App development
Building for phones brings its own constraints and opportunities. The big decisions — native versus cross-platform, architecture, and how you ship updates — shape everything that follows.
Native, cross-platform, or web?
There are three broad paths to a mobile experience, each with honest trade-offs:
- Native apps are written specifically for iOS or Android. They offer the deepest platform integration and the best performance, at the cost of maintaining two codebases.
- Cross-platform frameworks share most of the code across both platforms. They are efficient and increasingly capable, with occasional limits when you need very platform-specific behaviour.
- Progressive web apps run in the browser and can be installed to the home screen. They are the lightest option to ship and maintain, though they have less access to device features.
How a mobile app is structured
Well-built apps separate concerns clearly. A presentation layer handles the interface and user interactions. A domain layer holds the business logic. A data layer manages local storage, caching, and communication with back-end services. Keeping these layers distinct makes an app easier to test, change, and reason about as it grows.
Performance on a constrained device
Phones vary enormously in power and network quality. Smooth apps respect that reality: they keep the main thread free so the interface stays responsive, load data progressively, cache thoughtfully for offline use, and watch their memory and battery footprint. Small inefficiencies that are invisible on a desktop can be very noticeable in someone's hand on a patchy connection.
The release lifecycle
Shipping a mobile app is more involved than deploying a website. Builds are signed, submitted to the app stores, and reviewed before they reach users. A healthy process leans on:
- Automated builds and tests so every release is reproducible.
- Staged rollouts that release to a small percentage of users first.
- Crash reporting and analytics to catch problems quickly.
- A plan for users who do not update, since old versions linger.
Design that respects the platform
Each platform has its own conventions, and following them makes an app feel native rather than ported. Beyond that, the universal goals hold: clear navigation, touch targets that are easy to hit, fast feedback to every action, and an interface that remains usable one-handed and in bright sunlight.