Cairn
Cairn is a general-purpose search engine that runs AI worker agents to find a path from a starting point to a goal, validated first on penetration testing.
What it is good for
- Automating penetration testing of authorized systems
- Searching for a path through a complex problem with AI agents
- Solving capture the flag security challenges
- Coordinating several AI agents through a shared board
At a glance
- Who it is for
- Setup
- Guided command-line setup
Level 4 of 5. You copy and paste commands into a terminal by following the instructions. Comfortable territory for vibe coders.
- Cost
- Free and open source
- Type
- Framework or SDK
- Tasks
- Works with
- Claude Code, Codex, Pi, Docker
Momentum
- Rank this week
- #35 in builder tools
- Best rank
- #35 week 44, 2026
- Stars gained last week
- +251
- GitHub stars
- 4,749
GitHub numbers as of Nov 2, 2026. Updated weekly.
Ranking history
Official links
Setup steps are on the official pages. We do not repeat them here, since they change.
Questions
- Is Cairn free?
- Yes. It is free and open source (AGPL-3.0 license).
- Do I need to know how to code to use Cairn?
- You do not need to write code, but setup means copying and pasting commands into a terminal by following its instructions.
- What does Cairn work with?
- According to its own documentation, it works with Claude Code, Codex, Pi, and Docker.
- What is Cairn good for?
- Automating penetration testing of authorized systems, searching for a path through a complex problem with AI agents, solving capture the flag security challenges, and coordinating several AI agents through a shared board.
Similar agents
- Raven
Raven is a multi-agent orchestration system that coordinates specialized AI agents for complex tasks such as research, coding, and visual design for developers and teams.
- RSI-Anything
RSI-Anything is a research framework that lets AI agents predict outcomes, test actions, and improve over repeated rounds for developers and researchers.
- RSIHub
RSIHub is a framework that lets developers run controlled, auditable self-improvement experiments on AI agents.
- Understand-Anything
Understand-Anything is a plugin that turns a codebase, knowledge base, or docs into an interactive graph you can explore and ask questions about, for people new to a project.
- DeerFlow
DeerFlow is an open-source super agent that researches topics, writes code, and creates content over tasks that take minutes to hours, for people who need multi-step work done.
- OmO
OmO is a coding agent app that turns a single prompt into finished software work for developers and builders who want agents to handle multi-step jobs.