> ## Documentation Index
> Fetch the complete documentation index at: https://support.bolt.new/llms.txt
> Use this file to discover all available pages before exploring further.

# FAQs

> Quick answers to common questions about getting started, building with Bolt, and your account.

## Getting started

<Accordion title="Do I need to download or install any software to use Bolt?">
  No. Bolt is a browser-based tool. Sign up at [bolt.new](https://bolt.new/) and start building right away. No setup or installation is required, but we recommend you use a [supported browser](/concepts/supported-technologies#supported-browsers) for the best experience.
</Accordion>

<Accordion title="What's the difference between Bolt and StackBlitz?">
  Bolt is an AI-powered builder for websites, web apps, mobile apps, and prototypes. StackBlitz is the company behind Bolt and [WebContainers](https://webcontainers.io/), the technology that lets Bolt run entirely in your browser.

  Bolt also links with StackBlitz for account and project management, so some account actions, like resetting your email, happen through StackBlitz.
</Accordion>

## How Bolt works

<Accordion title="What are WebContainers, and how does Bolt use them?">
  Bolt runs on WebContainers, a browser-based technology built by StackBlitz that runs a full development environment directly in your browser. This is why Bolt doesn't require any installation or local setup, and why it works the same way on Windows, Mac, or any other operating system.

  For the technical details behind WebContainers, see the [StackBlitz developer documentation](https://developer.stackblitz.com).
</Accordion>

<Accordion title="Does Bolt have an API?">
  Bolt doesn't currently have a public API, CLI, or SDK to control it programmatically from outside the product.
</Accordion>

## Building

<Accordion title="Can I build a mobile app with Bolt?">
  Yes. Bolt can build mobile apps using the Expo integration. Include the words `mobile app` in your first prompt so Bolt sets up an Expo-compatible project from the start.

  See [Expo](/integrations/expo) for setup steps and details.
</Accordion>

<Accordion title="How do I add sign-up and login to my app?">
  You can ask Bolt with a prompt like this: `Create user accounts via email sign-up and login, then add account log in/log out buttons in the top right corner of the home page.` This allows Bolt to authenticate users, which requires your project to have a database. If it doesn't already, you'll see that Bolt sets one up.

  See [Add login and sign-up to your app](/cloud/database#add-login-and-sign-up-to-your-app) for the full example, and [Authentication](/cloud/database/authentication) to control how users sign in (for example, using email or Google).
</Accordion>

<Accordion title="Why did Bolt only build part of what I asked?">
  This usually happens when one large prompt asks for too many changes at once. Break big requests into a series of smaller prompts, or use Plan Mode to work out a build strategy with Bolt before it writes any code.

  See [Bolt didn't do everything you asked in your prompt](/troubleshooting/issues#bolt-didnt-do-everything-you-asked-in-your-prompt) and [Plan Mode](/best-practices/plan-mode).
</Accordion>

<Accordion title="How do I undo a change or restore an earlier version?">
  Bolt automatically saves a version of your project after every prompt that processes. You can restore an earlier version from Version History.

  See [Version History](/building/using-bolt/rollback-backup#restore-using-version-history) for the full steps.
</Accordion>

<Accordion title="How do I publish my project?">
  Open the **Publish** menu and click **Publish**. Bolt hosts your site for free at a `bolt.host` address, and using the Publish button itself doesn't use any tokens.

  See [Publish your project](/cloud/hosting/publish) for the full steps, including how to publish your site as private.
</Accordion>

## Troubleshooting

<Accordion title="My preview shows a blank, gray, or white screen. How do I fix it?">
  1. Hard refresh the page:

  * On Mac, press Cmd + Shift + R.
  * On Windows, press Ctrl + Shift + R.

  2. Try opening the project in a new tab.
  3. If the preview still doesn't show, prompt Bolt: `The preview is not showing, fix this.`

  If the problem persists, see [Preview issues](/troubleshooting/preview-issues) for more troubleshooting steps.
</Accordion>

<Accordion title="Does closing the browser tab delete my project?">
  No. Closing your browser tab doesn't affect the work you've done in Bolt. Go back to Bolt, and in the left sidebar, click **Projects**. This shows all the projects you've created.

  If you still can't find it, see [Project missing after signing in](/troubleshooting/issues#projects-missing-after-signing-in) for more troubleshooting steps.
</Accordion>

## Accounts and subscriptions

<Accordion title="What's included in the Free plan?">
  The Free plan lets you build and publish projects at no cost, with a few limits. The Free plan is best for small personal projects and experimenting with AI development.

  * **Tokens**: You get 300K tokens per day, up to a maximum of 1 million tokens a month. Unused tokens don't [roll over](/account-and-subscription/tokens#token-rollover). The 300K daily token limit refreshes each day.
  * **Hosting**: You can publish projects to a free `bolt.host` URL, with up to 10 GB of bandwidth and 333,333 web requests per month. There's no way to increase these limits, so if you go over this usage, your site goes offline for the rest of the month. See [Bolt Cloud hosting plans](/cloud/hosting/plans) for details.
  * **Branding**: Free plan projects show a **Made in Bolt** badge on the published site. Upgrading to a paid plan removes the badge.
  * **Custom domains**: Custom domains aren't available on the Free plan.
  * **Databases**: There's no limit to how many databases you can have on the Free plan.
  * **Collaboration**: You can [share your projects](/building/using-bolt/sharing) with others and give them viewer, editor, or co-owner access. Collaborators who edit the project use tokens from their own account.
</Accordion>

<Accordion title="Can I get a refund?">
  Bolt subscriptions are non-refundable, as stated in Bolt's Terms of Service. Contact [support@bolt.new](mailto:support@bolt.new) if you have questions about your subscription.
</Accordion>

<Accordion title="How do I cancel my Bolt subscription?">
  You can cancel your subscription at any time. Your plan stays active until the end of your current billing period, then cancellation takes effect at the start of your next billing period.

  See [Cancel a subscription](/account-and-subscription/billing#cancel-a-subscription) for the full steps. For problems with or questions about canceling, [contact support](/troubleshooting/contact-support).
</Accordion>

<Accordion title="How do I delete my Bolt account?">
  You can delete your account by signing in to [StackBlitz](https://stackblitz.com/sign_in), then going to **Settings** > **Profile** > **Delete my account**.

  See [Delete your account](/account-and-subscription/account-management#delete-your-account) for the full steps.

  Deleting your account is permanent and deletes the projects in your account as well.
</Accordion>