Open Source Factory Alternatives
A curated collection of the 2 best open source alternatives to Factory.
The best open source alternative to Factory is OpenCode. If that doesn't suit you, we've compiled a ranked list of other open source Factory alternatives to help you find a suitable replacement. Other interesting open source alternative to Factory is SWE-agent.
Factory alternatives are mainly AI Assisted Coding. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Factory.
An open source AI coding agent for the terminal, with a beta desktop build and installs through every major package manager.
OpenCode is an open source AI coding agent that works from the terminal, with a desktop build for people who would rather have a window. It closes the gap between an assistant locked inside one editor and the shell where the rest of the work happens.
Installation is deliberately unopinionated. A single script covers macOS and Linux, and the same release lands in npm, Homebrew, Scoop, Chocolatey, pacman, mise and Nix. The script resolves where to place the binary through an ordered list of environment variables and directories, so it fits a managed setup instead of fighting it.
The parts you interact with day to day are few.
- Build agent: the default, with full access for development work.
- Plan agent: read-only, denying file edits and asking before it runs shell commands, meant for exploring an unfamiliar codebase.
- Tab switching: the two agents swap with one key, no restart and no reconfiguration.
- General subagent: an at-mention hands off complex searches and multistep tasks.
- Desktop app: DMG, exe, deb, rpm and AppImage builds, still marked beta.
Configuration lives in the project documentation, and the readme is maintained in more than twenty languages. The team asks anyone shipping a related project with opencode in its name to state plainly that it is unaffiliated, which is a fair signal of how much third-party tooling has grown around it.
Research agent that lets a language model fix GitHub issues and solve security challenges autonomously, configured from a single YAML file.
SWE-agent hands a language model a set of tools and lets it work. Point it at a real GitHub repository and it attempts the issue on its own, and the same machinery has been aimed at offensive cybersecurity challenges and at arbitrary custom tasks.
The project comes from researchers at Princeton University and Stanford University, and the design reflects that. Behavior is governed by one YAML file rather than scattered code, the agent is left maximal agency instead of being railroaded down a fixed script, and the codebase stays simple and hackable so an experiment is cheap to run.
Several points matter before you pick it up.
- Superseded by a smaller sibling: most development effort has moved to mini-swe-agent, which matches the performance while being much simpler, and the maintainers recommend it going forward.
- Model agnostic: bring the model you prefer, with GPT-4o and Claude Sonnet 4 named as examples.
- Benchmark record: it holds state of the art results on SWE-bench among open source projects.
- EnIGMA mode: an offensive security mode solves capture the flag challenges, currently requiring version 0.7 while it is brought up to date.
- Try it first: a Codespaces launch runs the agent in your browser with no local installation.
Documentation covers installation from source, a command line hello world and batch mode for benchmarking against SWE-bench. Given the maintainers' own advice, treat this repository as the research reference and the fuller feature set, and reach for the smaller agent when you simply want results.
