Capsule

Capsule is a sandboxed runtime for executing untrusted code in isolated WebAssembly environments, built for Python and TypeScript/JavaScript. It enables developers to safely run user-submitted or third-party code with fine-grained control over CPU, memory, execution time, and access permissions, supporting both CLI and SDK workflows. Ideal for applications needing secure code execution, resource limiting, and automatic failure recovery, such as code evaluation platforms, multi-tenant SaaS, and secure scripting.