🧱
Block editor
Build pages from headings, callouts, quotes, to-dos, code, tables, columns and images. Drag to reorder. Each block type has a keyboard shortcut.
Free and offline
Write markdown in blocks.
Blockdown builds documents out of blocks: headings, callouts, to-dos, code, tables and more. When you're done, export to Markdown, HTML, PDF or Word. The desktop app is free and works offline. The online version adds AI writing and grammar help if you want it.
No account required. No tracking. Your files stay on your machine.
Project notes
💡 Ship the desktop app this week.
A normal paragraph with bold and a bit of highlight.
Draw the logo
Put the site online
export const ready = true;
Features
The same editor works on your desktop and in the browser.
✨
AI writer Pro
Ask Claude to draft, rewrite, expand, summarize or change the tone of your text. It happens in the document, not a side chat.
✓
Grammar Pro
Get grammar and style fixes you can accept one at a time. Your formatting doesn't get touched.
⤓
Export
Send your document to Markdown, HTML, PDF or Word with one click. Colors and callouts survive the export.
🛡️
Works offline
The desktop app runs with no internet connection and no account. It does not upload your documents anywhere.
☁️
Cloud sync
Sign in on the web and your documents save to the cloud, so you can open them on another computer.
Markdown vs Blockdown
Blockdown keeps what is good about Markdown and drops the parts people get stuck on.
| Plain Markdown | Blockdown | |
|---|---|---|
| Editing | You type symbols like # and * by hand. | Click a block, press a shortcut, or just type the markdown. |
| Structure | It is one long text file. | Each part is a block you can move. |
| Color and callouts | Plain text only. | Headings, callouts and highlights have color. |
| Tables | Pipe and dash syntax that breaks easily. | A table you edit in place. |
| Images | A link to a file you manage yourself. | Paste an image straight in. |
| Export | Markdown, plus whatever your tool adds. | Markdown, HTML, PDF and Word in one click. |
| Learning curve | You memorize the syntax. | There is nothing to memorize. |
| The file itself | Markdown. | Still clean Markdown underneath. |
What people write with it
Anything that is better with structure than with a blank page.
📝
Meeting notes
Headings per topic, checklists for action items, callouts for decisions.
📦
READMEs and docs
Code blocks, tables and clean Markdown that drops straight into a repo.
✍️
Blog posts
Draft in blocks, export to Markdown or HTML for your site.
🎓
Study notes
Color-code topics, highlight key lines, keep code samples tidy.
📋
Project plans
Briefs with callouts, owners in checklists, columns for side-by-side notes.
📄
Reports for Word
Write once and export a clean .docx with colors and callouts intact.
Who it is for
👩💻
Developers
Write READMEs and docs in real Markdown without fighting the syntax.
🖊️
Writers and bloggers
Draft posts in blocks and export clean Markdown or HTML.
🎓
Students
Take notes that are easy to scan, then export to PDF to study or share.
📊
Product and PMs
Briefs, specs and plans with callouts and checklists built in.
🔬
Researchers
Keep notes with code, tables and citations, and export to Word.
🧩
Anyone who likes Markdown
Get the clean output without typing the symbols by hand.
Every block, at a glance
All the components you can drop in, each with its shortcut.
HeadingsCtrl 1/2/3
Heading 1
Heading 2
Heading 3
TextCtrl T
A plain paragraph with bold and a bit of highlight.
CalloutCtrl O
💡 A callout for the important bits.
QuoteCtrl Q
A quote that stands apart from the text.
Bullet listCtrl L
- First point
- Second point
- Third point
Numbered listCtrl N
- Step one
- Step two
- Step three
ChecklistCtrl K
Finished task
Open task
TableCtrl G
| Name | Role |
|---|---|
| Ada | Author |
ImageCtrl J
🖼️
ColumnsCtrl M
Left
Right
CodeCtrl E
const ready = true;
DividerCtrl D
Four export formats
.md
.html
.pdf
.docx
Write once and export to any of these. The layout holds up in each one.
Pricing
Free to start. You only pay if you want the AI features.
Desktop
Free
The full editor, offline.
- ✓ All block types and exports
- ✓ No account needed
- ✗ No AI or grammar
Most chosen
Pro
Coming soon
Everything in Free, plus AI.
- ✓ AI writer and grammar
- ✓ Unlimited cloud documents
- ✓ Open on any device
Online
Free
A free account with cloud storage.
- ✓ Up to 3 cloud documents
- ✓ Open on any device
- ✗ No AI or grammar
Your OS may warn that the app isn't signed yet. On Windows choose More info then Run anyway; on macOS right-click the app and choose Open. A Linux build is coming.