CodeSandbox Review 2026: AI, App, Signup, Download, Alternatives & FAQs

If you have ever opened a GitHub issue and had someone reply with a link to a live demo, there is a good chance that demo was sitting on CodeSandbox. For years it has been the easy answer to a simple problem: how do I show you my code without making you install anything?

In 2026 that answer is a bit more complicated. CodeSandbox now belongs to Together AI, a few older features have been switched off, and the company's attention has clearly moved toward AI agents instead of weekend side projects. So we went through the official documentation, the pricing pages, the status page, the App Store listing, review sites and independent developer write-ups to see where the product really stands today. This is what we found.

What is CodeSandbox in 2026?

CodeSandbox is a cloud development platform. You open a browser tab, pick a template such as React, Vue, Angular or Next, and start writing code with a live preview next to it. There is nothing to install and nothing to configure. When you are done you share a link, and the other person can look at the code, run it and fork it.

Behind that simple front door there are now three layers worth knowing about:

• Browser sandboxes. Lightweight projects that run inside your browser. They do not use VM credits, which makes them free to use and the best option for quick demos.
• VM sandboxes. Full virtual machines in the cloud where you can run servers, back end code and heavier tools. These run on credits and are billed by runtime.
• The SDK. A developer toolkit for spinning up isolated microVMs from code, mainly so AI agents can run untrusted or generated code without putting anything at risk.

The company was founded in 2016 by Ives van Hoorne and Bas Buursma and launched publicly in 2017. In December 2024, Together AI announced it had completed the acquisition. At that point CodeSandbox said its infrastructure was used by more than 4.5 million developers every month. Together's stated plan was to fold the technology into its own platform as a built in code interpreter for AI models.

CodeSandbox Profile

CodeSandbox AI in 2026

This is where CodeSandbox has changed the most. The AI story here is less about a chatbot in your editor and more about what sits underneath other people's AI products.

After Together AI took over, the sandbox technology became the base for the Together Code Interpreter. The idea is that a language model can write code and then actually run it inside a secure virtual machine, whether that means charting sales data, testing an algorithm or debugging an app. The CodeSandbox SDK is how developers plug into that. It supports snapshots, forking and hibernation, so an agent can pause a machine and pick it back up later. Together's documentation says a sandbox can be created from a template in under 3 seconds, and independent write-ups put resume times from hibernation at around half a second.

That is genuinely useful for anyone building coding agents, and it is the part of the product that seems to be getting the investment. But there are some caveats you should know about:

• Rivals that compete for the same customers, including Blaxel and OpenComputer, point out that CodeSandbox sandboxes can hit standby limits of a few days, and that the newer Together SDK drops a few features some teams relied on, such as sessions and automatic hibernation timers. Take those comments with the usual grain of salt, since they come from competitors.
• The product is being rebranded as Together Code Sandbox. Together says the remaining features will move over "in the coming months", so expect some rough edges and changing docs.
• We did not find a headline AI writing assistant built into the everyday editor. If you were hoping for a Copilot style helper as the main selling point, this is not the pitch.

For everyday coders the AI angle will feel fairly quiet. For AI builders it is the whole reason to look at the platform.

CodeSandbox App: Is There One?

Short answer: not anymore. CodeSandbox for iOS was a proper native editor for iPhone and iPad, and it had a loyal following among people who liked to fix a bug on the train. The official FAQ now states that the app is no longer available because the team can no longer maintain it, and it has been taken off the App Store. If you already have it installed it should still open, but you should not expect updates. The company's own advice is to use the web editor instead.

We could not find an official Android app either. In practice, phone users will be working through a mobile browser, which is fine for reading and small edits but not much fun for real coding.

The VS Code extension has also been retired. Its Marketplace page says it is deprecated and stops working on July 15, 2026, so if your workflow depended on opening sandboxes from VS Code, that door has closed.

How to Sign Up for CodeSandbox

Signing up is still one of the easiest parts of the experience. The steps below reflect the current setup, though screens do get tweaked from time to time.

1. Go to codesandbox.io in any modern browser.
2. Choose to sign in or sign up. The official docs list GitHub, Google and Apple as the account options.
3. If you plan to import projects, link your GitHub account too. It makes importing and syncing much smoother.
4. Your personal workspace is created automatically. Teams can add a shared workspace later.
5. Pick a template or import a repository and start coding. Browser sandboxes need no credits at all.

You do not need a credit card for the free plan, and the docs say free plans never expire. Students, open source maintainers and non profits can also ask about discounted or free access through the pricing page.

CodeSandbox Download: What Can You Actually Download?

There is no desktop program to install, which is the whole point of the product. CodeSandbox runs in your browser. That said, you still have a few ways to get your work out:

• Download a sandbox as a zip file and continue working on your own machine.
• Sync with GitHub so your code always has a home outside the platform.
• Install the SDK with npm (the package is @codesandbox/sdk) if you are building on top of the platform. It is TypeScript first, and because of the move to Together, check the current docs before you start a new project.

We would treat the zip export as a habit rather than an emergency measure. Given how many features have been retired this year, keeping a local copy of anything important is just sensible.

CodeSandbox Pricing in 2026

Pricing works on credits. A credit measures VM runtime, and the official pricing pages list them at roughly 1.5 cents each, which works out to about 15 cents per hour of on demand usage. How fast you burn them depends on the VM size you choose.

• Free: about 400 credits every month. The docs describe this as enough for around 40 hours of a small React project on the smallest VM. If you run out, your VM sandboxes freeze until the next billing cycle unless you upgrade.
• Paid plans: named Pro, Build or Scale depending on which page you read, which tells you the pricing is still being reshuffled. One tracker in August 2026 listed the Scale plan from about $170 a month per workspace with 160 hours of included credits, but you should confirm the number on the official page before you pay.
• Enterprise: custom limits, single sign on and dedicated support, sold through the Together AI sales team.

One nice detail: independent coverage says credit prices dropped by about 17 percent after the acquisition. Small win for builders.

CodeSandbox User Experience

What people like

The praise has been consistent for years. Users on review sites talk about how fast it is to get going, how easy it is to collaborate in real time, and how smoothly it works with GitHub. On Capterra the product holds a 4.9 rating, though from only 7 reviews, so we would not lean on that number too hard. G2 reviewers highlight instant setup, live preview, built in package management and support for many frameworks.

The editor itself feels familiar to anyone who has used VS Code, and sharing a link to a working project is still as painless as it was a few years ago. For teaching, documentation examples and bug reproductions, it is hard to beat.

What people complain about

Reviewers mention slowdowns on large projects, limited offline use, trouble with certain dependencies and a small learning curve for total beginners. Because a browser sandbox lives in a browser tab, heavy projects will always feel more cramped than a local setup.

The bigger frustration in 2026 is change. Several products have been wound down within months of each other, which makes long term planning harder:

• CodeSandbox Repositories stopped accepting new imports on April 1, 2026. The docs say full support ends on July 1, 2026 and point users toward GitHub Codespaces. Some third party sources cite July 15, so treat it as mid July.
• CodeSandbox CI was reported as shut down on April 15, 2026.
• Sandpack, the open source component many developers embed in docs, is described by independent sources as no longer actively maintained.
• The iOS app and the VS Code extension are both retired, as covered above.

Reliability

On the positive side, the public status page showed all services operational when we checked in September 2026, with the API reporting 100 percent uptime across the recent tracking window. Support is available through documentation, a knowledge base, a forum and email.

Pros and Cons

Pros

• Nothing to install, and projects start in seconds.
• Browser sandboxes are free and do not eat into credits.
• Real time collaboration and easy link sharing.
• Good GitHub integration and lots of framework templates.
• Strong microVM infrastructure for AI agent workloads.
• Discounts for education, open source and non profits.

Cons

• The iOS app is gone and there is no Android app.
• Repositories, CI and the VS Code extension have been retired.
• Product and plan names are in flux during the move to Together AI.
• Large projects can feel slow in the browser.
• The free tier freezes VM sandboxes once credits run out.
• Not much of an in editor AI assistant.

Best CodeSandbox Alternatives in 2026

If the changes above worry you, or you simply want to compare, these are the names that come up most often in 2026 roundups.

Our Rating: 3.7 out of 5

CodeSandbox earns a 3.7 because the core experience is still excellent while the ecosystem around it has shrunk. The browser editor is quick, friendly and great for sharing. The infrastructure for AI agents is impressive. But losing the mobile app, repositories, CI and the VS Code extension in a single year, plus a product line that is still being moved under a new parent brand, keeps it from scoring higher.

Who should use it: students, educators, open source maintainers, frontend developers and AI teams who want fast, isolated environments.

Who should think twice: anyone who needs a mobile coding app or wants to build a long term workflow around repository environments.

CodeSandbox FAQs (2026)

1. Is CodeSandbox free in 2026?

Yes. There is a free plan with about 400 VM credits each month, and browser sandboxes do not use credits at all. If your VM credits run out, those VM sandboxes freeze until your next billing cycle or until you upgrade. The docs say free plans do not expire.

2. Who owns CodeSandbox?

Together AI, an AI cloud company, announced it had acquired CodeSandbox in December 2024. The product is gradually being moved under the Together brand as Together Code Sandbox.

3. Does CodeSandbox have AI features?

The AI side is mostly infrastructure. The SDK lets AI agents run code inside secure microVMs, and the technology powers the Together Code Interpreter. We did not find a major built in AI coding assistant in the standard editor, so check your dashboard if you are expecting one.

4. Is there a CodeSandbox app for iPhone or Android?

The iOS app was removed from the App Store because the team could no longer maintain it. Existing installs may still open, but there will be no updates. We found no official Android app, so mobile users should use the web editor in a browser.

5. How do I sign up for CodeSandbox?

Visit codesandbox.io and sign in with GitHub, Google or Apple. A personal workspace is created for you automatically. Link GitHub if you want to import repositories.

6. Can I download CodeSandbox?

There is no desktop program to download because it runs in the browser. You can download any sandbox as a zip file, sync it to GitHub, or install the SDK through npm if you are a developer.

7. Is CodeSandbox safe to use?

It is an established platform with a public status page, and its VM sandboxes run in isolated microVMs. Still, use common sense: keep API keys, passwords and private tokens out of public sandboxes and use environment variables or secrets instead.

8. What happened to CodeSandbox Repositories and CI?

Repositories stopped accepting new imports on April 1, 2026, with full support ending around July 2026, and CodeSandbox recommends GitHub Codespaces as the replacement. CodeSandbox CI was reported as shut down in April 2026. Browser sandboxes and VM sandboxes are still available.

9. Is CodeSandbox shutting down?

No. The status page showed services running normally in September 2026, and the technology is being carried forward under Together AI. What is happening is a cleanup: certain products have been retired while the core editor and the SDK stay alive.

10. Does CodeSandbox still work with VS Code?

The old CodeSandbox extension for VS Code is deprecated and was scheduled to stop working on July 15, 2026. You can still use the web editor, which has a VS Code style layout.

11. What is the best alternative to CodeSandbox?

It depends on what you need. StackBlitz is the closest for browser based frontend work, GitHub Codespaces suits repository based teams, Replit is friendly for beginners, and E2B or Daytona are common picks for AI agent sandboxes.

12. How much does CodeSandbox cost?

Free to start. Paid plans are billed with a mix of subscription and VM credits, at roughly 1.5 cents per credit. Plan names and prices have been shifting, so confirm the current numbers on the official pricing page before subscribing.

Nubia Magazine verdict 

This review is based on the official CodeSandbox and Together AI documentation, the pricing and FAQ pages, the public status page, the App Store and VS Code Marketplace listings, verified reviews on Capterra and G2, and independent developer comparisons published in 2026. Where sources disagreed, such as on plan names and exact shutdown dates, we said so instead of picking a side. Software changes quickly, so check the official site before you commit money.