Coding 1: Choose Your App Builder

Choose your App Builder

Coding 1

In this lesson, you will…

  • Learn about different app builders and programming languages
  • Get set up with the tool you will use to program your App

Key Terms

  • App Builder -  programs that usually have a drag and drop interface that let you build apps without typing code 
  • Programming Language  - a way to talk to a computer, or mobile phone, to tell it to do things

App Builders and Programming Languages

Are you ready to become a computer programmer and code your very own apps? Before you start, you will need to decide what you will use to code your app.

This lesson will introduce you to app builders and programming languages that are commonly used by Technovation Girls students. The Technovation Girls curriculum has example code for both App Inventor and Thunkable, but you can submit in any of these languages: Thunkable or Thunkable Classic, App Inventor, Swift, or Java.  If this is your first time ever coding, the Technovation Girls team recommends you try using App Inventor or Thunkable. 

Look up any words in this lesson that you don’t recognize. When programmers don’t know what something means, they look it up! As a new programmer, it is good to ask questions and get familiar with some of the words that computer programmers use.

App Builders

App Builders usually have a drag and drop interface that let you build apps without typing code. Even though the code looks simple in app builders, you will still be learning valuable coding concepts. Here are two app builders that are supported in the Technovation Girls curriculum.

App Inventor


Android x x
iOS x
Cross platform x
Open Source* x
Free x x**
Available in many languages other than English x
Gallery with example projects x x
Real Time Testing x x

* Open source means that all the code used to create the app builder is free and open to use on the web. This may be important to you if you are concerned about losing your work if an app builder stops being supported or goes out of business. It may also be important to you if you want to find a work around to use an app builder offline.

** Thunkable allows account creation for free. Thunkable also provides a paid subscription service that will allow you to create private apps. Free accounts create publicly viewable apps that any other user can download and tinker with. Other users downloading your code will not affect the code in your own account.


Other programming languages you can use for your submission

Programming languages give you a way to talk to a computer to tell it to do things. There are lots of programming languages that you can use to build apps (besides App Inventor and Thunkable). Below, you can learn more about the other languages you can use to prepare your  Technovation Girls submission.

Programming Language Used to create apps for You will also need
Java Android Android Studio

Android Studio is the program you will use to create and test your Java code

Swift iOS XCode

XCode is the the program you will use to create and test your Swift code


What you need to participate in Technovation Girls:

  • Computer
  • Internet access
  • Gmail account
    • You need a Gmail account to log into App Inventor or Thunkable. To set up a gmail account go here.
  • A mobile device is optional but highly recommended. You can use an Android phone or tablet (App Inventor & Thunkable), or an iPhone or iPad (Thunkable only)


It is time to get everything set up so that you can start coding your own apps! The next two activities have instructions about how to get set up using App Inventor or Thunkable. You only need to do one of these activities, so you should decide if you want to use App Inventor or if you want to use Thunkable. It may help to discuss with your mentor which is better for your team.

If you are not using App Inventor or Thunkable, you should use this time to get set up and familiar with your app builder or programming language.

Activity: App Inventor Set Up

Follow along if you are using App Inventor

Part 1: Sign in

  1. Go to and click “create apps”.
  2. Log in with your gmail account. If you don’t have one, you should make one now.
  3. Once you are in, take a minute to explore. The next few steps will walk you through setting up your android phone or emulator for live testing.


Part 2: Connecting your Android phone or emulator

You can connect an Android phone or an emulator to test the app you built in App Inventor in three ways. All three methods allow you to do live testing, which means you can edit your app in App Inventor on your computer, and see those changes appear instantly on your phone or emulator.  

WiFi Method
  1. This is the easiest way to use App Inventor and is highly recommended by the Technovation Girls team.
  2. Choose this method if you have an Android phone or tablet and access to WiFi
  3. You need to be able to connect your computer and your phone to the same WiFi network in order for this method to work. 

With the WiFi method, you will build apps on your computer and test them on your phone using the App Inventor Companion App, called MIT AI2 Companion. View MIT’s instructions on how to get connected using WiFi.

Wifi Method Troubleshooting Tips:
  1. Make sure your computer and your phone are on the same WiFi network.
  2. Check that you downloaded the correct MIT AI2 Companion app onto your phone here: AI Companion App.
  3. Reset your connection to App Inventor if you encountered an error.
  4. If you’re still stuck here’s a video that may help:  PhilsComputerLab: Connecting with Wi-Fi.
USB Method
Emulator Method

Activity: Thunkable Set up

Thunkable is cross-platform app builder, which means that any app you build on Thunkable will work for both Android and iOS devices.

Here’s a video to help you get started setting up Thunkable.

First, create an account at Once you've finished that, let's go over how to set up your device:

Step 1

Click on the "Start Building" button.

Step 2
Step 3
Step 4


At the point you should have choose your app builder or programming language and have your computer set up so that you can start learning how to code apps!

  • Which App builder or programming language are you using? Why did you choose this one?

Additional Resources: Most Popular App Builder 

Here is more information about what types of app builders and programming languages Technovation Girls participants use. Please keep in mind that a majority of the semi-finalists and finalist at World Pitch use App Inventor and teams are not awarded extra points based on what they use to develop their app.

Programing Languages Popularity
App Inventor 52.66%
Thunkable 34.98%
Java or Android Studio 9.14%
Swift or XCode 3.22%

Sneak Peek!

Here are two videos from the MIT App Inventor team that walks through how to choose a problem, brainstorm a design, and code an app - exactly what you'll end up learning in Technovation Girls! Don't worry if you don't understand the whole process yet, this is just a preview of things to come.