MacMD ViewerMacMD Viewer vs MDHero: Free Open Source or Paid Reader (2026)
MDHero is free, open source and actively developed, and it does things MacMD Viewer does not: math, editing, Marp slideshows, Windows and Linux builds, and since September 2026 a Finder Quick Look preview as well. MacMD Viewer is the answer if your Mac has an Intel processor, which MDHero does not support yet, or if you want a reader that cannot write to your files, with 12 document themes and a paid developer behind it.
MDHero is free, MIT-licensed, under 8 MB, renders math and now has Quick Look, but runs on Apple Silicon only. Where each app wins, checked November 2026.
How Does MacMD Viewer Compare to MDHero?
| Feature | MacMD Viewer | MDHero |
|---|---|---|
| Price | $19.99 one-time | Free, MIT licence |
| Intel Mac support | Yes — universal binary | No — Apple Silicon only, Intel listed as coming |
| Quick Look preview in Finder | Yes | Yes — since v0.2.10 (September 2026) |
| Minimum macOS | 14.0 | 12.0 |
| Read-only | Yes, by design — it cannot alter your file | No — View, Split and Edit modes, ⌘S saves |
| LaTeX / math | No | Yes (KaTeX) |
| Mermaid diagrams | Yes — bundled, offline, also inside Quick Look | Yes |
| Document themes | 12 built-in | Follows the system light and dark appearance |
| Syntax highlighting languages | ~34 | 25+, per its own site |
| Version | 1.8.x | 0.2.10 — pre-1.0 |
| App size | 5.4 MB DMG, 16 MB installed | Under 8 MB |
| Platforms | macOS only | macOS, Windows, Linux |
| Slideshows | No | Yes — `marp: true` in the front matter opens the file as a deck |
| Support | One paid developer answering email | GitHub issues, MIT licence, no warranty |
MDHero's official site: mdhero.app/mac
$19.99 one-time · 14-day money-back · No subscription
What Does Each Tool Cost Over Time?
| Period | MacMD Viewer | MDHero |
|---|---|---|
| Purchase price | $19.99 | Free (MIT licence) |
| After 1 year | $19.99 | Free (MIT licence) |
| After 3 years | $19.99 | Free (MIT licence) |
Both MacMD Viewer and MDHero are one-time purchases. No recurring costs.
When is the free app enough?
If your Mac has Apple Silicon and you want math, editing or slides, MDHero is enough, and since v0.2.10 it previews Markdown in Finder too. The $19.99 buys an app that also runs on Intel Macs, a reader that never modifies the file it shows, 12 document themes, PDF export as one continuous page with Mermaid diagrams and highlighted code, and a developer who answers support email. A direct purchase is refundable within 14 days.
What Are the Pros and Cons?
MacMD Viewer
Pros
- +Runs on Intel Macs; MDHero is Apple Silicon only today
- +Quick Look extension — press Space in Finder and the document renders
- +12 selectable document themes rather than system light and dark
- +Mermaid ships inside the app and the Quick Look extension, so diagrams render with no network
- +Read-only by design, which means the app you use to read cannot save over the file
- +Paid support from a named developer, plus Setapp and Homebrew distribution
Cons
- -Costs $19.99 where MDHero costs nothing and is MIT-licensed
- -No math rendering; MDHero renders KaTeX
- -Requires macOS 14; MDHero runs on macOS 12
- -No editing at all — if you want to fix a typo you saw, you leave the app
- -No Marp slideshow mode, no Vim keybindings, no LLM paste cleanup
- -macOS only; MDHero also ships Windows and Linux builds
- -~34 syntax highlighting languages, and MDHero's source is auditable while MacMD Viewer's is not
MDHero
Pros
- +Free and open source under the MIT licence, 332 stars, last push 2026-10-24 (GitHub API, 2026-11-05)
- +Under 8 MB, native Apple Silicon build, Apple-notarized DMG
- +KaTeX equations and Mermaid diagrams
- +Quick Look preview in Finder since v0.2.10, math and diagrams included
- +A real editor built into the viewer — View, Split and Edit, with ⌘S and an unsaved-changes warning
- +LLM paste mode that strips the escaped newlines and stray backslashes AI output arrives with
- +Marp slideshows straight from a `.md` file, with no CLI and no browser
- +Runs on macOS 12, and also ships for Windows and Linux
- +Optional Vim keybindings and pinned project folders
Cons
- -Apple Silicon only — Intel support is announced as coming, not shipped
- -Version 0.2.10 — pre-1.0 software, with the stability expectations that implies
- -Appearance follows the system light and dark setting; there is no theme picker
- -No support contract; the MIT licence ships the software as is
- -Being an editor as well as a viewer means it can write to the file you opened to read
When Should You Choose MDHero vs MacMD Viewer?
Choose MDHero if:
- →You need to write and edit Markdown files, not just read them
- →You work across Mac, Windows, and Linux
- →You prefer a WYSIWYG or split-pane editing experience
Choose MacMD Viewer if:
- →You primarily read and review Markdown files, not write them
- →You want QuickLook preview: press Space in Finder to see any .md file rendered
- →You need Mermaid diagram rendering without plugins or configuration
- →You want a native macOS app that launches instantly and uses minimal resources
$19.99 one-time · 14-day money-back · No subscription
MacMD Viewer vs MDHero: which one should you install?
MDHero is free, MIT-licensed, under 8 MB, renders math and Mermaid, edits as well as reads, opens Marp slideshows straight from a .md file, and ships for Windows and Linux too. It is developed in the open at github.com/vaibhav-kakde-in/mdhero — 332 stars, last push 2026-10-24 (GitHub API, checked 2026-11-05). Since v0.2.10 it also adds a Quick Look preview in Finder.
It costs nothing and it is well built. Disclosure: this page is published by macmdviewer.com, which sells MacMD Viewer for $19.99. It covers the cases where paying makes sense anyway.
Who MacMD Viewer is built for
MDHero is built by a developer for developers — Vim keybindings, split editing, ⌘S, Marp decks, an MIT repository you can read. That is a coherent audience, and it is not entirely the same one MacMD Viewer serves.
About half the people who buy MacMD Viewer are not developers at all. One wrote: "I am not a developer and don't have other software on my computer besides TextEdit to work with MD files. Diving into the AI vibe coding world though…" Another: "AI loves producing markdown files during software development, and MacMD makes them easier to review."
So the segment is someone whose Mac filled up with .md files they did not write, produced by Claude, ChatGPT, Cursor or Copilot, who wants to read them from Finder without learning a tool — and who will never press ⌘E to edit one. If that description makes you think "I would absolutely edit it", MDHero is the better fit and it is free.
Case one: your Mac has an Intel processor
MDHero's download page is explicit — macOS 12 or later, on Apple Silicon, M1 through M4, with Intel support listed as coming (mdhero.app, checked 2026-11-05).
If your Mac is a 2019 MacBook Pro or a 2018 mini, that is the end of the comparison. MacMD Viewer ships a universal binary and runs on both architectures; MDHero, today, does not run on yours at all.
Note the trade in the other direction: MDHero supports macOS 12, and MacMD Viewer requires macOS 14. So on an Apple Silicon Mac stuck on Monterey or Ventura, the situation reverses exactly and MDHero is the one that installs.
Reading from Finder: no longer a difference
An earlier version of this page made Quick Look the second reason to pay. That stopped being true on 13 September 2026: MDHero v0.2.10 added a Quick Look extension, so Space in Finder renders the file in place, with math and Mermaid diagrams, without opening the app (MDHero release notes and mdhero.app, checked 2026-11-05). The same release made its DMG notarized and stapled.
MacMD Viewer has its own Quick Look extension, Mermaid included, so both apps now answer the spacebar. If that is all you wanted from a Markdown app and your Mac has Apple Silicon, MDHero does it for free.
Where MDHero is straightforwardly ahead
It renders math; MacMD Viewer renders none. It edits; MacMD Viewer is intentionally read-only. It ships for Windows and Linux, and MacMD Viewer has no announced version for either. It runs back to macOS 12 where MacMD Viewer requires 14. It cleans up the escaped newlines that AI output arrives with, which is a small feature that solves a real irritation. And its source is MIT-licensed, so you can read exactly what it does — which is not possible with MacMD Viewer at any price.
Where the difference is a design choice, not a score
MacMD Viewer is read-only and cannot be made to save. MDHero has View, Split and Edit modes with ⌘S. That is not a missing feature on MacMD Viewer's side; it is the product decision. An app you open to read a file your agent generated cannot overwrite that file if it has no way to write.
Whether that matters to you is a genuine question, not a rhetorical one. Some people want the typo fixed in the window where they saw it. Some people want the reading tool to be incapable of touching the source. There is no universal answer, and MDHero and MacMD Viewer picked opposite ones on purpose.
Version numbers, stated fairly
MDHero is at 0.2.10. MacMD Viewer is on its 1.8 line, on sale since March 2026. Pre-1.0 is the developer's own signal about maturity, and it deserves to be read as exactly that — not as a defect, and not as nothing.
The recommendation
Install MDHero if it runs on your Mac and you want to spend nothing, if you need math, editing, slideshows, or Windows and Linux builds.
Buy MacMD Viewer if your Mac is Intel, or if you want a reader that cannot modify your files, 12 document themes, and a developer paid to answer your email.
Related: MacMD Viewer vs Meva · vs Markdown Better View · vs QLMarkdown · all comparisons
Both apps render CommonMark-compliant Markdown with GitHub Flavored Markdown extensions including tables and task lists.
Frequently Asked Questions
Is MDHero really free?
Yes. It is free and open source under the MIT licence, developed in the open at github.com/vaibhav-kakde-in/mdhero — 332 stars, last push 2026-10-24, not archived (GitHub API, checked 2026-11-05). There is no paid tier.
Does MDHero work on an Intel Mac?
Not today. Its download page requires macOS 12 or later on Apple Silicon (M1 through M4) and lists Intel support as coming (mdhero.app, checked 2026-11-05). MacMD Viewer ships a universal binary that runs on both architectures.
Does MDHero preview Markdown in Finder with Quick Look?
Yes, since v0.2.10, released 13 September 2026. Installing MDHero adds a Quick Look extension that renders headings, tables, highlighted code, math and Mermaid diagrams when you press Space; you open MDHero once so macOS registers it (mdhero.app and its release notes, checked 2026-11-05). MacMD Viewer also ships a Quick Look extension, so this is no longer a difference between the two.
Which one renders math?
MDHero. It renders KaTeX equations; MacMD Viewer renders no math at all. If your documents contain equations, install MDHero.
Can MDHero edit Markdown files?
Yes — it has View, Split and Edit modes with ⌘E, ⌘S, line numbers and an unsaved-changes warning. MacMD Viewer is read-only by design and cannot modify a file. Which of those you want depends on whether an app that renders your documents should also be able to overwrite them.
Why buy MacMD Viewer when MDHero is free?
One concrete reason and two softer ones. Concrete: your Mac is Intel, and MDHero only runs on Apple Silicon. Softer: you want a reader that cannot write to the file, and 12 themes rather than system light and dark with a paid developer who answers email. If none of those apply, MDHero is free and good, and you should use it.
Is MDHero stable enough to rely on?
It is version 0.2.10, which the developer numbers as pre-1.0, and the repository was pushed to on 2026-10-24 with 45 open issues and pull requests (GitHub API, checked 2026-11-05). That is an actively worked project early in its life. The source is MIT-licensed, so unlike a closed app you can read it and judge for yourself.
Compare MacMD Viewer with other Mac Markdown apps
Ready to try MacMD Viewer?
MacMD Viewer is a native SwiftUI Markdown viewer: it renders any .md file with Mermaid diagrams, syntax highlighting and a Quick Look extension for Finder. $19.99 one-time, with no subscription and no account. See all MacMD Viewer features.
- Native on macOS
- 4.5 on Trustpilot
- On Homebrew & Setapp