The walkthrough on this page covers 6 steps: 1. Open a project in CodeSandbox 2. Confirm an eligible plan 3. Opt in to AI features 4. Chat in the DevTool 5. Refactor from the preview 6. Review the suggested commit message.

What are the limitations of Boxy?

Deprecated in July 2024, so it is not a viable choice for new projects. Limited to CodeSandbox Personal Pro and Team Pro subscribers during its lifetime. Shipped as a beta, so the feature set and reliability were never finalised.

Boxy

Name: Boxy
Author: Boxy

AI coding assistant built into CodeSandbox cloud environments

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Screenshot of Boxy, AI coding assistant built into CodeSandbox cloud environments

What is Boxy?

Boxy is a code modifier tool. Boxy was CodeSandbox's built in AI assistant for its cloud IDE, handling contextual code generation, preview driven refactoring, commit message drafting and code explanations. It required a Pro plan, was opt in for privacy, and was deprecated in July 2024 in favor of Codeium.

Boxy is an AI coding assistant that lives inside CodeSandbox, the browser based cloud development environment where projects run behind a shareable URL with no local setup. Because Boxy sits inside the editor and reads the whole codebase, its answers are grounded in the actual project rather than a generic snippet pasted from elsewhere. The assistant appears in a chat panel called the DevTool, where developers ask questions, request new code, or ask for explanations of files they are reading. The standout capability is refactoring driven from the app preview. A developer clicks an element in the rendered preview, asks Boxy to change it, and the assistant locates the related code, reasons about project context, and proposes new code. Code generation works the same way: requests are matched to the stack and conventions already in the sandbox, and any file path in the reply can be clicked to open that file and insert the suggested code. Boxy also drafts commit messages by inspecting changes on a branch, with the option to regenerate or write your own. Explanations of unfamiliar code round out the set, which makes the tool as much a learning aid as a productivity one. Boxy was aimed at CodeSandbox Personal Pro and Team Pro subscribers and released as a beta. It suits developers already working in CodeSandbox, teams onboarding contributors into a shared cloud environment, and learners who want guided explanations without leaving the browser. AI features were opt in, so code was not sent to the assistant until a user deliberately enabled them, and a research program gave volunteers free access in exchange for feedback. The tool was deprecated in July 2024, and CodeSandbox now points users to Codeium for AI features; anyone evaluating it today should treat the product as legacy.

How do you use Boxy?

1Open a project in CodeSandbox
Start from a sandbox, a template such as the Next.js example, or import a GitHub repository into a cloud environment.
2Confirm an eligible plan
Boxy was offered to Personal Pro and Team Pro subscribers, so check the plan on the Pro page before expecting AI features.
3Opt in to AI features
AI access is off by default. Enable it deliberately so the assistant can read the project context it needs.
4Chat in the DevTool
Open the AI chat panel and ask for generated code, an explanation of a file, or help tracking down a bug. Click any file path in a reply to open it and insert the code.
5Refactor from the preview
Select an element in the running app preview, request a change, and review the code Boxy proposes for that element.
6Review the suggested commit message
When committing changes on a branch, check the drafted message, regenerate it if needed, or write your own before committing.

Pros and cons

Pros

Reads the full project context, so generated code and refactors match the existing codebaseAI
Refactoring starts from a click on the app preview instead of hunting for the source fileAI
Suggested commit messages are drafted from branch changes and can be regenerated or editedAI
Explanations of files and snippets support developers who are still learningAI
AI access is opt in, so code is not shared with the assistant until the user enables itAI

Cons

Deprecated in July 2024, so it is not a viable choice for new projectsAI
Limited to CodeSandbox Personal Pro and Team Pro subscribers during its lifetimeAI
Shipped as a beta, so the feature set and reliability were never finalisedAI
No standalone use outside CodeSandbox, which locks the assistant to one environmentAI
CodeSandbox now directs AI users to Codeium, leaving no migration path specific to BoxyAI

How much does Boxy cost?

Free trial

The Pro page offered a free trial route for team plans, but Boxy itself was a paid tier feature rather than a free tool.

Learn more

Pricing

Boxy was not sold separately. AI features were included with CodeSandbox Personal Pro and Team Pro subscriptions, with upgrade and trial options handled on the Pro page.

Learn more

Integrations

Boxy worked only inside CodeSandbox cloud environments, including projects imported from GitHub. No third party integrations are described on the page.

Features

Contextual code generation tuned to the sandbox, refactoring started from a click on the app preview, one click insertion of generated code via file paths in replies, automatic commit message suggestions from branch changes, and explanations of code and files. All AI features required manual opt in.

Frequently asked questions about Boxy

How much does Boxy cost?
Boxy was not sold separately. AI features were included with CodeSandbox Personal Pro and Team Pro subscriptions, with upgrade and trial options handled on the Pro page.
Does Boxy offer a free trial?
The Pro page offered a free trial route for team plans, but Boxy itself was a paid tier feature rather than a free tool.
How do you use Boxy?
The walkthrough on this page covers 6 steps: 1. Open a project in CodeSandbox 2. Confirm an eligible plan 3. Opt in to AI features 4. Chat in the DevTool 5. Refactor from the preview 6. Review the suggested commit message.
What platforms does Boxy support?
Boxy is available on Web App.
What does Boxy integrate with?
Boxy worked only inside CodeSandbox cloud environments, including projects imported from GitHub. No third party integrations are described on the page.
What are the limitations of Boxy?
Deprecated in July 2024, so it is not a viable choice for new projects. Limited to CodeSandbox Personal Pro and Team Pro subscribers during its lifetime. Shipped as a beta, so the feature set and reliability were never finalised.