Kastor vs Rowboat (2026)
A side-by-side comparison of Kastor and Rowboat on pricing, features, and fit, so you can decide which is right for you.
Quick answer
Kastor and Rowboat are both strong choices, but they fit different needs. Choose Kastor if you mainly need building multi-step research assistants that delegate subtasks to specialized sub-agents — its edge is completely free and open-source with no licensing fees or usage limits. Choose Rowboat if you need building customer support automation with multiple specialized agents — its edge is completely free and open-source with no usage-based fees. Kastor starts at Free; Rowboat starts at Free.
Features compared
- Multi-agent orchestration framework for coordinating multiple AI agents simultaneously
- Open-source codebase with full transparency and community-driven development
- Extensible architecture supporting custom LLM backends and tool integrations
- Agent communication and context-sharing protocols for collaborative task execution
- Multi-agent orchestration with configurable handoff logic
- Open-source and fully self-hostable with no vendor lock-in
- Composable agent design for building scalable AI pipelines
- Tool and function integration support for extending agent capabilities
Pros & cons
- Completely free and open-source with no licensing fees or usage limits
- Gives developers full control over agent logic, memory, and integrations
- Active open-source community enables rapid iteration and community-contributed extensions
- Requires developer expertise to set up and configure compared to managed platforms
- Documentation and support may be limited compared to commercial multi-agent frameworks
- Completely free and open-source with no usage-based fees
- Full control over data, infrastructure, and agent logic
- Active GitHub community and transparent development roadmap
- Requires technical expertise to set up and self-host
- No managed cloud version, so teams must handle their own infrastructure
The verdict
Choose Kastor if
you mainly need to building multi-step research assistants that delegate subtasks to specialized sub-agents. Its edge: completely free and open-source with no licensing fees or usage limits.
Choose Rowboat if
you mainly need to building customer support automation with multiple specialized agents. Its edge: completely free and open-source with no usage-based fees.
Frequently asked questions
Is Kastor better than Rowboat?
Neither is universally better. Kastor is stronger for building multi-step research assistants that delegate subtasks to specialized sub-agents, with an edge in completely free and open-source with no licensing fees or usage limits. Rowboat is stronger for building customer support automation with multiple specialized agents, with an edge in completely free and open-source with no usage-based fees. Pick based on your main task.
Which is cheaper, Kastor or Rowboat?
Kastor starts at Free and Rowboat starts at Free. Free tier: Kastor — Fully free and open-source; Rowboat — Fully free and open-source, self-hosted.
What is Kastor best for?
Kastor is best for building multi-step research assistants that delegate subtasks to specialized sub-agents, automating complex workflows where multiple ai agents must collaborate and hand off results, prototyping agentic pipelines for startups or research teams without incurring api or platform costs.
What is Rowboat best for?
Rowboat is best for building customer support automation with multiple specialized agents, creating research or data-gathering pipelines that route tasks between agents, developing internal developer tools that chain ai models for code review or generation.
Do Kastor and Rowboat have free plans?
Kastor: Fully free and open-source. Rowboat: Fully free and open-source, self-hosted. Check each tool's pricing page for current limits, as plans change.