sandbox-sdk vs CubeSandbox
Cloud sandbox projects compared
sandbox-sdk runs Linux sandboxes through Cloudflare Workers, Durable Objects, and Containers. CubeSandbox is a self-hostable service that runs workloads in KVM-based microVMs; the main choice is between Cloudflare’s platform and operating Linux infrastructure yourself.
sandbox-sdk: Run Sandboxed Code on Cloudflare's Edge
Cloudflare Sandbox SDK runs untrusted or generated code in Linux sandboxes built on Cloudflare Durable Objects and Containers. It gives Workers control over sandbox ownership, network access, and credentials, with tools for files, bucket mounts, and backups.
CubeSandbox: Run Secure, Fast Sandboxes for AI Agents
CubeSandbox is a self-hostable sandbox service for running untrusted AI-agent workloads in hardware-isolated microVMs. It combines E2B SDK compatibility with snapshots, network controls, and single-node or multi-node deployment.
| sandbox-sdk | CubeSandbox | |
|---|---|---|
| Language | TypeScript | Go |
| License | — | NOASSERTION |
| Stars | 1.2k | 12.8k |
| Forks | 121 | 1.2k |
| Last analyzed | Oct 30, 2026 | Oct 3, 2026 |
Key differences
- sandbox-sdk is written in TypeScript and is built around Cloudflare Workers, Durable Objects, and Containers; CubeSandbox is written in Go and uses KVM-based microVMs.
- sandbox-sdk lets a Worker assign sandbox ownership and control reachable hosts, with storage credentials kept outside the sandbox for S3-compatible mounts. CubeSandbox provides network and egress controls, with optional credential injection through a security proxy.
- sandbox-sdk adds file transfer, bucket mounts, and directory backup and restore. CubeSandbox offers snapshots, cloning, rollback, and automatic pause and resume.
- sandbox-sdk targets teams building on Cloudflare’s edge platform. CubeSandbox targets teams that can operate Linux and KVM infrastructure, with single-node and multi-node deployment options.
- sandbox-sdk’s stated license is Apache License 2.0. CubeSandbox’s metadata says NOASSERTION, while its README states Apache License 2.0, so verify its license files and terms.
Choose sandbox-sdk if you…
- need to run sandboxes as part of a Cloudflare Workers application.
- want Worker-controlled sandbox ownership and network access, or S3-compatible mounts and directory backups.
- are building coding-agent or code-execution workflows on Cloudflare’s platform.
Choose CubeSandbox if you…
- need hardware-isolated microVMs with a dedicated OS kernel.
- want a self-hosted service with E2B SDK-compatible interfaces and Linux/KVM deployment.
- need snapshots, cloning, rollback, or multi-node deployment for sandbox workloads.
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This comparison is generated with AI from the OSRepos analyses of both projects. Always check each project's repository and documentation before choosing.