How to Build Your Own Auth0
Replace Auth0 with a custom build. Secure AI Agent & User Authentication
Build Difficulty: 4/5
A few focused days to build a solid replacement
Estimated Timeline
Based on 73 features at Few Days difficulty, expect about 3-5 days with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Key Features to Replicate
Top features across 8 categories. See all 73 features
Authentication(14 features)
Enable agent or app initiated user authentication via out-of-band notification channels
Enable single sign-on across multiple applications and services
Embed authentication directly into your application interface
Automatically route users to the correct identity provider based on their email domain
Support persistent sessions that last longer than standard session durations
+9 more in this category
Security(10 features)
Dynamic multi-factor authentication triggered only on suspicious login attempts
Keep users and services safe from password leaks, intruders, and scripted attacks with basic and enhanced protection
Detect and prevent automated bot attacks from accessing your application
Detect and protect users when credentials are leaked from external sources
Protect against repeated login attempts and brute force attacks
+5 more in this category
Compliance(8 features)
Financial-grade API (FAPI) certified for highly regulated environments
HIPAA compliance with Business Associate Agreement for healthcare applications
Retain authentication and authorization logs for auditing and compliance
Stream Auth0 audit logs to Datadog, Splunk, AWS, Azure, and other platforms
PCI compliant environments for payment card industry standards
+3 more in this category
User Management(8 features)
Link multiple user accounts together for unified user management
Use Auth0's built-in user database for authentication
Add custom metadata and attributes to user profiles
Receive user provisioning updates from external SCIM providers
Model and manage multiple customer organizations within your application
+3 more in this category
Administration(6 features)
Define granular admin roles (Admin, Viewer, Editor) with different permission levels
Comprehensive dashboard for managing Auth0 configuration and users
Enable single sign-on for the Auth0 dashboard itself
Allow customers to manage their own users and settings
Quick setup wizard for rapid Auth0 configuration
+1 more in this category
Customization(6 features)
Create and customize authentication forms without code
Customize the login experience with your brand colors, logos, and messaging
Configure every aspect of the login user interface
Use your own custom domain for authentication pages
Customize the entire signup and login process with APIs and Forms
+1 more in this category
Authorization(4 features)
Asynchronous authorization capabilities for complex workflows
Apply fine-grained authorization directly to RAG pipelines and enable user collaboration with granular access control
Define and enforce role-based permissions for users
Create and manage rules that control access to your app with allow, block, or redirect options
Infrastructure(4 features)
Dedicated private cloud deployment for data residency needs
High-performance private cloud deployment with 500 RPS and upgrade control
Maximum performance private cloud with 1,500 RPS and GEO-HA options
Dedicated Auth0 deployment for enhanced performance, security, and compliance
Cost Calculator
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Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 73 features at easy complexity.