Devin's cloud-hosted model and ACU pricing push many teams toward open-source alternatives that provide similar autonomous coding capability on their own infrastructure. The open-source ecosystem has matured significantly, with several projects now competitive on the SWE-bench benchmark.
This list covers the best open-source options for teams that want Devin-style autonomy without the closed-source cloud dependency.
The most architecturally complete open-source alternative. MIT licensed, Docker-based, supports Claude, GPT-4, and many other LLMs, and provides a browser UI for monitoring agent execution in a sandboxed Linux environment. Consistently strong SWE-bench results.
Best for: Teams that want the closest open-source equivalent to Devin and are comfortable managing a Docker environment.
Research agent built by Princeton and Stanford with a clean agent-computer interface. Among the earliest competitive SWE-bench performers and still a solid baseline. MIT licensed.
Best for: Researchers and engineers who want a well-documented, benchmark-validated agent they can study or extend.
Lightweight, model-agnostic terminal agent. Apache 2.0 licensed, installs with pip, no container required. Active community and weekly releases.
Best for: Developers who want a stable, low-overhead open-source agent for interactive coding sessions.
Open-source VS Code extension with an agentic action loop. Apache 2.0 licensed, bring-your-own-model, explicit approval steps for each action.
Best for: Developers who want an editor-integrated open-source agent with granular control.
OpenAI's open-source terminal agent. Apache 2.0, sandboxed execution, multimodal input. Transparent design and composable architecture.
Best for: Teams on the OpenAI stack who want an open-source terminal agent with a safety-first execution model.
Fleet itself is a self-hosted Go binary (though not open-source — it has a free tier for one agent slot). It sits above open-source agents like OpenHands or Aider and provides the multi-agent coordination layer: role assignments, fabric event bus, per-agent budgets, and audit trails. If you are running OpenHands or Aider at scale and need governance across multiple agents and repos, Fleet is the orchestration layer worth adding. The free tier covers small teams and evaluation.
Pick OpenHands for the most complete open-source Devin alternative with browser UI and Docker sandbox.
Pick SWE-agent for a benchmark-validated research-grade agent.
Pick Aider for a stable, lightweight terminal agent with no container overhead.
Pick Cline for an editor-integrated open-source option.
Add Fleet when you need to coordinate multiple open-source agents with governance and budgets.
OpenHands consistently scores near the top of the open-source leaderboard, especially with strong underlying models like Claude or GPT-4. SWE-agent is the benchmark-setting research baseline. Results shift as models improve — check the live SWE-bench leaderboard for current standings.
OpenHands requires an LLM API, which typically means an internet connection to a model provider. If you run a local model via Ollama, you can configure OpenHands to use it and operate fully air-gapped, though performance will depend on the local model's capability.
One binary. Five minutes. See every agent, coordinate every handoff, and keep a full audit trail of what your fleet did.
