In the case of cross-platform/hybrid mobile app development, the same technological framework is used to develop the app for several platforms, with the idea being that this saves time by cutting out the complication and effort of developing an app separately for different platforms.
Key cross-platform technologies are Xamarin, React Native (by Meta) and Flutter (by Google).
We recommend and use Flutter technology. Google launched Flutter in 2018 and there was a very strong uptake and it has now become the most popular cross-platform, which offers great performance for small and medium complexity apps with a more competitive budget.
For more complex app, where there are complicated functional modules foreseen for the future, the native technology is still the better choice.