It is free & open source and that's why is being used by corporates, individuals and startups.
3 key features of Flutter:
1. High velocity development
2. Expressive and flexible designs
3. High-quality experiences
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Thanks to the many new features across the framework and tools, teams across Google (such as AdWords) and around the world have been successful with Flutter.
Flutter has been used in production apps with millions of installs, apps built with Flutter have been featured in the App Store and Play Store (for example, Hamilton: The Musical), and startups and agencies have been successful with Flutter.