truth.
FlashType is built in TypeScript and open source under the MIT license. Its version history and diffs run on Lix, an open version-control system that can track any file format.
Run Claude Code or Codex in a pane beside your draft. The agent reads and edits the same local files - no copy-paste. Each change appears as an inline diff right in the document.
Yes - that's the core idea. Agent changes land as inline diffs. Accept the good ones, reject the rest. Nothing changes without you seeing it first.
No. FlashType runs the real agents underneath and adds a visual editing and review layer - rich-text editing, inline diffs, and version history - on top of them.
Yes - you bring your own Claude Code or Codex access (subscription or API key). FlashType itself is free.
Yes. It's a full WYSIWYG markdown editor on its own - headings, lists, and links render live as you type. The agents are optional.
Yes. Point it at any folder on disk - notes, docs, or a repo. Every document stays a plain .md file. No sync service, no proprietary format, no lock-in.
Plain markdown - .md and .markdown files.
Your files stay on your machine as local markdown. There's no proprietary cloud format. When you use an agent, content is sent to your chosen AI provider (Anthropic or OpenAI) under their terms, just like using the CLI directly.
Yes. Every change is checkpointed automatically via Lix. Browse a document's full history and restore any earlier version - yours or the agent's - in one click. (Version history is rolling out.)
Yes - completely free. You only need your own Claude Code or Codex access for the AI features.
Yes, released under the MIT license. The source lives at github.com/opral/flashtype.
Absolutely. Issues, pull requests, and stars are welcome on GitHub, and you can join the community on Discord.
macOS today. Windows and Linux aren't available yet.
Download the latest macOS build from the releases page or flashtype.com, then open a folder of markdown files to start writing.