Cross platform development is usually presented as building once and shipping twice, and the accurate version is that you share most of the logic and interface while a real and unavoidable portion stays platform specific. The size of that portion is the whole decision, and it depends on what your app does rather than on which framework anyone prefers.
What cross platform app development services never share
Platform integration work stays native whatever framework you choose: notifications and their permission models, background execution rules, biometric authentication, in app purchase and subscription plumbing, widgets, deep linking, and anything touching hardware such as cameras or sensors in a non trivial way. Ask a bidder to estimate what proportion of your specific app falls into that category. A bidder that says everything is shared has not read the requirements.
When hiring a cross platform application development company is clearly right, and clearly wrong
It is right when you need both platforms, your interface is mostly standard forms, lists and navigation, and the real constraint is that a small team cannot maintain two codebases. It is wrong when the product's value depends on platform specific behaviour, demanding graphics or animation, or deep hardware use. The mistake is choosing on team preference rather than on what the app does, and it is very expensive to reverse once a codebase exists.
Store review does not become simpler
Whatever you build with, each platform reviews the result on its own terms. Apple's App Store Review Guidelines apply identically to a cross platform app, including in app account deletion when you offer account creation, permission justification, subscription disclosure and user generated content controls. Cross platform frameworks sometimes lag when a platform changes its requirements, so ask a bidder how quickly it has adopted platform changes in past projects.
Judge a cross platform mobile app development company on the boundary, not the framework
The useful question is not which framework a company prefers but how it decides what to write natively and how it structures the codebase so that native modules are clean rather than bolted on. Ask to see how a previous project handled a platform specific feature. A company with a clear, practised answer will deliver a maintainable app; one that treats native code as an exception to be avoided will produce something that fights the platform for years.
Questions people ask about cross platform app development company
How much code does a cross platform mobile application development company actually share?
Most business logic and most standard interface, with platform integration staying native: notifications, background execution, biometrics, purchases, widgets, deep linking and non-trivial hardware use. Ask a bidder to estimate that proportion for your specific app.
When should we go native instead?
When the product's value depends on platform specific behaviour, demanding graphics or animation, or deep hardware access. Choosing cross platform on team preference rather than on what the app does is expensive to reverse.
Do cross platform mobile development services make app review easier?
No. Each platform reviews the result on its own terms and the App Store Review Guidelines apply in full. Frameworks can also lag platform changes, so ask how quickly the company adopted them on past projects.