Even though Swift has greatly reduced the need for Objective-C, some older iOS apps may still use it. Maintaining legacy code may necessitate familiarity with Objective-C.
Google's Flutter is an open-source mobile app development framework that leverages the Dart programming language. Prompt updates, an adaptable user interface, and solid native performance are its calling cards.
Python can be used to make mobile apps, but it's not as popular as it used to be. Frameworks like Kivy and BeeWare make it possible. With these tools, Python can be used to make apps that work on multiple platforms.
RubyMotion is a toolchain that enables developers to build mobile applications for iOS and Android using Ruby as the underlying programming language. It is not very widespread, but Ruby devotees may find it to be an appealing option.