Single Sign-On (SSO) vs Passwords: Complete Comparison

You've probably seen the "Sign in with Google" or "Continue with Apple" buttons on websites. These use Single Sign-On (SSO)—and they're changing how we authenticate. But are they more secure than traditional passwords?

In this guide, we'll explore SSO, how it compares to passwords, and when you should use each.

What Is Single Sign-On (SSO)?

Single Sign-On lets you log into multiple apps and services using one identity provider—usually Google, Apple, Microsoft, or Facebook.

Instead of creating a new username and password for each service, you use credentials you already have. The identity provider confirms your identity to the service, and you're logged in.

How SSO Works (Simplified)

1. You click "Sign in with Google"
2. You're redirected to Google's login page
3. Google verifies your identity
4. Google tells the app, "Yes, this person is who they say they are"
5. The app logs you in without ever seeing your Google password

Your Google password never goes to the app. Only Google can verify your identity.

SSO vs Traditional Passwords: Key Differences

Advantages of Single Sign-On

1. Better Security Through Centralization

You only need to protect one strong password—your Google or Apple password. You don't have to manage dozens of passwords across hundreds of sites. Less password reuse = less risk.

2. Phishing Protection

With SSO, your password is only entered on Google, Apple, or Microsoft's domain. You can't accidentally enter your credentials on a fake website. The SSO flow goes through verified, secure redirects.

3. Easier Account Recovery

If you forget your credentials, account recovery is handled by your identity provider, not the individual app. This is often more reliable.

4. Added Security Features

Google, Apple, and Microsoft add 2FA, passkey support, and advanced security to their login flows automatically. You get their security infrastructure for free.

5. Faster Sign-Up

Instead of creating a new account with name, email, and password, you click one button and you're done.

Disadvantages of Single Sign-On

1. Single Point of Failure

If someone compromises your Google account, they have access to every app that uses Google SSO. Your Google password is now critically important.

2. Limited Availability

Not every app supports SSO. You'll still need traditional passwords for many services, which defeats the purpose of simplification.

3. Privacy Concerns

The identity provider (Google, Apple) knows which apps you use and can track your activity. This may not align with your privacy preferences.

4. Account Lockout Risk

If your identity provider account is locked or compromised, you can't access any linked apps. You're locked out everywhere simultaneously.

5. App Dependency

If Google goes down, you can't log into apps that only support SSO. You have no backup login method.

When to Use SSO

Use SSO for:

• Low-stakes apps: Productivity tools, reading apps, games, social apps
• Apps that support passkeys: If the identity provider uses passkey-based SSO
• Convenience over security: When you prioritize ease of use
• Multiple device access: SSO works seamlessly across devices

Avoid SSO for:

• Critical accounts: Email, banking, cryptocurrency (use a strong password + 2FA or passkeys)
• Privacy-sensitive services: Health apps, mental health platforms (use separate credentials)
• Apps you need independent access to: If your identity provider is compromised, you want alternative login methods

Best Practices for SSO

1. Protect Your Identity Provider Account

Use a strong, unique password for your Google/Apple/Microsoft account. Enable 2FA and security keys on your identity provider account—this protects every app that uses SSO.

2. Use Separate Passwords for Critical Services

Never use SSO for banking, email, or crypto. These need independent credentials and strong 2FA.

3. Review Permissions

When you sign in with SSO, the app asks for permissions to access your email, profile, etc. Only grant permissions necessary for the app to function.

4. Regularly Audit SSO Connections

Visit your Google/Apple/Microsoft account settings and review which apps have SSO access. Remove apps you no longer use.

5. Keep a Password Manager as Backup

Even with SSO, keep a password manager for services that don't support it or as a backup to your identity provider account.

The Future: SSO + Passkeys

The best of both worlds is combining SSO with passkey authentication. Use your Google, Apple, or Microsoft account with passkey-based login for maximum security and convenience.

Bottom Line

Single Sign-On is great for convenience, but don't use it for everything. Use SSO for low-stakes apps, and use strong passwords or passkeys for critical accounts. Your identity provider account is precious—protect it fiercely with a strong password, 2FA, and security keys.

Looking for a tool to generate and manage strong passwords for services that don't support SSO? Try StrongPass.