CodeSandbox review

CodeSandbox is a hosted environment for creating and running isolated code sandboxes—not just a browser editor for sharing frontend demos. Its APIs let teams create development environments to run different types of code, including untrusted code. The homepage positions the product for AI agents, code interpretation and evaluations, development environments, and CI/CD workflows.

The basic idea is to start a virtual machine for a task, then pause and resume it without rebuilding the environment from scratch. CodeSandbox says snapshots let you resume work after inactivity, and that VMs can start, clone, or restore from snapshots within two seconds. You can also set how long an inactive sandbox waits before hibernating.

That is a different buying case from the shareable React projects discussed in an older Reddit thread: the current pitch is sandbox infrastructure teams can integrate into their own products and workflows.

The appeal is the infrastructure layer: CodeSandbox says sandboxes isolate code from your system, including untrusted code, while snapshots provide a way to resume environments after inactivity. The homepage says VMs can start, clone, or restore from snapshots within two seconds, and that the service can handle millions of concurrent VMs. Those are vendor claims, not independent performance results.

The free Build plan gives individuals and small teams a way to start: it costs $0 and includes unlimited Browser and VM Sandboxes/Devboxes, up to five members, and VMs up to 4 vCPUs and 8 GiB RAM. The catch is that usage is limited to 40 VM-credit hours monthly and 10 concurrent VMs.

For teams building with the SDK, Scale (Builder) lists full CodeSandbox SDK access, 10,000 hourly SDK requests, and 100–250 concurrent VMs. It starts at $170 per workspace monthly, or $119 per workspace monthly with annual billing, according to the published pricing information. That is a clear tier for teams that need more than an occasional sandbox.

The free plan’s “unlimited” sandboxes do not mean unlimited compute. Build includes up to 40 VM-credit hours monthly (400 credits), 10 concurrent VMs, and machines capped at 4 vCPUs and 8 GiB RAM. Teams can hit those limits quickly if they keep many environments active or run heavier workloads.

Pro raises the allowance to a starting 100 VM-credit hours monthly and allows VMs up to 16 vCPUs and 32 GiB RAM, but costs $12 per workspace monthly, or $9 with annual billing. The pricing information lists Scale at $170 monthly or $119 annually, with 160 VM-credit hours to start (1,100 credits). Extra Pro and Scale VM credits cost $0.15–$0.18 per hour, according to the pricing information.

Full SDK access is listed on Scale, so teams whose main requirement is SDK integration face a much higher starting price than the free or Pro tiers. Enterprise pricing is custom and not published; infrastructure options and VM allocations depend on the agreement.

CodeSandbox’s Build plan is free, but includes up to 40 VM-credit hours and 10 concurrent VMs per month. Pro costs $12 per workspace monthly, or $9 with annual billing. Scale (Builder) jumps to $170 monthly, or $119 annually—about 14 times Pro’s monthly list price. That tier is where full CodeSandbox SDK access starts, alongside 10,000 hourly SDK requests and 100–250 concurrent VMs.

Pro and Scale prices are lower with annual billing; the pricing details don’t publish an annual price for Build or Enterprise. Pro and Scale users can buy on-demand VM credits for $0.15–$0.18 per hour, or $0.01486–$0.015 per credit. Enterprise pricing is custom, so there’s no public figure to compare. If you need the SDK, budget for Scale; if you only need occasional sandboxes, check whether Build’s VM-hour cap is enough before committing.

The migration question depends on whether you use CodeSandbox as a development environment or build around its SDK. Before moving, inventory your SDK integrations, VM-credit use, concurrency needs, and any workflows that depend on snapshots or custom hibernation. The published product and pricing information doesn’t describe a migration tool, data-export format, or a process for transferring snapshots, so confirm those details with CodeSandbox before planning a cutover.

The published sources also contain no Reddit posts, so we can’t responsibly summarize Reddit users’ reasons for leaving. For a switch away, treat export and snapshot portability as open questions rather than assuming a sandbox can be resumed elsewhere. For a switch to CodeSandbox, check whether your required VM capacity fits the plan: Build allows 10 concurrent VMs, while Scale lists 100–250. If your setup needs more, Enterprise offers custom allocations, but its pricing is not published.