GitHub Copilot
GitHub's AI coding assistant (2021): inline completion, chat, agent mode, PR review across editors.
- Pioneered the inline-completion category.
- Now: Chat, CLI, Workspace, coding agent, PR review.
- Default for many enterprises because it bundles with GitHub.
When to use: When team already uses GitHub heavily and wants integrated AI in PRs and Actions.
Example: Copilot Pro $10/mo (free for students/OSS maintainers); Business $19/user/mo with unlimited completions.