Cloudflare Sandboxes review

Cloudflare Sandboxes rank eighth. The docs describe two environments: Linux sandboxes where each instance is a microVM with its own kernel and network, and Dynamic Workers for JavaScript that only needs the methods your Worker provides. In both cases your Worker starts the sandbox, sends it work and decides which APIs, credentials and services it can reach, and internet traffic reaches a Linux instance only through that Worker. That model gives tight control over what an agent can touch. Guides cover running Claude Code, Codex, OpenCode and Cursor in a sandbox, cloning private repositories, preview URLs and mounting R2 buckets. Pricing follows Containers: the $5 a month Workers Paid plan includes 375 vCPU minutes, 25 GiB hours of memory and 200 GB hours of disk, then usage is billed for every 10ms a container runs. The catch is that you build around Workers and Durable Objects, which suits Cloudflare shops more than teams wanting a standalone API.

Who it is for

Developers already building on Cloudflare Workers who want sandboxes on the $5 Workers Paid plan.

Price

Requires the $5 per month Workers Paid plan, which includes 375 vCPU minutes and 25 GiB hours of memory; then usage per 10ms.

$5 USD per month Workers Paid plan
Quoted from the vendor pricing page on November 9, 2026.

Key features

• Each Linux sandbox is a microVM with its own kernel and network
• Dynamic Workers sandboxes for JavaScript that only calls methods you expose
• Your Worker holds credentials and decides which services a sandbox reaches
• Preview URLs for web servers running in a sandbox
• Mount an R2 bucket or back up a directory to R2

Strengths and weaknesses

• Strength: Lowest monthly entry price on this list at $5
• Strength: Billing every 10ms while a container is running, scaling to zero on sleep
• Strength: Guides for running Claude Code, Codex and other coding agents
• Weakness: No free plan for sandboxes
• Weakness: Requires building around Workers and Durable Objects
• Weakness: Workers, Durable Objects and logs are billed on top of container usage

Key facts

• Plan: Workers Paid, $5 a month
• Included CPU: 375 vCPU-minutes a month
• Included memory: 25 GiB-hours a month
• Included disk: 200 GB-hours a month
• Extra CPU: $0.000020 per vCPU-second

Where it ranks

Cloudflare Sandboxes is No. 7 in our Best AI Agent Sandboxes verdict.