Folio

Open a folder and Folio lists every Markdown file in it, lets you search titles, headings and full text, and renders documents with syntax highlighting, math, Mermaid diagrams and Obsidian-style links. It reads each document's status and tags from its front matter or Status: line, so you see at a glance which decisions are accepted, proposed or superseded, and can filter by them. Highlight passages, write notes on them, give your verdict on a whole document and bookmark sections as you read, then find every mark again in one list. It never edits your files: marks are kept in Folio's own folder.

Folio is made for the documents you have to read closely, such as the specs, architecture decision records and design proposals that pile up in every project, more and more of them written by coding agents. Open a project's docs folder, focus on the part you're reviewing, and mark what needs another pass.

Think of a newspaper: coding agents are the reporters, filing specs, plans and decisions faster than anyone can read them, and you're the editor, who reads each draft, marks it up, sends it back for another pass and decides what runs. Folio is the editor's desk, the other end of the agent's loop:

 agent writes / revises ──► Folio: read, mark up, decide
          ▲                              │
          └─────── review notes ◄────────┘

The agent edits the files; Folio only reads them, and your notes go back to the agent with Copy review notes.

Try it in your browser: the live demo opens a sample repository of specs and ADRs, with nothing to install. Your highlights and notes stay in your browser.

Download

Get the latest version from the download page or from GitHub Releases:

Platform	File
macOS (Apple Silicon)	Folio-<version>-arm64.dmg — signed and notarized
macOS (Intel)	Folio-<version>.dmg — signed and notarized
Windows	Folio-Setup-<version>.exe — not code-signed yet, so SmartScreen shows a warning: choose More info → Run anyway
Linux	Folio-<version>.AppImage — chmod +x it, then run it

The app checks for updates at launch (Folio → Check for Updates…).

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