Clearance

As a Rails engine, it can be added with a generator that sets up models, controllers, and migrations, reducing initial setup time and following Rails conventions.

All controllers, views, and routes can be subclassed or overridden, and the SignInGuard stack allows for extensible middleware, giving developers fine-grained control over authentication flows.

Includes RSpec and TestUnit helpers, backdoor middleware for fast integration tests, and generators for feature specs, making it easy to build and maintain test suites.

Provides opinionated, well-tested defaults for email/password authentication, session management, and routing constraints, while remaining easy to override via configuration.