agent-infrastructure🔴Developer

CubeSandbox

Name: CubeSandbox
Brand: CubeSandbox
Availability: InStock

Open-source sandbox service from Tencent Cloud that spins up hardware-isolated micro-VMs for AI agents in under 60ms, with E2B SDK compatibility for drop-in migration.

Starting atFree

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In Plain English

Open-source sandbox service from Tencent Cloud that spins up hardware-isolated micro-VMs for AI agents in under 60ms, with E2B SDK compatibility for drop-in migration.

Overview

CubeSandbox is Tencent Cloud's Apache-2.0 sandbox for AI agents — Rust + RustVMM/KVM micro-VMs with sub-60ms cold start, hardware isolation, E2B SDK compatibility, CubeCoW snapshots, egress control, and a Terraform one-click cluster deploy. Free to self-host.

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Key Features

Feature information is available on the official website.

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Pricing Plans

Open Source

Free

✓Apache 2.0 licensed, self-hosted
✓Single-node or multi-node cluster deployment
✓All features included: snapshots, credential vault, egress control, web console

See Full Pricing →Free vs Paid →Is it worth it? →

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Best Use Cases

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Self-hosted E2B alternative

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High-density agent sandboxing

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RL rollouts with snapshots

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Code-interpreter backends

Pros & Cons

✓ Pros

✓Hardware isolation (dedicated guest kernel) is a real security win over Docker
✓Sub-60ms start and <5MB overhead make thousands of concurrent sandboxes viable
✓E2B SDK drop-in means zero-code migration for existing users
✓Snapshot/rollback is a killer feature for RL training and SWE-Bench rollouts
✓Apache 2.0, self-hosted, and CNCF-listed — no vendor lock-in

✗ Cons

✗Self-hosting on Linux + KVM is real ops work vs. a managed service
✗Windows/macOS hosts need a Linux VM in the loop for local dev
✗No MCP server yet — integration is via the REST API/SDK only
✗New project relative to E2B, so ecosystem/tooling is thinner
✗Cluster deploy needs Terraform familiarity for anything past single-node

Frequently Asked Questions

How much does CubeSandbox cost?+

CubeSandbox pricing starts at Free. They offer a single pricing plan including a free option.

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Quick Info

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More about CubeSandbox

Pricing Review Alternatives Free vs Paid Pros & Cons Worth It?Tutorial

Pros & Cons

✓ Pros

✓Hardware isolation (dedicated guest kernel) is a real security win over Docker
✓Sub-60ms start and <5MB overhead make thousands of concurrent sandboxes viable
✓E2B SDK drop-in means zero-code migration for existing users
✓Snapshot/rollback is a killer feature for RL training and SWE-Bench rollouts
✓Apache 2.0, self-hosted, and CNCF-listed — no vendor lock-in

✗ Cons

✗Self-hosting on Linux + KVM is real ops work vs. a managed service
✗Windows/macOS hosts need a Linux VM in the loop for local dev
✗No MCP server yet — integration is via the REST API/SDK only
✗New project relative to E2B, so ecosystem/tooling is thinner
✗Cluster deploy needs Terraform familiarity for anything past single-node