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The decision regarding the technology stack to be used in a chat app is of the developer and their flexibility in pricing for the entrepreneurs.
For android, the most common programming techniques that can be used is IDE, Java & Kotlin, or Flutter
For iOS, the most common programming techniques that can be used is Swift or Flutter.
The backend technology is the most important decision to be made as it will decide the overall performance of the app. The backend tech should be robust as mentioned below
Hope the technology stack for a chat app helps you in developing a high-performance chat app.