Wren app icon

Read what your agents write.

A light Markdown reader for Mac that updates the moment your agent saves.

Download for Mac

FreemacOS 26Apple silicon12 MB

Wren is a Mac app. Send the link to your Mac.

Wren showing PLAN.md, a plan file written by an AI agent, in its dark reading theme

Live reload

See every change as it lands.

When an agent rewrites the file, Wren updates the view instantly. New and edited blocks glow green, and a 3 changes ↓ pill jumps between them.

Reading at the end of the file? The view follows it as it grows.

An agent editing PLAN.md while Wren marks the new step in green

Diagrams

Every diagram, drawn.

Mermaid diagrams render right in the page. Click one to open it full-window: zoom, pan, copy it as an image or save it as SVG.

Math and code come out right too. Everything is bundled, so it works offline.

A Mermaid sequence diagram and a KaTeX formula rendered by Wren

Edit

Fix a typo without leaving.

Press ⌘E for a split editor with live preview. The two panes scroll together. Press it again to go back to reading.

Wren's split editor: Markdown source on the left, the rendered page on the right

Projects

Every file, one keystroke away.

Press ⌘P to find any .md file in the project, newest first. Even the ones inside .claude/.

Press ⌘B for a live tree of the folder's Markdown. A green dot marks files an agent changed since you last read them.

Open Quickly listing a project's Markdown files, newest first, including notes.md inside .claude

Everything in Wren.

A reader first, with just enough editor to fix a line. Every tile below works. Try them.

See what changed

When an agent saves, new and edited blocks glow green. The pill jumps between them.

PLAN.md

Steps

  • Read the current save path
  • Sketch the outbox schema
  • Write the migration

Live reload

The view updates the moment the file does. Unsaved edits? It asks first.

PLAN.mdEdited
An agent changed this file.

Steps

Read the current save path Sketch the outbox schema Retry with exponential back

Diagrams, drawn

Mermaid, math and code, all offline. Zoom in and drag around.

okconflict Edit Local DB Outbox Sync API Merge Ack
100%

cn+1 = max(clocal, cremote) + 1

Open Quickly

⌘P finds any .md in the project, even in .claude/. Type to try.

    Tick it in the file

    Click a checkbox and Wren writes the [x] back to disk.

    PLAN.mdSaved to disk- [ ] Write the migration

    Quick Look

    Press Space on a file in Finder for a fully rendered preview.

    Make it yours

    Wren, GitHub, Paper and High Contrast, each light and dark. Sans, serif or mono. Or your own CSS.

    Review: PR 212

    ImportantTwo blocking issues. Everything else is style.

    Blocking

    1. Race in Outbox.flush(). Two timers can send the same operation twice.
    2. Migration drops deleted_at. See Outbox.swift:88.

    Fix a line

    ⌘E opens the editor beside the page. Type on the left and watch the right.

    PLAN.md

    Folder sidebar

    ⌘B shows the folder's Markdown. Green dots mark what an agent changed.

    Find in Project

    ⇧⌘F searches every Markdown file at once.

    From the terminal

    wren opens files and folders. Pipe anything into wren -.

    Export

    A PDF, one self-contained HTML file, or rich text for Mail.

    PLAN.md3 diagrams, a table and math. Pick a format.

    And the small things

    Open a folder: ⌥⌘O or drag it in Your default .md app Footnotes and front matter [!NOTE] alerts Copy buttons on code Smart lists Pasted images saved to assets/ Outline ⇧⌘O Find ⌘F Text size ⌘+ Print ⌥⌘P

    Make it look your way.

    Wren, GitHub, Paper and High Contrast, each in light and dark. Sans, serif or mono. Or bring your own CSS, and it reloads as you save.

    Three documents in Wren's Dusk, Morning and Paper themes

    Questions

    Is it really free?

    Yes. No account, no tracking, and no paid tier. Download it and it's yours.

    Does it work offline?

    Yes. Mermaid, KaTeX and code highlighting are bundled inside the app. Nothing loads from the internet.

    Which Macs does it run on?

    Apple silicon Macs on macOS 26 Tahoe or later.

    Can it be my default app for .md files?

    Yes. Wren offers on first launch, and you can change it any time. Then double-click any .md file and it opens in Wren.

    I used Markview. What happens?

    Wren is Markview's new name. On first launch it copies your settings and custom CSS across.

    Read the guides: compare Mac Markdown viewers or read Claude Code plans with Wren.

    Open your first plan in Wren.

    Download for Mac

    FreemacOS 26No account