Stop Building Auth. Start Building Features.
You're a developer with multiple projects, side hustles, and brilliant ideas. Don't let authentication roadblocks slow you down. Get robust, production-ready auth in minutes, not months.
The Problem Every Developer Faces
You know this story. You've lived it.
Time Investment
Each new project requires rebuilding the same authentication system. User registration, password resets, email verification, OAuth integration—typically 2-3 weeks before you can focus on your core features.
Development Bottleneck
Good ideas deserve quick validation. Complex authentication setup can delay testing your concept with real users, slowing down the iterative process that leads to successful products.
Security Complexity
Implementing secure authentication involves many considerations: proper password hashing, session management, OAuth flows, and compliance requirements. Getting it right requires significant expertise and ongoing maintenance.
Signin.fast: Your Authentication Safety Net
Like hosted federated login and SSO, but simpler
🚀 For Multi-Project Developers
- Reuse authentication across multiple projects
- Test with real authentication during development
- Spend time on your product features, not infrastructure
- Complete API access to your user data and analytics
⚡ Zero to Auth in Minutes
# Add this to your site:
<a href="https://signin.fast/@your-domain">
Login or Sign Up
</a>
# Handle the callback:
def callback
user_data = verify_token(params[:token])
# You're done!
endThat's it. No gems, no migrations, no configuration files.
Perfect for Every Stage
Idea Stage
Test your concept with real users in minutes. No auth setup blocking your creativity.
Development
Full-featured authentication that works on localhost. Test OAuth, password resets, everything.
Production
Scale to thousands of users with enterprise-grade security. Same simple integration.
Migration
Ready to build your own auth? Our robust API gives you complete access to all your data. Export users, sessions, password hashes - everything. Zero lock-in guaranteed.
Multiple Sites, One Auth System
Like having your own mini-Auth0, but without the complexity
Your Auth Dashboard
my-startup.com
1,247 users
side-project.dev
23 users
weekend-hack.io
156 users
Manage authentication for all your projects from one place. Each site gets its own user base and settings. Our comprehensive API gives you programmatic access to all your data.
What Developers Say
"I shipped 3 side projects last month because I didn't have to build auth for any of them. Signin.fast saved me weeks."
"Perfect for validating startup ideas. I can have a working MVP with real user auth in hours, not weeks."
"The fact that it works in development mode is a game-changer. No more localhost OAuth callback nightmares."
Focus on What Makes Your Project Unique
Join developers who spend their time building features, not authentication systems.
No credit card required • Export your data anytime • Zero lock-in