BCD

Mac apps › M

Use MarkViewer on your Mac from ChatGPT or Claude

Minimal markdown editor. With BCD, ChatGPT, Claude and other AI apps can open MarkViewer on your Mac, read its window and press buttons or type, from your phone or another computer.

Works on

About MarkViewer

Version
1.8.18
Installs (last 365 days)
359 · #1,411 among Homebrew apps
Updates
Updates itself
Homepage
markviewer.com
Install
brew install --cask markviewer

Try asking

“Open MarkViewer and tell me what is on its screen”
“Install MarkViewer with Homebrew”
“Quit MarkViewer and update it to the latest version”

Questions

Can ChatGPT control MarkViewer?
On a Mac with BCD, yes, through the app's window: ChatGPT can open MarkViewer, read the buttons and text it shows, press buttons, type and pick menu items. How far that goes depends on how much of its window MarkViewer exposes to macOS accessibility.

Does this work on Windows?
No. BCD controls app windows only on a Mac. On Windows and Linux it works with files and commands.

Is it safe?
A new computer starts read-only. Controlling the screen and apps is turned on per computer, and macOS asks once before BCD may control apps.

Try it on your computer

BCD connects ChatGPT, Claude and other AI apps to your own Mac, Windows or Linux computer. One computer is free, with 20,000 tool calls a month and no card.

Program data from Homebrew, updated 2026-11-11. Installs are Homebrew's installs on request over the last 365 days.