What is massCode used for?

massCode is a free, local-first developer workspace that combines code snippets, Markdown notes, an HTTP client, a math notebook, drawings and dev tools in one desktop app. It is a good fit for keeping reusable code snippets, testing APIs alongside developer notes and local-first knowledge base for engineers.

Is massCode open source?

Yes. massCode is open source under the AGPL-3.0 licence. Its source code is on GitHub at massCodeIO/massCode and is written mainly in TypeScript.

Yes. massCode is open source, so the software itself is free to use.

What is massCode an alternative to?

massCode is an open-source alternative to Dash.

Is massCode actively maintained?

Yes. The most recent commit to massCode was on 1 October 2026, and the latest release is v6.0.0, published on 27 September 2026. The project has 7k stars on GitHub.

massCode: open-source alternative to Dash

About massCode

massCode is a free and open-source developer workspace that started life as a snippet manager and now brings several tools together. It combines code snippets, Markdown notes, HTTP requests, calculations, drawings and developer tools in one local-first app, with the workspace stored on your own disk as plain Markdown files.

Snippets are organized in folders and tags, notes can be linked and shown in a graph, and tasks with status, priority and due dates can link to notes, snippets and API requests. The HTTP client supports API workflows: saved requests run one after another, values carry over between steps and test results are displayed. A command palette finds items and runs commands from the keyboard, and a built-in AI assistant helps with code, notes and HTTP workflows.

massCode is available for macOS, Windows and Linux, can be installed via Homebrew, and has extensions for VS Code and Raycast. It is built with Electron and Vue, licensed under AGPL-3.0, and works offline. It suits developers who want a single local app instead of separate snippet, notes and API tools.

Key features

Code snippet manager with folders and tags
Markdown notes with link graph
HTTP client with request workflows
Math notebook and drawings
Built-in AI assistant
Keyboard-driven command palette
Extensions for VS Code and Raycast

Good fit for

→Keeping reusable code snippets
→Testing APIs alongside developer notes
→Local-first knowledge base for engineers

Built with: TypeScript; Electron; Vue
Tags: snippets; developer-tools; notes; http-client; markdown; local-first; electron; productivity; api-client

massCode: questions and answers

What is massCode used for?: massCode is a free, local-first developer workspace that combines code snippets, Markdown notes, an HTTP client, a math notebook, drawings and dev tools in one desktop app. It is a good fit for keeping reusable code snippets, testing APIs alongside developer notes and local-first knowledge base for engineers.
Is massCode open source?: Yes. massCode is open source under the AGPL-3.0 licence. Its source code is on GitHub at massCodeIO/massCode and is written mainly in TypeScript.
Is massCode free?: Yes. massCode is open source, so the software itself is free to use.
What is massCode an alternative to?: massCode is an open-source alternative to Dash.
Is massCode actively maintained?: Yes. The most recent commit to massCode was on 1 October 2026, and the latest release is v6.0.0, published on 27 September 2026. The project has 7k stars on GitHub.