Write and preview
A native editor with live rendering, outline, search, image assets, KaTeX, Mermaid, and code highlighting.
macOS · iPhone · iPad
GrayCat Markdown
A focused writing workspace built around your own Markdown files—from editing and preview to export and publishing checks.
Core capabilities
Export and publish
Export HTML, PDF, and long images, plus DOCX on Mac, with tailored checks and copy paths for publishing platforms.
Mac and mobile
Use local files or your own iCloud documents and continue writing on Mac, iPhone, and iPad.
Optional AI
Choose on-device models or a BYOK cloud provider. The app shows selection or full-text scope before any document content is sent.
Your writing remains ordinary files
GrayCat Markdown does not require a GrayCat account. Documents stay in a local folder you choose or in Apple iCloud; the developer cannot access your iCloud documents.
Cloud AI is optional. Requests go directly from your device to the third-party provider you configure; GrayCat does not operate an AI relay. Read the privacy policy for the complete scope.