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SPECIFICTION
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CodeSandbox

codesandbox.io

WebiOS
Visit codesandbox.io
Spec score 7.7 #10 of 26 in Sandbox Software

What it is

CodeSandbox is a web and iOS service for creating isolated development environments that execute code. Its SDK can spin up environments programmatically, while microVMs can be started, cloned, or restored from snapshots within two seconds. Snapshots let work resume in the same sandbox after inactivity, and users can set the inactivity period before automatic hibernation. Multiple agents can run in parallel without interfering, and forking supports A/B testing of different agents. Tests can run inside sandboxes for CI/CD, with environments able to hibernate after completion. Sandpack provides live browser coding, Storybook Integration creates a playground for each story, and CodeSandbox lists a VS Code extension. The service says it can handle millions of concurrent VMs. CodeSandbox was founded in 2017, is headquartered in Amsterdam, and CodeSandbox BV is a Together AI company.

Spec sheet

Free plan
YesRead 22 Sep 2026 · codesandbox.io
Headquarters
Amsterdam, NetherlandsRead 28 Sep 2026 · codesandbox.io
Founded
2017Read 28 Sep 2026 · codesandbox.io
Agent A/B testing
Forking supports A/B testing of different agents.Read 27 Sep 2026 · codesandbox.io
Browser coding
Sandpack enables live coding in the browser.Read 27 Sep 2026 · codesandbox.io
CI/CD support
Tests can run inside sandboxes, which can hibernate after completion.Read 27 Sep 2026 · codesandbox.io
Code isolation
Every environment runs in isolation for safer untrusted code execution.Read 27 Sep 2026 · codesandbox.io
Code scale
The page reports more than 0.0 billion lines of code written.Read 27 Sep 2026 · codesandbox.io
Company identity
CodeSandbox BV is identified as a Together AI company.Read 27 Sep 2026 · codesandbox.io
Free access
The page offers free starts and trials.Read 27 Sep 2026 · codesandbox.io
Hibernation control
Users can customize inactivity periods before automatic hibernation.Read 27 Sep 2026 · codesandbox.io
Parallel agents
Multiple agents can run in parallel without interfering with each other.Read 27 Sep 2026 · codesandbox.io
SDK purpose
Programmatically spin up dev environments for instant code execution.Read 27 Sep 2026 · codesandbox.io
Snapshot resume
Development can resume in the same sandbox after inactivity using snapshots.Read 27 Sep 2026 · codesandbox.io
Storybook integration
Storybook Integration provides a code playground for every story.Read 27 Sep 2026 · codesandbox.io
Together AI relationship
CodeSandbox is now part of Together AI and joined forces on CodeSandbox SDK.Read 27 Sep 2026 · codesandbox.io
VM scalability
The service says it can handle millions of concurrent VMs.Read 27 Sep 2026 · codesandbox.io
VM start speed
MicroVMs can be spun up, cloned, and restored from snapshots within 2 seconds.Read 27 Sep 2026 · codesandbox.io
VS Code support
CodeSandbox lists a VS Code Extension as an ecosystem feature.Read 27 Sep 2026 · codesandbox.io

Plans and prices

Build Price not published 5 members · 40 hours monthly VM credits · 4 vCPUs · 8 GiB RAM Read 22 Sep 2026 · codesandbox.io
Scale Price not published 20 members · 160 hours monthly VM credits · 1,000 new Sandboxes per hour · 250 concurrent VMs · 10,000 SDK requests per hour · 16 vCPUs and 32 GiB RAM Read 22 Sep 2026 · codesandbox.io
Enterprise Price not published Unlimited members · Custom storage · Custom hourly request limits · 64 vCPUs · 128 GiB RAM Read 22 Sep 2026 · codesandbox.io

Every CodeSandbox plan and price →

Strong points and limits

Strong points

  • Isolated environments for untrusted code
  • MicroVM snapshots restore within two seconds
  • Parallel agents run separately
  • Sandbox-based CI/CD tests
  • Web and iOS platforms

Limits

  • Resource limits vary by listed plan
  • Automatic hibernation follows inactivity settings

Who it suits

CodeSandbox suits developers and teams that need isolated, resumable environments for execution, testing, parallel agents, or browser coding. It offers web and iOS access plus SDK-based environment creation.

Verdict

CodeSandbox combines isolated execution, snapshots, parallel agents, and CI/CD sandboxes with browser-oriented tools. Prospective teams must request or otherwise determine pricing for the listed plans and evaluate their resource limits.

Where Specifiction places it

Alternatives to CodeSandboxAll alternatives →

E2B From $150/mo · Free plan 9.1 Visit