Flutter
A framework that builds native-quality iPhone and Android apps from a single codebase. You write it once and it runs on both - no two teams, no two timelines. It compiles to native code rather than running through a bridge, so it holds up under load and gives a genuinely consistent feel on both platforms out of the box.
Strengths
- one codebase, which halves the cost and keeps the experience identical on both platforms
- compiled native code, so there's no performance compromise
- amazing dev features such as hot reload, to speed up development and testing
- the option to expand to web and desktop later with the same code
The tool I start most new mobile apps with. One codebase, native performance, and a consistent experience on both platforms.
Example: A booking and management app used by staff and customers, shipped on iPhone and Android from one codebase.