Expo is described as 'free and complete workflow for creating next-generation apps for iOS and Android' and is an app in the Development category. There are more than 25 alternatives to Expo for a variety of platforms, including Online / Web-based, Android, iPhone, Mac and iPad. The best alternative is Android Studio, which is both free and Open Source. Other great apps like Expo are Bubble (Freemium), Thunkable (Freemium), MIT App Inventor (Free, Open Source) and Flipabit (Free Personal).
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