Mobile vs web architecture

Mobile apps and web apps solve the same problems differently. Websites load fresh from servers each visit. Mobile apps live on phones, storing data locally and syncing when online. This core difference drives every architectural choice.

Mobile apps can work offline. For example, WhatsApp queues messages without internet, sending them when you reconnect. Websites need constant connection. But websites update instantly — fix a bug, everyone sees it immediately. Mobile apps require app store approval and user downloads, making certain types of fixes take days or weeks.

Mobile apps built specifically for iOS or Android (also called native apps) are fastest but need separate code for each platform. Web apps work everywhere but can't access phone features easily. Many companies start with responsive websites (websites that automatically adjust their layout and design to fit different screen sizes, like desktops, tablets, and phone), then build apps when they understand user needs better.