> For the complete documentation index, see [llms.txt](https://doc.lockerprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.lockerprotocol.com/readme.md).
# Welcome
Keep your crypto keys in a safe that never goes online, and still use them from your browser.
**Locker Protocol** is two apps that work as a team:
* **Locker Vault** — the *safe*. A free app you install on an old phone or tablet that you keep offline **forever**. It holds your keys and signs things by showing QR codes.
* **Locker Protocol Wallet** — the *window*. A browser extension that replaces MetaMask. It holds **no keys**. It only shows you what is happening and passes QR codes back and forth with the Vault.
Think of it like this: *the key to your house never leaves the house. When something needs signing, you slide a piece of paper under the door, and the signed paper comes back the same way.*
The Vault never touches the internet. The extension never touches your keys.
## Where to start
{% content-ref url="/pages/5SCdmRHuxQORemApyX2T" %}
[Set up in 3 steps](/start-here/set-up-in-3-steps.md)
{% endcontent-ref %}
{% content-ref url="/pages/UBiUDEz2tOhijKhNqrx2" %}
[How it works in 60 seconds](/start-here/how-it-works.md)
{% endcontent-ref %}
{% content-ref url="/pages/gQh8TZzFPw6aAxX0FRdE" %}
[Safety rules](/start-here/safety-rules.md)
{% endcontent-ref %}
## The two apps
| | Locker Vault | Locker Protocol Wallet |
| --------------------- | ------------------------------------------------------------ | -------------------------------------------------- |
| Where | A dedicated phone or tablet, **offline** | Chrome, Edge, Firefox, Safari |
| Holds your keys | **Yes** | **Never** |
| Talks to the internet | **Never** | Yes (balances, prices, sending) |
| Get it | [vault.lockerprotocol.com](https://vault.lockerprotocol.com) | Browser store |
| Docs | [Locker Vault](/vault/install.md) | [Browser extension](/browser-extension/install.md) |
Need help? Join the [Discord](https://discord.gg/tcNRmMTHp5).
---
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