One sign-in, you control your data and your reputation moves with you.

One account, any app

Use Certified to sign in across apps without creating new accounts or starting over. Your identity stays with you wherever you go.

Apps request access to your data, and you choose what to share, when, and with whom. Nothing moves without your permission.

Your work, activity, and endorsements build over time—and follow you across apps, so your reputation isn't tied to a single app.

Certified is built on @ AT Protocol