E2B
e2b.dev
A cloud sandbox service for running AI-generated code safely, with $100 free credit, 150ms cold starts, and support for 20 concurrent sandboxes — designed for AI coding agents and assistants.
Why it is useful
Solves the core safety problem with AI code execution: you cannot safely run model-generated code in your own environment. E2B provides isolated sandboxes that spin up in milliseconds, can be torn down after each execution, and support file system access and package installation. Used by most serious AI coding agent projects as the execution layer.