Back to Tools
Updated May 2, 2026Auth Comparison

FusionAuth vs NextAuth.js Comparison

A detailed comparison of FusionAuth and NextAuth.js.

F

FusionAuth

Auth for any app.

Primary Task

Self-hostable Auth

Pricing

Freemium

Key Features

  • Self-hostable
  • Multi-tenancy
  • Compliant
Visit Website
N

NextAuth.js

Authentication for Next.js.

Primary Task

Next.js Auth

Pricing

Open Source

Key Features

  • OAuth
  • Email/Passwordless
  • Own your data
Visit Website

At a Glance

FeatureFusionAuthNextAuth.js
Primary TaskSelf-hostable AuthNext.js Auth
Pricing ModelFreemiumOpen Source
Founded20182016
User LimitsN/AN/A
B2B/B2C FocusN/AN/A
MFAN/AN/A
Social LoginN/AN/A
SDK SupportN/AN/A

Pros & Cons

F

FusionAuth

Strengths

  • Self-hostable
  • No user limits on free tier
  • Feature-rich

Limitations

  • UI feels dated
  • Complex setup
  • Java-based (resource heavy)
N

NextAuth.js

Strengths

  • Open Source
  • Own your data
  • Deep Next.js integration

Limitations

  • Maintenance burden
  • Database adapter complexity
  • Less 'batteries included'
Final Decision

The Verdict

Both tools are excellent. Here's how to choose the right one for your project.

F

Choose FusionAuth

Best for

  • Strong Self-hostable capabilities
  • Freemium pricing model
  • Self-hostable Auth workflows
N

Choose NextAuth.js

Best for

  • OAuth focused projects
  • Open Source approach
  • Next.js Auth use cases

Frequently Asked Questions

What is the main difference between FusionAuth and NextAuth.js?

FusionAuth is primarily a Self-hostable Auth, while NextAuth.js is focused on Next.js Auth. Auth for any app. Authentication for Next.js.

Is FusionAuth open source?

No, FusionAuth is a commercial product with a freemium model.

Is NextAuth.js open source?

Yes, NextAuth.js is open source.

Which is better for Auth?

It depends on your specific needs. FusionAuth is often chosen for its self-hostable capabilities, while NextAuth.js is popular for its oauth features.