massCode is a free, open-source, local-first developer workspace for code snippets, Markdown notes, HTTP requests, calculations, drawings, and developer utilities. All data is stored as plain Markdown files on the user's own disk, making it portable, Git-friendly, and compatible with cloud sync tools like iCloud, Dropbox, and Syncthing. It includes a built-in AI assistant that connects to OpenAI, Anthropic, Gemini, DeepSeek, Mistral, or xAI via a user-supplied API key, enabling code editing, note organization, and HTTP workflow assistance. The app runs on macOS, Windows, and Linux with a command palette for keyboard-driven navigation across all workspace spaces.