Captain Stack is an open-source VS Code extension for code suggestion and generation, published from the copilot-clone repository on GitHub. It has 1,783 stars and was last updated in 2024. Where GitHub Copilot relies purely on AI, Captain Stack combines community knowledge search with AI generation in a single inline workflow.
The extension works from comments in your code. Type a trigger such as // find binary search in JavaScript. and Captain Stack searches Stack Overflow answers and GitHub Gists for matching code and offers it as autocomplete suggestions. With the AI providers enabled, the // generate trigger produces code from OpenAI or OpenRouter models using your own API key. Both sources can be enabled at once, so you can pick between a battle-tested community snippet and a freshly generated implementation without leaving the editor. The project began in the early Copilot era as an experiment in open code assistance and has kept evolving since; the marketplace listing under the Captain Stack name is its maintained distribution. Settings let you toggle each provider independently, so the suggestion list can mix community answers and AI output in whatever proportion you prefer.
Captain Stack is free and open source under the MIT license. The search features cost nothing; AI generation uses your own OpenAI or OpenRouter API key, billed by those providers.
Captain Stack is for VS Code users who want Copilot-style assistance with more control over where suggestions come from, especially developers who trust curated community answers for common problems.