> For the complete documentation index, see [llms.txt](https://docs.leather.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.leather.io/stacking-and-sbtc-reference/stacks-apps.md).

# Stacks apps

Stacks apps are apps built on Stacks smart contracts. Leather connects to them and signs their transactions.

A Stacks app is an app built on smart contracts on the Stacks blockchain. Exchanges, lending protocols, NFT marketplaces and staking services are common types.

Leather connects to Stacks apps in the browser. When you connect, the app can see your addresses. It cannot move funds without your approval: each transaction or message it asks for opens in Leather for you to check and approve.

Each app is built and run by its own team. Check what a transaction does before you approve it.

## Related

* [Connect to apps](/get-started/connect-apps.md)
* [Disconnect from apps](/get-started/disconnect-apps.md)