MuM
A reading-first Markdown engine for macOS
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Your Markdown lives in a dozen folders. Most of the time you don't want to write — you just want to read one section. Every Markdown tool is a writing app with a preview pane. MuM is the opposite: a native macOS reader with no web engine inside — all AppKit. Several projects open at once, each remembering where you stopped. Cross-project search. Typesetting tuned for CJK as well as Latin. ~0.3s cold start, 1.7 MB download, 100+ fps scrolling a 5 MB document. Open source, MIT.
PH · launched Sep 28, 2026 · 93 upvotes (top 2%) · 0 views
Niche: markdown editors and viewers · 158 launches, 13 in the last 7 days ▲ +86% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Prosumer
- Not AI
- Commercial product
- Open Source
- Developer Tools
- GitHub
Visit website ↗ Source listing ↗
More like this: all 158 launches in markdown editors and viewers →
Could you build this?
Partial Parsing and viewing markdown is simple, but building a 100% native AppKit macOS application with custom text layout engine (explicitly avoiding WebKit/Electron) requires specialized Apple ecosystem knowledge.
What it would actually take: The app requires native Swift and deep AppKit/TextKit 2 expertise to parse CommonMark into an attributed string hierarchy and handle custom AST-driven typographic layout without relying on WKWebView. A developer must have specialized macOS desktop engineering experience.
Competitors
Other products that read as similar to this one : 478 launches clear the similarity bar, closest 8 shown.
Attention rank: #15 of 479 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 305 days after the earliest competitor.
- Markdown for Mac · ph · 2026-10-24 · 1 upvotes · similarity 0.64
- Tim's Markdown Reader · ph · 2026-09-22 · 2 upvotes · similarity 0.59
- MarkRead – Markdown Reader · ph · 2026-10-22 · 2 upvotes · similarity 0.55
- Lisible · ph · 2026-10-11 · 1 upvotes · similarity 0.53
- A fast, offline Markdown viewer for macOS built in Swift · hn · 2026-09-22 · 8 upvotes · similarity 0.53
- macOS Native Markdown Reader with Vim Keybinding Using Swift · hn · 2026-06-29 · 7 upvotes · similarity 0.51
- Plainkeep · ph · 2026-11-01 · 2 upvotes · similarity 0.51
- Markly · ph · 2026-09-25 · 62 upvotes · similarity 0.51
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