Decision-Making Breakdown

Authentication: Clerk vs StackAuth

Clerk

Good for:

• Fully managed user authentication (SSO, OAuth, MFA, sessions)
• Built-in UI components (sign-in, profile, 2FA)
• Faster delivery with fewer security edge cases
• Social login support
• Strong documentation and SDK support for JavaScript and mobile

Pros:

• Quick integration with Next.js and mobile SDKs
• Handles token and session lifecycle
• Enterprise-ready features without extra infrastructure
• Reduces backend auth maintenance

Cons:

• Vendor lock-in
• Monthly cost at scale
• Less control over custom auth business logic

Best fit if: You want secure, low-maintenance auth quickly and expect social login/MFA without building everything in-house.

StackAuth (custom or self-hosted auth stack)

Good for:

• Full control over auth behavior
• No third-party auth service cost
• Local data residency control

Pros:

• No external auth dependency
• Full control of token/session storage
• Easier to audit bespoke auth flows

Cons:

• You build and maintain security logic
• Higher ongoing maintenance burden
• Harder to scale securely

Best fit if: Your team has strong security expertise and needs maximum control (for example strict compliance or bespoke auth requirements).

Rule of Thumb

Team recommendation: Clerk, because the stack includes integrated frontend and mobile, and reducing auth maintenance overhead is a strong priority.