Markdown editors are a crowded, mostly-solved category — until you start letting AI coding agents write into the same repo where your notes and docs live, and files start changing without you having touched them. That's the specific problem MRDown was built around, next to Typora, the editor that's quietly been the reference for "clean Markdown with live preview" for years. They overlap on the basics but solve for different worries.
Typora: the established, minimal live-preview editor
Typora's pitch hasn't changed since it first got popular: a genuinely minimal interface with seamless live preview, so you're writing formatted text without ever staring at raw asterisks and hash marks. It offers a 15-day free trial, then a one-time $14.99 license usable on up to 3 devices — no subscription.
Who it's for: anyone who wants a clean, distraction-free Markdown editor across their devices, and would rather pay once than deal with a subscription or self-managed history.
The catch: it's surprisingly under-the-radar for how good it is (a marketing problem more than a product one), and it has no real-time collaboration — it's a single-user writing tool, not a docs platform.
MRDown: for tracking what an AI agent changed while you weren't looking
MRDown is a free, MIT-licensed Mac Markdown editor (built on Tauri, signed and notarized) whose standout feature is a three-column diff view built specifically to show what changed between your saves — including edits made by an AI coding agent working in the background. Beyond that, it's a fully-featured editor: Mermaid diagrams, KaTeX math, tables, YAML frontmatter, .docx import, and standalone HTML/PDF export. A paid tier is planned for AI-powered diff explanations and multi-project search, but the core editor stays free.
Who it's for: developers who write Markdown docs or notes inside a repo an AI agent also touches, and want a lightweight local audit trail without setting up Git for a folder of notes.
The catch: it's macOS-only despite being built on a cross-platform framework, it's a very young and small project (essentially a solo effort, low GitHub star count at the time of writing), and its save history lives inside the app rather than traveling with the file the way Git history would — so it's not a Git replacement, just a lighter-weight safety net.
MRDown vs Typora at a glance
| Criteria | MRDown | Typora |
|---|---|---|
| Price | Free, open source (MIT); paid tier planned for AI diff explanations | 15-day trial, then $14.99 for up to 3 devices |
| Standout feature | Three-column diff history, built for AI-agent edits | Seamless live preview, minimal UI |
| Extras | Mermaid, KaTeX, .docx import, HTML/PDF export | Cross-device license, minimal distraction-free writing |
| Platform | macOS only | Multi-platform |
| Maturity | Very new, small solo project | Established for years |
| Collaboration | None — local, single-user | None — local, single-user |
Verdict
Pick MRDown if you write Markdown in a repo that an AI coding agent also edits, you want a free way to see exactly what changed between saves, and you're fine with a young macOS-only tool that might be rough around the edges. It's solving a specific 2026 problem — Typora simply wasn't built for it.
Pick Typora if you want a polished, mature editor for general Markdown writing, you're on Windows or Linux as well as Mac, and a one-time $14.99 license beats managing a newer open-source tool. If you want something closer to a full notes app instead of a pure editor, iA Writer is worth a look too.