User authentication has evolved beyond passwords. Three modern approaches dominate: OAuth social login, magic links, and passkeys. Each balances security, convenience, and implementation differently.
Authentication Methods Overview
OAuth / Social Login
Users sign in with an existing account (Google, GitHub, Apple). The identity provider handles authentication.
Magic Links
Users enter their email. They receive a link that logs them in when clicked. No password needed.
Passkeys
Biometric or device-based authentication using WebAuthn. Users authenticate with fingerprint, face, or device PIN.
Detailed Comparison
| Factor | OAuth Social Login | Magic Links | Passkeys |
|---|---|---|---|
| User friction | Low (1-2 clicks) | Medium (check email) | Very low (biometric) |
| Password needed | No | No | No |
| Email required | Depends on provider | Yes | No |
| Phishing resistant | Moderate | Low (link can be phished) | Very high |
| Account recovery | Via identity provider | Send new magic link | Device-dependent |
| Implementation complexity | Medium | Low | High |
| Third-party dependency | Yes (Google, GitHub, etc.) | Email delivery | Browser/OS support |
| Conversion rate impact | Highest (familiar flow) | Lower (email delay) | High (fast, familiar) |
| Mobile experience | Good (native OAuth flows) | Poor (switch to email app) | Excellent (biometric) |
| Privacy concerns | Provider knows your activity | Minimal | Minimal |
| Offline support | No | No | Yes (device-based) |
| Browser support | Universal | Universal | ~85% (growing) |
| B2B suitability | Good (Google Workspace SSO) | Good | Growing |
| B2C suitability | Excellent | Moderate | Excellent |
Security Comparison
| Threat | OAuth | Magic Links | Passkeys |
|---|---|---|---|
| Credential stuffing | Immune | Immune | Immune |
| Phishing | Moderate risk | High risk | Immune |
| Man-in-the-middle | OAuth prevents | Vulnerable | Cryptographic protection |
| Account takeover | Provider-dependent | Email account compromise | Device theft required |
| Session hijacking | Standard session risks | Standard | Standard |
Implementation with Popular Services
| Provider | OAuth | Magic Links | Passkeys |
|---|---|---|---|
| Clerk | Yes | Yes | Yes |
| Auth0 | Yes | Yes | Yes |
| NextAuth.js | Yes | Yes | Via adapter |
| Supabase Auth | Yes | Yes | Coming |
| Firebase Auth | Yes | Yes | No |
Our Recommendation
We implement OAuth social login as the primary method (Google and GitHub cover most users), with magic links as a fallback for users who prefer email. For high-security applications, we add passkeys as an option. This layered approach maximizes conversion while maintaining strong security.
Implement secure authentication for your application.