CodeSandbox
CodeSandbox is a web and iOS service for creating development environments that run code, with an SDK for starting those environments programmatically.
What CodeSandbox is
CodeSandbox is a web and iOS service for creating development environments that run code, with an SDK for starting those environments programmatically. Each environment runs in isolation, which the service presents as a safer way to execute untrusted code. Its microVMs can be started, cloned, or restored from snapshots within two seconds; snapshots also let developers resume work in the same sandbox after inactivity. Users can set how long an environment stays inactive before automatic hibernation. Teams can run multiple agents in parallel in separate environments and fork work to compare agents through A/B testing. Tests can run in sandboxes for CI/CD and the environments can hibernate when testing ends. Other ecosystem features include Sandpack for live browser coding, a VS Code extension, and a Storybook code playground for each story. CodeSandbox says it can handle millions of concurrent VMs. Founded in 2017 and headquartered in Amsterdam, CodeSandbox BV is a Together AI company, and the companies joined forces on the CodeSandbox SDK.
Good
- Isolated environments for untrusted code execution
- Snapshots support resuming work after inactivity
- Parallel agents can run without interference
- Sandpack enables live coding in a browser
- Free plan is available
Watch out
- Automatic hibernation applies after inactivity
Who it suits
CodeSandbox suits developers and teams that need programmatically created, isolated environments for code execution, agent work, or CI/CD tests. Its browser coding, VS Code, and Storybook features may also suit web development workflows.
Verdict
CodeSandbox combines isolated development environments with tools for snapshots, parallel agents, and CI/CD testing. A free plan is available, while the listed paid tiers have no stated prices.
Plans and prices
From CodeSandbox's own pricing page, checked 22 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Build | — | 5 members · 40 hours monthly VM credits · 4 vCPUs · 8 GiB RAM |
| Scale | — | 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 |
| Enterprise | — | Unlimited members · Custom storage · Custom hourly request limits · 64 vCPUs · 128 GiB RAM |
The facts
Each one read from CodeSandbox's own pages, with the date it was checked.
What it does
- Agent A/B testing
- Forking supports A/B testing of different agents.checked 27 Sep 2026
- CI/CD support
- Tests can run inside sandboxes, which can hibernate after completion.checked 27 Sep 2026
- Code isolation
- Every environment runs in isolation for safer untrusted code execution.checked 27 Sep 2026
- Code scale
- The page reports more than 0.0 billion lines of code written.checked 27 Sep 2026
- Hibernation control
- Users can customize inactivity periods before automatic hibernation.checked 27 Sep 2026
- Parallel agents
- Multiple agents can run in parallel without interfering with each other.checked 27 Sep 2026
- SDK purpose
- Programmatically spin up dev environments for instant code execution.checked 27 Sep 2026
- Snapshot resume
- Development can resume in the same sandbox after inactivity using snapshots.checked 27 Sep 2026
- Storybook integration
- Storybook Integration provides a code playground for every story.checked 27 Sep 2026
- Together AI relationship
- CodeSandbox is now part of Together AI and joined forces on CodeSandbox SDK.checked 27 Sep 2026
- VM scalability
- The service says it can handle millions of concurrent VMs.checked 27 Sep 2026
- VM start speed
- MicroVMs can be spun up, cloned, and restored from snapshots within 2 seconds.checked 27 Sep 2026
- VS Code support
- CodeSandbox lists a VS Code Extension as an ecosystem feature.checked 27 Sep 2026
Where it runs
- Browser coding
- Sandpack enables live coding in the browser.checked 27 Sep 2026
The company
- Company identity
- CodeSandbox BV is identified as a Together AI company.checked 27 Sep 2026
- Founded
- 2017checked 28 Sep 2026
- Headquarters
- Amsterdam, Netherlandschecked 28 Sep 2026
Money
- Free access
- The page offers free starts and trials.checked 27 Sep 2026
- Free plan
- Yeschecked 22 Sep 2026
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