Conductor and Fleet both run multiple AI coding agents in parallel, each in an isolated git worktree. The core difference is the operating model: Conductor is a Mac GUI where you watch agents work, then review and merge their changes — everything runs on your machine using your existing Claude Code or Codex login, and the app itself is free. Fleet is a headless Go binary with a watcher daemon, a Fabric event bus, role-based governance, and GitHub workflow automation, designed to run agents autonomously without a person at the keyboard.
The choice between them often comes down to whether your team wants a hands-on desktop app for parallel sessions (Conductor) or an autonomous, event-driven, governed agent system (Fleet).