total production, inc. can develop Progressive Web Apps (PWA). While you might not know what this is, or that you need it, let's discuss it.
If you like the idea of having an app but don't want to go through the expense of actually developing one, or the long wait to get an app approved, or the red tape you would need to go through to get it approved, the answer might be a PWA. With a PWA you bypass all that and can get a similar experience to an expensive app found in an app store.
Users can "install" it to their home screens and open it just like an app from their app stores.
There may be limitations on how much can be cached to a device. For instance, you might have a podcast type PWA but you may be limited on some devices as to how many can be downloaded to play offline.