OpenSandbox and runtm
These are **competitors** offering overlapping functionality—both provide isolated sandbox environments for executing agent-generated code, though OpenSandbox is a more mature, feature-rich platform with broader language/runtime support while runtm is a lighter-weight alternative specifically optimized for AI coding agents.
About OpenSandbox
alibaba/OpenSandbox
OpenSandbox is a general-purpose sandbox platform for AI applications, offering multi-language SDKs, unified sandbox APIs, and Docker/Kubernetes runtimes for scenarios like Coding Agents, GUI Agents, Agent Evaluation, AI Code Execution, and RL Training.
Supports strong workload isolation through secure container runtimes (gVisor, Kata Containers, Firecracker) and implements unified network policies with ingress gateway routing plus per-sandbox egress controls. The platform provides built-in Command, Filesystem, and Code Interpreter implementations with lifecycle management across Docker and high-performance Kubernetes runtimes, enabling seamless scaling from local development to distributed scheduling.
About runtm
runtm-ai/runtm
Open-source sandboxes where coding agents build and deploy. Spin up isolated environments where Claude Code, Cursor, and other agents code and deploy software.
Provides OS-level sandboxing using bubblewrap (Linux) and seatbelt (macOS) for sub-100ms startup without containers, enabling agents to code with full permissions safely. Includes a FastAPI control plane with a build/deploy worker pipeline that provisions live HTTPS endpoints on auto-stopping infrastructure. Supports multiple AI agent adapters (Claude Code, Cursor, Codex, Gemini CLI) through a modular architecture with persistent workspaces and full self-hosting capabilities.
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