E2B is open-source infrastructure for running AI-generated code safely. Each sandbox is a lightweight Firecracker microVM, so agents can execute code, install packages and work with files without touching your own servers. Developers control sandboxes from Python and JavaScript SDKs.
Key features
- Firecracker microVM isolation
- Python and JavaScript SDKs
- Fast sandbox startup for agent loops
- Filesystem, process and package access inside the sandbox
- E2B Secrets: agents call APIs without keys living in the sandbox (GA Oct 7, 2026)
Who it's for
E2B suits developers of AI agents, code interpreters, data analysis copilots and coding assistants that need to execute untrusted code.
Common use cases
- Code interpreter features in chat apps
- Data analysis agents
- Running and testing LLM-written code
- Agent evaluations at scale
Pricing
E2B is freemium. The free Hobby tier includes $100 in one-time credits; paid plans add more usage. Check the official site for current plan details.
Why E2B is trending
E2B Secrets became generally available on Oct 7, 2026, letting agents call external APIs without exposing keys inside the sandbox, and SDK 2.58 shipped on Oct 20, 2026.
Sources: e2b.dev
How to get started with E2B
- Visit the official E2B website at https://e2b.dev and read the quickstart in the docs.
- Sign up or install it, depending on whether you use the hosted service or the open-source version.
- Try it on a small project first, then connect it to your existing stack and CI.
- Review the pricing page before scaling usage so costs stay predictable.
Is E2B worth it?
E2B is a well-established tool with an active team and frequent releases in October 2026. For teams that match the use cases above, it's worth evaluating against the alternatives listed here, and the freemium model makes it easy to try before committing.
Alternatives
- Daytona: agent cloud with fork and snapshot
- Modal: serverless compute with sandboxes
FAQ
What is E2B?
E2B runs AI-generated code in secure Firecracker microVM sandboxes, with Python and JavaScript SDKs built for AI agents and coding tools.
Is E2B open source?
Yes, E2B's core is open source.
Is E2B free?
The Hobby tier is free with $100 in one-time credits.
What languages does E2B support?
It offers Python and JavaScript SDKs, and sandboxes can run any code a Linux VM can.