GitHub Copilot offers code suggestions, snippets, comments, and documentation based on open-source patterns but requires a subscription. Codeium, a free alternative, provides similar code completion features, supports over 70 languages, and integrates with a wide range of IDEs including VSCode, JetBrains, and Eclipse. Unlike Copilot, Codeium offers additional capabilities like In-IDE integrated search and is SOC 2 Type 2 compliant for security.