Signing in
Login steps for Proto.
Sign in or sign up at v3.proto.cx. Proto uses passwordless authentication — no passwords to manage or reset.
Sign-up requires a work email address. Personal domains (@gmail, @yahoo) and spam-flagged domains are not accepted.
Sign-in methods
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.
Always sign in using the same method you used to sign up. Switching methods creates a separate account.
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
I didn't receive the magic link email — what do I do?
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.
I was invited to a workspace but landed in an empty one instead.
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.
Can I belong to more than one workspace?
Yes. Accounts can be associated with multiple workspaces. Switch between them using the workspace selector in the top navigation.
Why was my email rejected at sign-up?
Proto only accepts work email addresses. Personal domains (Gmail, Yahoo, etc.) and domains flagged as spam sources are rejected.
Can I sign in with a password?
No. Proto is passwordless by design. Email magic link, Google SSO, and Microsoft SSO are the only supported methods.
I see a notification saying a new version is available — what should I do?
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.
Related
Data privacyStaying up to dateRoles & permissionsLast updated