Obsidian is the default answer for “markdown editor” — but it isn't fully open source and has no coding agents inside it. FlashType is free, MIT-licensed, and runs Claude Code and Codex right next to your local .md files. Agents edit, you review every change as a diff, nothing lands until you accept it.
Obsidian is the better choice for building a large, interconnected personal knowledge base — its graph view, backlinks, and plugin ecosystem are unmatched. FlashType is the better choice for editing local markdown with open-source software and AI agents built in, particularly its MIT license, Claude Code and Codex working directly on your real files, and an inline diff you accept or reject for every change.
Both edit plain local .md files. The difference is what FlashType adds on top — open-source code and coding agents that edit your files with reviewable diffs.
| Capability | FlashType | Obsidian |
|---|---|---|
| Edit your local .md files directly | ||
| Fully open source (MIT license) | — | |
| Claude Code & Codex built into the editor | — | |
| Agents read & edit your real files | Plugins | |
| Review every AI change as an inline diff | — | |
| Accept or reject edits one by one | — | |
| Automatic version history | Paid Sync | |
| Free for commercial use | Paid | |
| Graph view, backlinks & plugin ecosystem | — |
FlashType is better for writers who want AI agents working directly on their files: Claude Code and Codex are built in, every edit is a reviewable diff, and the whole app is MIT-licensed. Obsidian is better for building a large interconnected knowledge base with its graph view and plugins.
Both edit local .md files, but FlashType is fully open source and ships with Claude Code and Codex inside the editor, showing every agent change as an accept-or-reject diff. Obsidian is closed source, has no coding agents built in, and centers on linked notes, a graph view, and a community plugin ecosystem.
FlashType is free and open source under the MIT license, including for commercial use. Obsidian is free for personal use but charges for a commercial license and for paid add-ons like Sync and Publish, so FlashType costs less for most professional setups.
FlashType can replace Obsidian for drafting and editing markdown with AI agents, since both work on plain local .md files you can move between tools. It does not replicate Obsidian's graph view, backlinks, or large plugin ecosystem, so heavy knowledge-base users may keep both.
People building a dense personal knowledge base should use Obsidian, where the graph view, backlinks, and thousands of community plugins are the main draw. FlashType is the better fit when the priority is open-source software and AI coding agents editing your files with reviewable diffs.
FlashType is open source under the MIT license, so its code is public and auditable. Obsidian's app is closed source, but both store your writing as plain .md files on disk, so your content stays portable even though the editor itself is not open.
Built in the open. Issues, pull requests and stars welcome.