6 free alternatives to CodeSandbox

PHPSandbox gives you a free online PHP sandbox with 10 notebooks, 5 minutes timeout per notebook, 1 GB storage per notebook, 1 GB memory per notebook, public repositories, and community support. It is free for browser-based PHP work and sharing small examples, with notebook-based isolation rather than a workspace model. It beats CodeSandbox on specificity if you only need PHP, because the whole free plan is centered on that workflow instead of a broader multi-language environment. It falls short on collaboration scale and runtime capacity, since its free tier is much smaller in notebook count and resource limits. Switch if you mainly prototype PHP snippets and do not need CodeSandbox's broader sandbox model.

• Beats CodeSandbox: More focused on PHP-specific notebook workflows
• Falls short: Far less workspace scale and runtime headroom
• Who should switch: Switch if your free work is mostly PHP notebooks and you do not need broad sandbox collaboration.

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GetVM's free tier includes up to 5 VMs per day, a container VM with 1 core and 2GB RAM, no internet access, and no persistence. That makes it a simple choice for short-lived practice sessions and throwaway environments launched from the browser. It beats CodeSandbox on friction for quick daily VMs because the free plan gives a clear per-day allowance and requires no persistence overhead. It falls short on staying power and collaboration, since you lose internet access and persistent state entirely. If your main need is to spin up isolated Linux workspaces for brief tasks, GetVM is the cleaner fit; if you need ongoing sandboxes or team workspaces, CodeSandbox is better.

• Beats CodeSandbox: Clear daily VM allowance for short-lived sessions
• Falls short: No internet access and no persistence
• Who should switch: Switch if you only need disposable VM sessions for practice or testing.

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lil'bots lets you create unlimited bots, use thousands of prebuilt bots from the bot hub, and spend 3,600 execution seconds per month for free. The free plan is attractive if your work is bot or script oriented, especially when you want to start building without worrying about a small creation cap. It beats CodeSandbox on creation freedom for that specific use case, since unlimited bots is a simpler free constraint than a workspace member limit plus VM-hour budget. It falls short on runtime allowance and general-purpose sandboxing, because the free execution pool is still capped and the product is built around bots rather than broad development environments. Switch if you are shipping small AI or automation bots more than general code prototypes.

• Beats CodeSandbox: Unlimited bot creation on the free plan
• Falls short: Much smaller execution pool than CodeSandbox's VM hours
• Who should switch: Switch if you are building bots or scripts and want unlimited free creation.

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StackBlitz's free plan gives you unlimited public StackBlitz projects, unlimited public collections, and unlimited public GitHub repositories, with free access to view and edit public work. It is a good fit when your work can stay public and you want a browser IDE without worrying about project count. It beats CodeSandbox on unbounded public project volume, because the free tier does not impose the same workspace member or VM-hour style cap for public content. It falls short on privacy and team workflows, since the free tier is centered on public assets. If your main need is to host or edit public web projects with no project ceiling, StackBlitz is the easier free choice.

• Beats CodeSandbox: Unlimited public projects and public GitHub repos
• Falls short: Public-only focus instead of private team workspaces
• Who should switch: Switch if your code can stay public and you want no project-count ceiling.

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Azure Container Apps free tier includes the first 180,000 vCPU-seconds, 360,000 GiB-seconds, and 2 million requests per subscription each month. That gives you a recurring usage allowance suited to containerized APIs, jobs, and event-driven workloads. It beats CodeSandbox on raw compute headroom because the free grants are large and reset monthly, which can support backend-style workloads better than a small member-based workspace cap. It falls short on ease of use for browser-first development, since this is a cloud container service rather than an interactive IDE. Switch if you need free runtime for deployed services more than an in-browser coding workspace.

• Beats CodeSandbox: Much larger recurring compute and request allowance
• Falls short: Not an in-browser IDE or sandboxed coding workspace
• Who should switch: Switch if your free need is running containerized services, not editing code in the browser.

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Visual Studio Code is free to use with any number of copies, extension downloads from the marketplace, automatic updates, and demo use. There is no free-tier ceiling to outgrow, so it works as a permanent local or web editor for developers who do not need hosted sandboxes. It beats CodeSandbox on headroom because the product is always free and unbounded for editor use. It falls short on browser-hosted execution, managed sandboxes, and built-in cloud collaboration, which are the core reasons many people choose CodeSandbox in the first place. Switch if you want the broadest zero-cost editing setup and are fine supplying your own runtime or deployment path.

• Beats CodeSandbox: No free-tier ceiling at all for editor use
• Falls short: No hosted sandboxes or built-in cloud runtime
• Who should switch: Switch if you want a permanent free editor and can run code elsewhere.

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