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

# Apps

> Crevio doesn't just build websites -- describe a tool your business needs and it builds a real, working web app, then hosts it and changes it whenever you ask.

Crevio builds more than marketing websites. Describe a tool your business needs and Crevio's AI builds you a real, working **web app** -- one that does something, not just one that shows something. Same as everywhere else in Crevio: you say what you want in plain words, and Crevio makes it.

You never touch code, servers, or hosting. You talk to Crevio like you would a developer who never sleeps, and it builds, publishes, and looks after the app for you.

## Why you'd use this

* **You need a tool, not just a page.** Something people can actually *use* -- book a slot, log in to an account, look something up, calculate a result.
* **You are not technical.** No code, no databases to wire up, no hosting to buy. Crevio handles all of it.
* **You want it to keep up with you.** As your business changes, you just ask Crevio to change the app -- no rebuilding from scratch.

<Note>
  The golden rule of Crevio still applies: when in doubt, just ask. If you can describe the tool in a sentence, Crevio can usually build it.
</Note>

## What you can build

Apps are open-ended, but here are common ones to spark ideas:

| App                          | What it does                                                                           |
| ---------------------------- | -------------------------------------------------------------------------------------- |
| **Booking tool**             | Let customers see your availability and book a time, with confirmations and reminders. |
| **Client portal**            | A private, logged-in area where your customers view their orders, files, or progress.  |
| **Members area**             | Gated content and a community space for paying members.                                |
| **Directory**                | A searchable, filterable list -- of listings, providers, resources, or anything else.  |
| **Calculator or quote tool** | Visitors enter a few details and get an instant price, estimate, or result.            |
| **Interactive dashboard**    | A live view of the numbers that matter to you or your customers.                       |
| **Simple internal tool**     | A small app for you and your team to track or manage something day to day.             |

<Tip>
  Not sure whether something counts as an "app"? Just describe what you want it to *do* -- "let people book a 30-minute call and pay a deposit" -- and Crevio figures out the rest.
</Tip>

## Ask Crevio to build it

<Steps>
  <Step title="Describe what it should do">
    Open Crevio and explain the tool in your own words -- who uses it and what happens when they do. For example:

    *"Build me a booking app where clients pick a service, choose a time from my calendar, and pay a deposit up front."*
  </Step>

  <Step title="Add the look and feel">
    Mention a style if you have one in mind, or leave it out and Crevio will match it to your business.
  </Step>

  <Step title="Let Crevio build it">
    Crevio assembles the real, working app -- the screens, the logic, and the data it needs to remember. You can watch the progress as it goes.
  </Step>

  <Step title="Try it out">
    When it's ready, Crevio shows you a preview. Click around and use it like a customer would. Nothing is final -- anything can be changed by asking.
  </Step>
</Steps>

## It's a real app, not a mockup

The apps Crevio builds are the real thing:

* **They remember data.** Bookings, submissions, accounts, and anything else your app collects are saved and stay put.
* **They're hosted for you.** Crevio publishes the app and keeps it online -- no separate hosting to set up or pay for.
* **They live on your web address.** Use the free `yourname.crevio.app` address or [connect your own custom domain](/features/domains).
* **You control who gets in.** Make an app public, limit it to signed-in customers, or keep it to your team while you build. See [choosing who can see your site](/features/sites#choose-who-can-see-your-site).

## Change anything by asking

Once your app exists, improving it is just a conversation -- the same as with your website:

* *"Add a cancellation option to the booking flow."*
* *"Send me an email whenever someone signs up."*
* *"Show the busiest days at the top of the dashboard."*
* *"Let members edit their own profile."*

Crevio makes the change and shows you the result. If it's not quite right, ask again.

## If something goes wrong

<AccordionGroup>
  <Accordion title="The app doesn't do quite what I meant">
    Tell Crevio what should happen instead, in plain words -- "when someone books, it should also ask for their phone number." Crevio adjusts the behavior. The clearer you are about what should happen, the closer the next version gets.
  </Accordion>

  <Accordion title="A change broke something">
    Just ask Crevio to undo it or try another approach: *"That's not what I meant -- go back to how it worked and instead add the field to the second step."*
  </Accordion>

  <Accordion title="I'm not sure how to describe the app I want">
    Start with the outcome: what should a person be able to do, and what should happen when they do it? You can also ask Crevio for ideas -- *"What kind of app would help a cleaning business take bookings?"* -- and build from there.
  </Accordion>
</AccordionGroup>

## Related

<CardGroup cols={2}>
  <Card title="Your AI website" icon="browser" href="/features/sites">
    The same describe-it-and-it's-built approach, for your website.
  </Card>

  <Card title="Your own web address" icon="link" href="/features/domains">
    Put your app on a custom domain you own.
  </Card>

  <Card title="Automations & tasks" icon="robot" href="/features/automation">
    Have your AI assistant do recurring work behind the scenes.
  </Card>

  <Card title="How Crevio works" icon="circle-info" href="/introduction/how-crevio-works">
    The simple mental model behind everything Crevio builds.
  </Card>
</CardGroup>