CubeSandbox vs zeroboot
VM sandboxes for AI-agent code execution compared
CubeSandbox and zeroboot both run untrusted code in KVM-based virtual machines for stronger isolation than process-based sandboxes. CubeSandbox is a self-hostable sandbox service with E2B-compatible interfaces and broader operational features, while zeroboot focuses on quickly forking Firecracker snapshots and is described as a working prototype.
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.
zeroboot: Create Fast VM Sandboxes for AI Agents
Zeroboot uses copy-on-write forks of Firecracker VM snapshots to create isolated sandboxes quickly for code execution. It is aimed at teams running agent-generated code that need VM-level isolation and can accept a working-prototype maturity level.
| CubeSandbox | zeroboot | |
|---|---|---|
| Language | Go | Rust |
| License | NOASSERTION | Apache-2.0 |
| Stars | 12.8k | 2.5k |
| Forks | 1.2k | 110 |
| Last analyzed | Oct 3, 2026 | Oct 3, 2026 |
Key differences
- CubeSandbox is written in Go; zeroboot is written in Rust.
- CubeSandbox offers REST APIs compatible with the E2B SDK interface; zeroboot provides an HTTP API plus Python and TypeScript SDKs.
- CubeSandbox supports single-node and multi-node deployment, snapshots, cloning, rollback, and network controls; zeroboot centers on copy-on-write snapshot forks with no networking in forks.
- CubeSandbox supports self-hosting on Linux with KVM and describes Kubernetes deployment as preview; zeroboot offers self-hosting or a managed API, and self-hosting requires Linux with KVM.
- zeroboot is described as a working prototype, not production-hardened; CubeSandbox's considerations focus on infrastructure requirements and preview features.
- CubeSandbox's metadata reports NOASSERTION for its license while its README states Apache License 2.0; zeroboot lists Apache-2.0.
Choose CubeSandbox if you…
- need E2B SDK-compatible interfaces for a self-hosted service.
- want multi-node deployment, network controls, and sandbox snapshots with cloning or rollback.
- can operate Linux and KVM infrastructure for a service aimed at infrastructure teams.
Choose zeroboot if you…
- want to fork prepared Firecracker VM snapshots using copy-on-write memory.
- need Python or TypeScript SDKs, or want to try a managed code-execution API.
- can work with a prototype whose forks have no networking and use serial I/O.
Compare the numbers side by side, or add more projects
This comparison is generated with AI from the OSRepos analyses of both projects. Always check each project's repository and documentation before choosing.