# Introduction to users in Stacker

Stacker allows you to share your apps confidently with colleagues, other teams within your organization, and external partners and customers.

You can add users to your apps and control how different users can see and edit your data using Stacker's [Permissions](https://docs.stackerhq.com/stacker-classic/permissions-and-security/configure-a-permission-rule/table-permissions) and [User Roles.](https://docs.stackerhq.com/stacker-classic/permissions-and-security/set-up-user-roles)

![Screenshot\_2022-05-09\_at\_17.20.39.png](https://support.stackerhq.com/hc/article_attachments/6120476141203/Screenshot_2022-05-09_at_17.20.39.png)

## App Users- Collaborators and Guest Users

In Stacker, there are two distinct types of users that can have access to your apps through your workspace: [guest users](https://docs.stackerhq.com/stacker-classic/users) or [workspace collaborators](https://docs.stackerhq.com/stacker-classic/users/users-workspace-collaborators).

### Workspace Collaborators:

* Can access all the apps they are granted access to via the app bar
* Can have Roles and Permissions applied to them
* Can create their own apps in the workspace
* Can be made admins on existing apps
* Can login using SSO (Enterprise only)

### Guest Users:

* Can access all the apps they are granted access to via the app bar
* Can have Roles and Permissions applied to them
* Can be synced in from a user table in your data source
* Cannot create their own apps
* Cannot be made admins on existing apps
* Cannot login using SSO

## Next Steps

* [Add guest users to your app(s).](https://docs.stackerhq.com/stacker-classic/users/users-app-users)
* [Add workspace collaborators to your app(s).](https://docs.stackerhq.com/stacker-classic/permissions-and-security/configure-a-permission-rule/table-permissions)
* [Learn about Permissions in Stacker.](https://support.stackerhq.com/hc/en-us/articles/4409598249619)‍


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.stackerhq.com/stacker-classic/users/introduction-to-users-in-stacker.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.