Golden Rules when design your app.
When designing a mobile app for public use, the most important points revolve around usability, accessibility, trust, and scalability.
- User-Centred Design (UCD)
Design for real users, not assumptions.
- Identify your target audience (age, tech ability, language, context)
- Keep flows simple and intuitive
- Minimize steps to complete key actions
- Use familiar patterns (bottom navigation, standard icons)
👉 Rule of thumb: if a first-time user needs instructions, the design is too complex.
- Simplicity & Clarity
Apps must work for everyone, including non-technical users.
- Clean layouts with plenty of white space
- Clear labels (avoid jargon)
- One primary action per screen
- Predictable navigation
❌ Avoid clutter ✅ Prioritise what matters most
- Accessibility
Accessibility is not optional.
- Large, readable fonts
- High contrast for text and buttons
- Include screen readers
- Don’t rely on color alone to convey meaning
- Touch targets at least 44×44 px
This ensures usability for:
- Elderly users
- Visually impaired users
- Users with motor challenges
- Performance & Reliability
Public users have little patience.
- Fast app startup
- Smooth scrolling
- Handle slow or unstable networks gracefully
- Provide loading indicators and error messages
If it crashes or freezes → users uninstall.
- Offline & Low-Bandwidth Considerations
Especially important in regions with unreliable connectivity.
- Cache essential data
- Allow limited offline functionality
- Sync data when connection returns
- Keep data usage low
- Privacy, Security & Trust
Public users must feel safe.
- Collect only necessary data
- Be transparent about data usage
- Secure authentication (biometrics, PIN, OTP)
- Encrypt sensitive data
- Follow local regulations (e.g., POPIA if applicable)
Trust = adoption.
- Clear Onboarding & Help
Explain value quickly.
- Short onboarding screens (3–5 max)
- Skip option
- Tooltips or contextual help
- Easy access to support or FAQs
Users should understand: What does this app do for me?
The Golden Principles
✔ Simple
✔ Accessible
✔ Fast
✔ Secure
✔ Reliable
✔ User-focused