Devin
Cognition's autonomous AI engineer that plans, codes, tests, debugs, and opens PRs unattended. Now shipped alongside Windsurf (acquired July 2025) as the async half of Cognition's stack — Devin runs async tasks, Windsurf is the in-editor surface.
Jules
Google's async autonomous coding agent powered by Gemini 2.5 Pro. Integrates with GitHub — assign it a task, it runs in a sandboxed VM, and returns a diff or PR. GA since August 2025. Competes directly with Devin and GitHub Copilot Workspace.