GitHub Copilot

GitHub Copilot -- the AI pair programmer that started the AI coding revolution -- offers 30-day free trials plus free access for verified students, educators, and open-source maintainers with popular repositories.

What makes Copilot different: Unlike standalone chat interfaces, Copilot is embedded directly in your IDE. The autocompletion and Copilot Chat understand your entire codebase -- not just the file you have open. This ambient intelligence is qualitatively different from switching to a chat window.

Trained on the most code: GitHub Copilot is trained on more public code than any other model, and its suggestions are calibrated for real-world coding patterns. For boilerplate, test generation, and documentation, this shows clearly in output quality.

Free for open source: If you maintain a project with 100+ GitHub stars, GitHub typically offers free Copilot access. For students, the GitHub Student Developer Pack bundles Copilot with dozens of other tools.