7 Mobile App Design Rules to Follow
More than ever, people are using their phones. The very fact is that the overwhelming majority of that time is spent on applications and websites. Following these 7 fundamental rules of mobile app design, you will surely create a great application for users. Inkyy Web Design & Development Studio.
5 min read
These mobile app design rules are the ones we come back to on every project. Follow them and your app will be easier to learn, quicker to use and harder to delete.
People spend most of their phone time inside apps, and they expect them to load fast, make sense at once and feel good to use. Good UX is not decoration. It is part of the product itself. Below are seven rules, plus a checklist to run before launch.
Why mobile app design rules matter
Small screens leave no room for mistakes. Users are often on the move, using one hand and a patchy connection. If your app asks them to think too hard, they leave, and trying a competitor takes seconds.
Apps now sit alongside websites as a main channel between a business and its customers. They need the same care, and in some ways more, because the screen is smaller and the standards are higher. If you are starting a project, read our guide to the mobile app design and development process too.
7 rules to follow
1. Keep navigation simple
Users should find their way without instructions and complete the main tasks in a few taps. Choose a navigation pattern that fits the app. A bottom tab bar with three to five destinations is a common, easy choice on both iOS and Android, and it keeps the main sections within reach of a thumb.
Do not send people out of the app to finish a task. Give them everything they need in one place. Our post on website navigation covers principles that apply here too.
2. Prioritise content
Screen space is precious, so show only what is needed for the task at hand. If something does not help the user right now, move it, shorten it or remove it. Use size, weight and position to show what is most important, as explained in our guide to visual hierarchy.
3. Make text readable
A smaller screen does not mean smaller text. Use a comfortable size, keep a contrast ratio of at least 4.5 to 1 for body text, and choose a clear typeface. Support the text-size setting built into the phone, so people who need larger type can have it. Apple’s default body size is 17 points, which is a good reference point. Add personality in headings, not in long reading text.
4. Be consistent
Use the same colours, icons, spacing, wording and behaviour across every screen. Follow the platform too. iOS and Android users have learned how back buttons, switches and menus work on their own system, and breaking those habits makes an app feel wrong. The Apple Human Interface Guidelines and Material Design are the reference points.
5. Design good onboarding
Onboarding sets expectations for the whole app. Keep it short, show the value quickly and let people skip it. Teach by doing: highlight a feature when it is first needed instead of showing five screens up front. Ask for permissions such as notifications or location only when the reason is clear, because a request out of context is easy to refuse.
6. Use white space
White space is not wasted space. It separates groups, lets the content breathe and shows where to tap. On mobile it also protects accuracy. Make touch targets at least 44 by 44 points on iOS and 48 by 48 dp on Android, and leave gaps between them so thumbs do not hit the wrong thing.
7. Stay minimal
Minimal design is not about looking plain. It means every element has a job. Avoid heavy decoration and extra features, and rely on familiar icons and patterns so users can focus on the task. For a clean example, look at this minimal e-commerce template.
The rules in action
Take a simple food-ordering app. Navigation is a bottom bar with Menu, Orders and Account. The menu screen puts the dish photo and price first and hides nutrition details behind a tap. Text stays large and dark on a light background. Buttons look and behave the same on every screen, onboarding is two screens that can be skipped, and the checkout form has room around each field. Nothing on that list is clever. It is simply the rules applied with care, and that is usually what a good app looks like.
Speed, feedback and errors
Design is not only what the screen looks like. It is also how the app responds. Users should feel the app is fast, so load the most important content first and show a clear loading state for anything slower. A blank screen makes people think the app has frozen.
Give feedback for every action. A button should change when pressed, a saved item should show a short confirmation and a failed action should say what went wrong and what to do next. Write error messages in plain language instead of codes. Also think about the moments when the connection drops. Even a simple message such as “You are offline, your changes will be saved when you reconnect” is far better than a crash.
Check your design before launch
- Can a new user complete the main task without help?
- Does every screen have one clear purpose?
- Is text readable outdoors, at larger sizes and in dark mode?
- Are all touch targets large enough and spaced apart?
- Do icons, buttons and labels behave the same way everywhere?
- Does the app work on a slow connection and small screens?
Test early with real people. A clickable prototype built from a mobile UI kit or wireframes is enough to find most problems. When you see the opposite of these rules, our post on bad mobile app design shows what to avoid, and our mobile app design tips add more detail.
Frequently asked questions
What are the basic rules of mobile app design?
Keep navigation simple, prioritise content, make text readable, stay consistent, design a short onboarding, use white space and keep the interface minimal.
How big should buttons be in a mobile app?
Apple recommends touch targets of at least 44 by 44 points. Material Design uses 48 by 48 dp. Leave space between them to avoid mis-taps.
How many items should a bottom navigation bar have?
Between three and five. Fewer than three is not worth a bar, and more than five makes the labels and targets too small.
Should I follow iOS and Android guidelines?
Yes. Users know their platform’s patterns, so following the guidelines makes the app feel familiar and reduces learning time. Break a convention only when you have a clear reason.
Need a mobile app designed for a client?
Inkyy is a white label design and development team for agencies. Our designers and developers build mobile interfaces that follow platform rules and deliver them under your brand. See our design services, see development or book a 15-minute call.
