Open local
markdown files
Point Flashtype at any folder on your disk - your notes, docs, or a repo. Every document is a plain .md file. No sync service, no proprietary format, no lock-in.
Flashtype features
Open local
Rich text editing
Headings, lists and links render live as you type - no split preview, no markdown syntax in your face. It reads like the finished page while you write.
Claude & 
Codex
built in
Run Claude Code or Codex in a pane next to your draft. They read and edit the same files - no copy-paste, no context juggling.
Diffs
Agent changes land as inline diffs right in your document. Accept the good ones, reject the rest - nothing changes without you seeing it.
Soon
Version history
Every change is checkpointed automatically. Browse a document's full history and restore any earlier version in one click - yours or the agent's.
Powered by
Flashtype's version history and diffs run on Lix. Every edit is checkpointed, so you can see what changed and go back to any version.
Explore LixFAQ
What is Flashtype?
Flashtype is a free, open-source macOS markdown editor with Claude Code and Codex built in.
Does Flashtype work with local files?
Yes. Open any folder on disk and keep writing in plain .md files without a proprietary format.
How are AI edits reviewed?
Claude Code and Codex can edit the same files, and Flashtype shows their changes as inline diffs before you accept or reject them.
Free & open source
Built in the open. Issues, pull requests and stars welcome.
macOS · MIT license