> For the complete documentation index, see [llms.txt](https://documentation.proto.cx/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.proto.cx/docs/getting-started/signing-in.md).

# Signing in

Sign in or sign up at [v3.proto.cx](https://v3.proto.cx). Proto uses passwordless authentication — no passwords to manage or reset.

{% hint style="warning" %}
Sign-up requires a **work email address**. Personal domains (@gmail, @yahoo) and spam-flagged domains are not accepted.
{% endhint %}

***

## Sign-in methods

| Method               | How it works                                                                               |
| -------------------- | ------------------------------------------------------------------------------------------ |
| **Email magic link** | A one-click link is sent to your inbox. Follow it to sign in. Links expire after 48 hours. |
| **Google SSO**       | Single sign-on for Google-associated work email addresses.                                 |
| **Microsoft SSO**    | Single sign-on for Outlook-associated email addresses.                                     |

{% hint style="warning" %}
Always sign in using the **same method you used to sign up**. Switching methods creates a separate account.
{% endhint %}

***

## Workspace access

All accounts belong to at least one workspace. If you sign up independently — not via an invitation email — you land in a new, empty workspace by default.

To join an existing workspace, accept the invitation email sent to your account address. The workspace then appears in your workspace switcher.

***

## FAQs

<details>

<summary>I didn't receive the magic link email — what do I do?</summary>

Check your spam or junk folder and confirm the email address was entered correctly, then request a new link. Magic links expire after 48 hours. If it still doesn't arrive, ask your workspace admin to check whether Proto's sending domain is allowlisted.

</details>

<details>

<summary>I was invited to a workspace but landed in an empty one instead.</summary>

This happens when you sign up directly instead of clicking the invitation link. Ask to be re-invited to the correct workspace using your account email address. Once you accept, the workspace appears in your workspace switcher.

</details>

<details>

<summary>Can I belong to more than one workspace?</summary>

Yes. Accounts can be associated with multiple workspaces. Switch between them using the workspace selector in the top navigation.

</details>

<details>

<summary>Why was my email rejected at sign-up?</summary>

Proto only accepts work email addresses. Personal domains (Gmail, Yahoo, etc.) and domains flagged as spam sources are rejected.

</details>

<details>

<summary>Can I sign in with a password?</summary>

No. Proto is passwordless by design. Email magic link, Google SSO, and Microsoft SSO are the only supported methods.

</details>

<details>

<summary>I see a notification saying a new version is available — what should I do?</summary>

This isn't a sign-in issue. Proto ships updates frequently and shows a top-right notification when your open tab is running an older version. Select **Refresh** whenever it's convenient — see [Staying up to date](/docs/getting-started/staying-up-to-date.md).

</details>

***

## Related

{% content-ref url="/pages/8jjCgRT1GafEcGTCvJah" %}
[Data privacy](/docs/getting-started/data-privacy.md)
{% endcontent-ref %}

{% content-ref url="/pages/Qr9pei9HMblePEnopM7Q" %}
[Staying up to date](/docs/getting-started/staying-up-to-date.md)
{% endcontent-ref %}

{% content-ref url="/pages/iYbvOfviA4QyuUMR2E7a" %}
[Roles & permissions](/docs/settings/general/roles-and-permissions.md)
{% endcontent-ref %}