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MRDown is a macOS-native Markdown editor for a world where AI agents edit your files. When an agent rewrites your Markdown, it shows exactly what changed — as a diff — instead of silently swallowing it. Touch the same lines as the AI and you get a 3-way view: you choose what stays, and the agent's version lands in history as an external rewrite, not the truth. See how a doc changed over time, compare any two files with ⌘⇧D, and pick up where you left off. Free, MIT-licensed, and truly native.
Hi Product Hunt 👋
I built MRDown because AI agents kept rewriting my Markdown files — and I had no good way to see what they changed, or to stop them from clobbering edits I'd just made by hand.
MRDown is a native macOS Markdown editor built around that problem:
See what the AI did, as a diff. When an agent rewrites a file, MRDown shows the change instead of just silently accepting the new content.
Don't get overwritten. When you and an agent touch the same lines, you get a 3-way view and choose — the AI's version lands in history as an external rewrite, not as the truth.
Diff across time, not just against one file.
Compare any two files with ⌘⇧D.
Remembers your reading position per document.
It's free, MIT-licensed, and macOS-native (not a web wrapper pretending to be an app).
Would genuinely love feedback from anyone working alongside coding agents — does seeing the diff change how much you trust them?
Finally a markdown editor that treats agent edits like real edits instead of magic. The 3-way merge view when you touch the same lines is genuinely clever and feels built for how I actually work now.
Hi Product Hunt 👋 I'm Hitoshi, the maker.
I build alongside coding agents all day, and they kept rewriting my Markdown files out from under me. I'd tick a box, the agent would rewrite the same section, and one of us would silently lose. I couldn't see what it had changed, and I couldn't stop it from clobbering my edits.
MRDown is a native macOS Markdown editor built around that one problem:
🟣 See what the AI did — as a diff. When an agent rewrites a file on disk, MRDown catches it and shows the change instead of silently reloading.
🟣 Don't get overwritten. When you and the agent touch the same lines, you get a 3-way view and choose. The AI's version isn't thrown away — it lands in history as an external rewrite.
🟣 Diff across time, not just against the last save.
🟣 Compare any two files with ⌘⇧D.
It's free, MIT-licensed, and truly native — not a web wrapper. Built with Tauri, and (fittingly) alongside Claude.
I'd genuinely love to hear from anyone else working with coding agents: does seeing the diff change how much you trust them? Happy to answer anything in the comments 🙏
About MRDown on Product Hunt
“Read the Markdown your AI just rewrote ”
MRDown was submitted on Product Hunt and earned 0 upvotes and 4 comments, placing #46 on the daily leaderboard. MRDown is a macOS-native Markdown editor for a world where AI agents edit your files. When an agent rewrites your Markdown, it shows exactly what changed — as a diff — instead of silently swallowing it. Touch the same lines as the AI and you get a 3-way view: you choose what stays, and the agent's version lands in history as an external rewrite, not the truth. See how a doc changed over time, compare any two files with ⌘⇧D, and pick up where you left off. Free, MIT-licensed, and truly native.
MRDown was featured in Mac (103.6k followers), Open Source (68.6k followers) and Developer Tools (515.9k followers) on Product Hunt. Together, these topics include over 98.6k products, making this a competitive space to launch in.
Who hunted MRDown?
MRDown was hunted by TABATA,Hitoshi. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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TABATA,Hitoshi