Part 3 of the Dart Frog series delivers a working full-stack Flutter and Dart Frog demo. The tutorial builds a Todo app, connecting a Flutter frontend to a local Dart Frog backend for complete CRUD operations, avoiding external services like Firebase.

Developers configure a CORS middleware in Dart Frog to handle cross-origin requests. The Flutter app uses Dio for HTTP calls and Riverpod for state management, specifically using AsyncNotifierProvider to handle API interactions and UI updates efficiently.

The project demonstrates a pure Dart stack, sharing a Todo model across client and server. This approach offers a unified development experience, simplifying data validation and serialization. The source code is available on GitHub, with future plans for authentication and deployment.