The app, and the family around it.
One open format, one free desktop app to live in — and a family of
services that grow out of the same plain .md file.
Every other format makes you pick one.
Files are portable but frozen. Apps respond but need a server and a login. Rho MD is the only thing that's both.
PDF, slides, video, plain Markdown. Easy to send and keep — but the bits never change when you look at them.
SaaS dashboards, notebooks, online widgets. They respond — but they live behind an install, an account, a URL that rots.
Rho MD lives here. A single declarative .md that computes for the reader — and still emails, greps, and stores for ten years.
Where Rho shines.
Interactivity wins decisively whenever the content has variables, cause-and-effect, or steps. These are the documents Rho was built for.
Don't explain the formula — let them feel it.
Drag-to-learn explorables for math, finance literacy, physics, statistics. The reader builds intuition by manipulating, not watching.
What-if, not just what-is.
Readers plug in their own assumptions and the report recomputes for them — projections, models, pricing, scenarios. One file, every scenario.
Docs that demonstrate.
Live config builders, tunable API examples, step-through guides, and version timelines — the doc shows the behavior instead of describing it.
A dashboard you can email.
Metrics and charts that compute locally — no BI login, no broken link next quarter. Send the numbers and the controls in one .md.
More than a reader.
The free desktop app is where your library lives — edit in place,
organize visually, lock what's private. All of it stays plain
.md on your disk.
.md file.
Edit in place
WYSIWYG-lite editing for your text, with a slider down to raw Markdown when you want the source. Common syntax converts as you type.
A star map of your library
Psi, the built-in document manager, lays your docs out as a galaxy — related documents cluster together. Double-click a star to open it.
A freeform canvas
Think on an infinite board — drag notes, link ideas, drop in documents. It saves as a plain .md file, like everything else.
Lock what's private
Password-protect any document: encrypt it so reading needs the password, or keep it readable and require the password only to edit.
Plugins, done right
A clean plugin API — with official calendar and pomodoro plugins — built on the same registry the app's own features use.
AI-native to the core
Every command — open, edit, organize, lock, publish — is exposed through a local agent API. Your AI assistant can drive the whole app.
One format. A family of ways to use it.
Reading and sharing are free — that's how Rho spreads. Creating at scale, syncing, and AI generation are where Rho earns its keep.
The core app & renderer. Read and write interactive .md on desktop. Like a PDF reader, but the document is alive.
This site and the in-browser renderer — open and view any Rho document with nothing installed.
rho.md →A WYSIWYG editor where the source is the widget. Author interactive docs without touching syntax.
Coming soonShare by link for free — anyone with the link can view. Publish to the public index, with search and your author page, for $5/mo.
rho.md/cloud →Describe what you want in plain language; get back a working interactive .md. The thing nothing else offers.