MarkSay
A Mac Markdown editor with Mermaid, mathematics, and Word export — that you can also hand to an AI assistant.
Download on the Mac App StoreA proper Markdown editor first
Write, preview, export
Source, split, and preview modes. GitHub-flavoured Markdown with tables, task lists, and fenced code. Mermaid diagrams and mathematics render in the preview. Export to HTML, PDF, or Word — with diagrams and equations carried across as vector graphics.
The everyday things, done properly
Find and replace in the editor and in the preview. A document outline. Live word and character counts that count what a reader sees — not your Markdown syntax. Front matter preserved, highlighted, and kept out of the rendered page.
Then hand it to an assistant
It reads what you have open
Turn on Agent Access and your assistant can list your open documents and read them — content, revision, and your current selection. That much is free, forever.
MarkSay Agent lets it write
Create documents, replace or append text, edit an exact range, open files in folders you have authorized, and save. Every edit is revision-checked, so a stale write is refused instead of quietly overwriting your work — and each one is a single Undo.
You can see what it is talking about
Ask it to show you something and MarkSay scrolls there and selects it in both panes, marking the block it landed on. You are reading the passage while your assistant discusses it, rather than hunting for it afterwards.
Private by design
No account, no sign-in, no analytics, and no telemetry. Agent Access is off until you turn it on, listens only on 127.0.0.1, and requires a token you can rotate at any time — nothing outside your Mac can reach it.
The preview runs with JavaScript disabled for page content and a strict content policy. Remote images are off by default, because loading one tells that server you opened the document. Exporting makes no network request at all — an exported file never carries a remote address.
Details on the privacy page.
Pricing
MarkSay is free — the editor, the preview, every export you drive yourself, and read-only assistant access.
MarkSay Agent is a one-time unlock that lets an assistant write — and export your document to HTML, PDF, or Word, rendered locally with no tokens spent. There is a 14-day trial, started from the menu when you want it. No subscription.
Support
Questions, bugs, or feedback? Email support@ebtechnologies.net. Details on the support page.