BearDrive vs Kastor (2026)
A side-by-side comparison of BearDrive and Kastor on pricing, features, and fit, so you can decide which is right for you.
Quick answer
BearDrive and Kastor are both strong choices, but they fit different needs. Choose BearDrive if you mainly need collecting and reviewing artifacts produced by multiple coding agents across a team — its edge is full agpl-3.0 server source code released with no stripped-down core. Choose Kastor if you 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. BearDrive starts at Pricing on request; Kastor starts at Free.
Features compared
- Shared folder with real file paths readable and writable by any AI agent
- Version history and per-agent-session attribution for every file written
- Shareable links generated seconds after a file is written
- Supports S3, GCS, R2, MinIO, and plain disk as storage backends
- 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
Pros & cons
- Full AGPL-3.0 server source code released with no stripped-down core
- No integration required since any tool that writes files works out of the box
- Verified two-way portability between self-hosted and managed tiers via export and import
- Managed service is in beta with no announced pricing or end date for the beta period
- AGPL-3.0 license can be a blocker for some legal reviews, pushing those teams toward the unpriced managed tier
- 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
The verdict
Choose BearDrive if
you mainly need to collecting and reviewing artifacts produced by multiple coding agents across a team. Its edge: full agpl-3.0 server source code released with no stripped-down core.
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.
Frequently asked questions
Is BearDrive better than Kastor?
Neither is universally better. BearDrive is stronger for collecting and reviewing artifacts produced by multiple coding agents across a team, with an edge in full agpl-3.0 server source code released with no stripped-down core. 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. Pick based on your main task.
Which is cheaper, BearDrive or Kastor?
BearDrive starts at Pricing on request and Kastor starts at Free. Free tier: BearDrive — Self-hosted free forever under AGPL-3.0; managed service free during beta; Kastor — Fully free and open-source.
What is BearDrive best for?
BearDrive is best for collecting and reviewing artifacts produced by multiple coding agents across a team, sharing agent-generated files with teammates instantly via a link, self-hosting a fully open-source ai agent file system on your own infrastructure.
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.
Do BearDrive and Kastor have free plans?
BearDrive: Self-hosted free forever under AGPL-3.0; managed service free during beta. Kastor: Fully free and open-source. Check each tool's pricing page for current limits, as plans change.