Swagger + OpenAPI generates data classes for you, and maybe a Retrofit/Ktor/Whatever interface. It does not handle repositories, data fetching, caching and combining, it does not handle a SQLite database.

Which dependencies ? If you already have Android devs, on the iOS side it adds a single swift package, and similarly so on Android.

  > It does not handle repositories, data fetching, caching and combining, it does not handle a SQLite database.

right, but you can use that to autogenerate all those things (have done it before in very large e-commerce app for several platforms/apps) with a few additional tools and have it all automated (especially useful when api definitions change because now you dont need to manually update everything by hand)

  > Which dependencies ? If you already have Android devs, on the iOS side it adds a single swift package, and similarly so on Android.

for ios, its including basically the whole kotlin runtime and additional support (kotlinx-datetime, etc) in that single package (xcframework), then add a lot of data classes and things start to add up... for us its the biggest single dependency by far