Tutorials

Learn how to use FAST-CLI with step-by-step tutorials

Building an Extension from Scratch

Learn how to create a complete MIT App Inventor extension from scratch using FAST-CLI

This comprehensive tutorial walks you through creating a simple button extension with custom properties, methods, and events.

Beginner25 min

Using Kotlin for Extensions

Leverage Kotlin's modern features to build powerful App Inventor extensions

Learn how to enable Kotlin support in your FAST-CLI project and use Kotlin language features to simplify your code.

Intermediate20 min

Working with External Libraries

Integrate third-party libraries into your App Inventor extensions

This tutorial shows how to add and use external Java/Kotlin libraries in your extensions using FAST-CLI's dependency management.

Intermediate15 min

Creating Helper Blocks

Enhance your extension with helper blocks for better user experience

Learn how to implement and use helper blocks in your extensions to provide dropdown options and improve the block-based UI.

Advanced30 min

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