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Just to confirm the terminology commonly used in mobile app development:

* Native apps - Written in compiled languages compatible with the target platform, uses platform-specific APIs.
* Hybrid apps - A "native" framework that loads web pages in a WebView (even if they are served from device storage) and has access to platform-specific APIs if the framework supports them.
* Progressive Web Apps - Written exclusively for the web, a PWA may only use web APIs. Platforms may allow users to add PWAs to app select screens, specify an image to use for a splash screen while loading, use the PWA offline, and hide the address bar to mock a fully-native experience.

With that out of the way, Drupal lists a few resources to [get started with mobile development](https://www.drupal.org/docs/mobile-guide/native-mobile-application-development) in their documentation. Unfortunately it's quite outdated, as PhoneGap has been discontinued and all the other resources show their age.

The sections headed **Native apps for iPhone...** and **Native apps for Android** appear to only include examples using Drupal as a RESTful API, so you are creating a whole app UX/UI from scratch on each platform, not with Drupal.

The section titled **Native apps with Titanium** is different, because Titanium is a Javascript framework that compiles to both iOS/Android target platforms. Provided the Drupal for Titanium module is up to date with today's devices, that would be considered native by most people.

Though PhoneGap doesn't exist anymore, [Apache Cordova](https://cordova.apache.org/) lives on as a hybrid app framework and is a good first start for someone not yet comfortable with native frameworks. It is compatible with Drupal or any other CMS.

Finally, here's info on [Drupal PWAs](https://www.drupal.org/project/pwa).