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AuthStack Docs

Introduction

AuthStack is a usage-based authentication platform designed to provide secure, scalable authentication without subscription fees.

What is AuthStack?

Section titled “What is AuthStack?”

AuthStack provides:

  • Social Login Providers - Google, GitHub, Microsoft, Apple, and Discord
  • OAuth 2.0 & OpenID Connect - Industry-standard authentication protocols
  • JWT Tokens - Secure access and refresh tokens
  • Usage-Based Pricing - Pay only for active users, 1,000 MAU free
  • Audit Trail - Track user activity across applications
  • Per-App Provider Control - Configure which providers each application can use
  • Centralized OAuth - AuthStack handles OAuth app configuration, no credentials needed
  • Provider Credentials - Access provider tokens (GitHub, Google, etc.) for API calls

Supported OAuth Providers

Section titled “Supported OAuth Providers”
ProviderAuthentication Method
GoogleID Token validation
GitHubOAuth code exchange
MicrosoftAzure AD / Personal accounts
AppleSign in with Apple
DiscordOAuth2 code exchange

Why AuthStack?

Section titled “Why AuthStack?”

Usage-Based Pricing

Section titled “Usage-Based Pricing”

No subscriptions, no tiers, no hidden fees. Pay only for what you use:

  • 1,000 MAU free every month
  • $0.005 per MAU above free tier
  • 10,000 API calls free, then $0.10 per 1,000

Centralized OAuth Configuration

Section titled “Centralized OAuth Configuration”

Configure OAuth credentials globally once, then enable specific providers per-application. This gives you:

  • Centralized credential management
  • Granular control over which apps use which providers
  • Easy onboarding for new applications
  • No OAuth credentials needed in your app - AuthStack handles it

Security First

Section titled “Security First”

Built with security best practices:

  • Password hashing with bcrypt
  • JWT with configurable expiration
  • Rate limiting and brute force protection
  • Secure token storage
  • Encrypted OAuth credentials at rest

Official SDKs

Section titled “Official SDKs”
PlatformPackageFeatures
Fluttervoo_authstack_clientFull SDK with auto-refresh, provider credentials
.NETAuthStack.ClientFull SDK with JWKS token validation

For other platforms, use the REST API directly.

Quick Example

Section titled “Quick Example”

Flutter

Section titled “Flutter”
import 'package:voo_authstack_client/voo_authstack_client.dart';


// Initialize
final authService = VooAuthstackService(
  config: VooAuthstackConfig(
    baseUrl: 'https://api.authstack.voostack.com',
  ),
);
await authService.initialize();


// Login with email
final result = await authService.loginWithEmail(
  email: 'user@example.com',
  password: 'password123',
);


// Or use centralized OAuth - no credentials needed!
final authUrl = await authService.getProviderAuthUrl(
  provider: OAuthProvider.github,
  redirectUri: 'https://yourapp.com/callback',
);
// Redirect user to authUrl.authorizationUrl


// Get provider credentials to call GitHub API
final credentials = await authService.getProviderCredentials(OAuthProvider.github);
// Use credentials.accessToken with GitHub API

.NET

Section titled “.NET”
using AuthStack.Client;


// Initialize
var client = new AuthStackClient(new AuthStackConfig
{
    BaseUrl = "https://api.authstack.voostack.com"
});
await client.InitializeAsync();


// Login with email
var result = await client.LoginAsync("user@example.com", "password123");


// Or use centralized OAuth
var authUrl = await client.GetProviderAuthUrlAsync(
    OAuthProvider.GitHub,
    "https://yourapp.com/callback"
);
// Redirect user to authUrl.AuthorizationUrl


// Get provider credentials to call GitHub API
var credentials = await client.GetProviderCredentialsAsync(OAuthProvider.GitHub);
// Use credentials.AccessToken with GitHub API

Next Steps

Section titled “Next Steps”