MRDown
A Mac Markdown editor that keeps a timestamped diff history of every save — including edits an AI agent made while you weren't looking.
🔗 Visit MRDown
Description
If you edit a Markdown file by hand while an AI agent is also allowed to rewrite that same file, you've probably had the sinking feeling of realizing your unsaved changes and the agent's changes just collided — and it's not obvious what actually happened to either version. MRDown is a native macOS Markdown editor built around exactly that failure mode, treating every save (yours or an external tool's) as a point in a version history you can inspect and diff.
MRDown keeps a timestamped snapshot of every save and every external rewrite to a file, and when it detects that an agent modified a file on disk while you had unsaved edits open, it shows a three-column diff — your last save, what's now on disk, and your current unsaved edits — so you can manually reconcile the conflict instead of silently losing work. Beyond that core safety feature, it's a fully-featured Markdown editor: live preview, syntax highlighting, Mermaid diagrams, KaTeX math, tables, YAML frontmatter, multi-document tabs, find-and-replace across documents, .docx-to-Markdown import, and export to self-contained HTML or PDF. It's built with Tauri and TypeScript, distributed as a signed, notarized macOS binary, and the core editor is MIT-licensed — a planned paid tier will add AI-powered diff explanations and project-wide search in a separate module.
💬 Our review
The short version: if you write Markdown by hand while also letting an AI agent edit the same files, MRDown's three-column conflict diff solves a real, specific data-loss problem that generic Markdown editors like Typora or iA Writer don't address at all — the tradeoff is it's a brand-new project (1 GitHub star) built by essentially one developer, on macOS only.
Against a general Markdown editor like Typora or iA Writer, MRDown's real differentiator isn't the editing experience (which is competent but not exceptional) — it's the version history and conflict-detection layer built specifically for the world where a file can change underneath you without you touching it. Against just using Git to track your Markdown files, MRDown's history lives in its own app-local data directory rather than your repo, which is more convenient for non-versioned notes but means the history doesn't travel with the file if you move it. The core editor being fully MIT-licensed (with paid features planned for a separate module) is a reasonable open-core structure that doesn't cripple the free version. Worth trying specifically if you've been burned by an AI agent silently overwriting a Markdown file you were editing; if that's never happened to you, any competent Markdown editor will do.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Éditeur principal gratuit (MIT) ; palier payant prévu pour l'explication de diff par IA et la recherche multi-projets.
Pros
Diff à trois colonnes spécifique aux réécritures par agent IA
Éditeur complet : Mermaid, KaTeX, tableaux, frontmatter YAML
Import .docx et export HTML/PDF autonome
Éditeur principal gratuit et MIT, binaire signé/notarié natif (Tauri)
Cons
macOS uniquement malgré un code Tauri multiplateforme
Projet très récent et modeste (1 étoile GitHub, quasi solo)
Historique stocké localement dans l'app, non portable avec le fichier contrairement à Git