Clean, distraction-free reading
Beautiful rendering with full CommonMark support. Headings, lists, tables, and code blocks all feel native, so you can just read.
Full CommonMark
01Pure Swift · Native on macOS
Your Mac still can’t read Markdown.
Now it can.
Double-click any .md and it opens beautifully rendered — not as raw symbols in TextEdit. One click to edit, ⌘S to save. The whole app is under 5 MB, fully offline, and respectful of your Mac.
Under 5 MB · pure Swift
US$3.99 one-time
Fully offline · no tracking
Toggle editing
⌘ ⇧ E
Save
⌘ S
Data collected
0 · fully offline
Full support
CommonMark ✓
Made for the .md files you already have
- ChatGPT & Claude exports
- GitHub READMEs
- AI coding-tool output
- Docs from your team
- Notes & drafts
Everything included
Markdown, kept simple and pleasant
Reviewing notes, reading documentation, or writing your next draft — every feature is built for “open it, use it, get on with your day.”
Read ⇄ edit in one click
Hit ⌘⇧E to jump into raw Markdown, save with ⌘S, and flip back to reading. No more separate reader and editor apps.
⌘⇧E / ⌘S
02Under 5 MB, opens instantly
Pure Swift, no Electron. The entire app is smaller than a single photo, launches in a blink, and scrolls big documents smoothly.
No Electron
03Automatic light & dark mode
Follows your system appearance with careful contrast that stays easy on the eyes — code blocks and tables tuned for both modes.
Light / Dark
04Fully offline, zero tracking
No internet connection, no account, no analytics, no third-party SDKs, no ads. TronDown collects no data — your documents never leave your Mac.
0 data collected
05Large files & mixed languages
Built in pure Swift for a lightweight, responsive feel. Big documents scroll smoothly, and CJK, Arabic, Hebrew, and Thai all render correctly.
CJK · RTL · Thai
06 In-app screenshots
Every screen, clean and quiet
A native macOS window with carefully tuned contrast in light and dark — this is the TronDown you will see every day.
01
Reading mode
Open any Markdown file and see it beautifully rendered, instantly
02
Editing mode
Toggle raw Markdown with ⌘⇧E, save with ⌘S, and flip back to reading
03
World scripts
CJK, Arabic, Hebrew, Thai, and more all render correctly
Three steps
Open. Read. Done.
01
Open
Double-click any .md file or drop it onto TronDown. No setup, no waiting — beautifully rendered right away.
Drag & drop · double-click
02
Edit when you want
Press ⌘⇧E (or click the toolbar button) to switch to raw Markdown. A clean, monospaced editor for focused changes.
⌘⇧E to toggle
03
Save and keep reading
Save with ⌘S and flip back to reading mode. Files are read and written locally only — that’s the whole workflow.
⌘S · fully offline
Private by default
Your documents never leave this Mac
TronDown collects no data. No account, no cloud, no ads — because it never connects to the internet in the first place.
0
network connections — the app never goes online
0
data collected — no analytics, no tracking, no third-party SDKs
100%
of your files stay local — read and written only when you open or save
FAQ
Questions, answered
How much does TronDown cost?
US$3.99, one-time purchase. No subscription, no in-app purchases, no ads — buy it once and it is yours.
Which Macs are supported?
macOS 14.0 or later. Apple Silicon and Intel are both supported natively via a universal binary.
Why not just use TextEdit or VS Code?
TextEdit shows Markdown as raw symbols. VS Code is a full IDE — hundreds of megabytes to read one note. TronDown is under 5 MB, opens instantly, and does one thing well.
Can I set TronDown as the default app for .md files?
Yes. Right-click any .md file → Get Info → Open with → TronDown → Change All. From then on, double-clicking any Markdown file opens it rendered.
Which Markdown syntax is supported?
Full CommonMark: headings, lists, tables, code blocks, quotes, links, images, and more all render correctly.
Does TronDown collect my data?
No. TronDown is fully offline — no internet connection, no account, no analytics, no tracking, no third-party SDKs. Your documents are read and written only on your device.
Which languages are supported?
The interface is available in English, Japanese, and Traditional Chinese. For rendering, mixed-language documents with CJK, Arabic, Hebrew, Thai, and more all display correctly.
Where can I buy it?
On the Mac App Store, available worldwide. Questions or feedback: pct@1tron.ai.
Get started now
Open your next Markdown file with TronDown
US$3.99 one-time purchase — no subscription, no in-app purchases. Download it, double-click any .md, and TronDown handles the rest.
© 2026 1Tron System Co., Ltd. · Crafted in Taiwan by 1tron
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