Very often I see users struggling with the absolute worst part of the internet: Passwords . They forget them. They use "Password123" and get hacked. They get annoyed when your app forces them to include a special character and an uppercase letter. As a solo developer, building "Forgot Password" flows and dealing with compromised accounts is a massive waste of time. In 2026, the industry is finally killing the password. Apple, Google, and Microsoft have all standardized Passkeys (WebAuthn). This means your users can log into your Rails app using their laptop's TouchID, FaceID, or Windows Hello. It is incredibly secure (phishing-proof) and the UX is magical. Adding this to a Rails app sounds terrifying because cryptography is hard. But thanks to the webauthn gem, we can implement it without needing a PhD in math. Here is the step-by-step guide to adding Passkeys to your Rails app. The Mental Model: How Passkeys Work Before we write code, you must understand the flow.…