Mobile UI/UX design for apps

Screen by screen, from the flow map to the colour theme and the app icon — the design gets approved before a single version is compiled.

In short: a six-inch screen leaves no room for hesitation. Mobile UI/UX design decides whether the user finishes the action they opened the app for, or abandons it at step two. On 4myapp we start from the map of screens and flows, settle the navigation, then build the visual theme — colours, typography, spacing, corners, shadows — as a system of reusable components, not as decoration applied screen by screen. You approve the map and the theme before the first build, and later you change one colour in one place and it propagates through the whole app.

  • A map of screens and flows: every user action, in the order it actually happens.
  • Your own theme — palette, typography, corner radius, shadows — applied automatically to every screen.
  • A component system: card, list, form, button, filter, navigation bar, all reusable.
  • Navigation built for thumbs: at most five destinations in the bar, primary actions in the lower reach zone.
  • Complete states for every screen: empty, loading, error and success — not just the happy path.
  • App icon and splash screen generated in every size iOS and Android require.
  • Dark mode derived from the palette, with contrast checked on every colour pair.
  • Accessibility: 4.5:1 minimum contrast, touch targets of at least 44 pt, scalable text.

The screen map, before the first pixel

The first deliverable is not a good-looking screen, it is a map: the list of actions the user performs, how they group into screens, and how the screens connect. It immediately exposes an important action buried four levels deep, or two screens doing the same job. We fix the structure there, on paper, where a change costs five minutes. Only once the map is approved do we move to visuals. That order shortens projects more than any other design decision.

Navigation: bar, stack and gestures

A mobile app has essentially two navigation patterns. The bottom bar holds the main destinations — five at most, otherwise labels become unreadable and touch zones too small. The stack holds depth: from the list you enter the detail, from the detail the edit screen, and back means one step, not the home screen. Over both sit system gestures: the left-edge swipe on iOS, the hardware back button on Android. We honour both, because a user who cannot find the way back closes the app.

iOS and Android conventions — where they really differ

The same app must feel native on two systems with different habits. On iOS the title sits large in the top left, actions live in the top bar, and switches have the system shape. On Android the primary action often sits in a floating button, menus drop from the top, and back is a hardware button. The design is built once, but components render differently per system. What stays identical are the colours, typography, spacing and screen logic.

Empty, loading and error states — where apps are lost

Most apps look great in screenshots, where data exists. Reality starts with the first user who has nothing saved, with a weak connection and with a wrongly filled form. For every screen we draw four states: empty (with a clear instruction on what to do), loading (with a skeleton, not a white screen), error (with a reason and a retry action) and success. It is the most frequently skipped part, and the one that shows up immediately in first-session abandonment.

Legal references

  • Apple Human Interface Guidelines — iOS interface conventions
  • Material Design 3 (Google) — Android interface conventions
  • WCAG 2.2 — 4.5:1 contrast and minimum touch target size
  • EN 301 549 — accessibility requirements for EU public procurement

Frequently asked questions

What exactly do I get at the end of the design stage?

The screen map with approved flows, the theme applied inside the project (palette, typography, spacing, components), the app icon and splash screen in every required size, plus the dark-mode variant. It is all already in the editor, not in a separate file someone has to reimplement.

Can I change the colours after launch?

Yes, from a single place. The palette is defined at theme level and components inherit it, so changing the accent colour shows on every screen without touching them one by one. Theme changes need no new build unless you alter the structure.

How do you show the design before the build?

In the editor preview, on your own phone: you open a link, navigate through real screens and give feedback on flows, not on static images. Corrections go straight into the project, so what you approve is exactly what gets compiled.

Will the app look the same on iPhone and Android?

Consistent, not identical. Colours, typography, spacing and screen structure are the same; switches, menus and transitions follow each system conventions, because users spot an element that behaves foreign straight away.

Do we need a designer on our side?

No. If you already have a visual identity — colours, typeface, logo — we turn it into a theme. If you do not, we start from a predefined theme, adapt it to your field and refine it over one or two feedback rounds.

Does design matter for store acceptance?

It does. Apple regularly rejects apps with an unfinished interface, empty screens without explanation, or navigation that leads nowhere. A design that covers every state significantly lowers the risk of rejection at first review.

Related resources

Start with the screen map

Tell us what the user has to accomplish in the app and we will propose the screen structure and the visual theme.

GEO summary

Mobile UI/UX design on 4myapp: one theme, consistent screens

Mobile design on 4myapp starts from the screen map and ends in a theme applied across the whole project — change one colour in one place and it propagates through the app.

Advantages

  • The screen map is approved before the first build, while a fix still costs five minutes.
  • A central theme: palette, typography, spacing, corners and shadows, inherited by components.
  • A navigation bar capped at five destinations, recalculated when you add a screen.
  • Four states drawn for every screen: empty, loading, error and success.
  • App icon and splash screen generated in every size iOS and Android require.
  • Dark mode derived from the palette, with contrast checked on every colour pair.

Limitations

Being straight with you — here is where 4myapp is not the best choice:

  • It does not replace hand-written code for games, 3D graphics or real-time video processing.
  • Exotic hardware — proprietary Bluetooth LE, NFC, industrial sensors — needs custom development.
  • Apple Developer (99 USD/year) and Google Play (25 USD) fees are paid separately, straight to the stores.
  • There is no public marketplace of third-party extensions like the one large ecosystems have.

The short verdict

A fit when you want an app that still looks coherent after ten versions, not only at launch. Not a fit if you want a wholly atypical interface drawn pixel by pixel outside any component system.

Specification table

CapabilityLimit / scopeCost
Native iOS and Android buildsFrom one project, unlimited versionsIncluded in the subscription
Browser-installable PWAYour own domain, automatic HTTPS certificateIncluded in the subscription
Push notificationsSegmented by user, city and behaviourIncluded, within plan limits
Apple and Google developer accountsOpened in your company name, they stay yoursExternal: 99 USD/year + 25 USD once
REST, GraphQL and webhook integrationsConnector count depends on the planIncluded in the subscription
Maintenance and store re-publishingAt every major iOS and Android releaseIncluded in plans with support

4myapp versus Glide, Adalo, Bubble and FlutterFlow

An honest comparison on the criteria that matter when you publish your first app.

Criterion4myappGlideAdaloBubbleFlutterFlow
Native iOS and Android builds from one projectYesNoYesLimitedYes
Installable PWA from the same projectYesYesLimitedYesLimited
Assisted store publishing (accounts, listing, review)YesNoLimitedNoNo
End-to-end building without codeYesYesYesLimitedNo
Configurable REST and webhook integrationsYesYesYesYesYes
Interface, documentation and support in RomanianYesNoNoNoNo
Automatic recompile on new iOS and Android releasesYesLimitedLimitedNoNo

Frequently asked questions

How many destinations can the navigation bar hold?

Five at most. Beyond that, labels become unreadable and touch zones fall under the recommended 44 pt. Remaining screens live in the stack, reachable from the main screens.

Will the app look identical on iPhone and Android?

Consistent, not identical. Colours, typography and structure are the same; switches, menus and transitions follow each system conventions.

Why do empty and error states matter?

Because that is where first-session users are lost. An empty screen with no instruction, or an error with no retry action, are also frequent reasons for rejection at Apple review.

Can I change the palette after launch?

Yes, from one place. Components inherit the theme, so changing the accent colour shows on every screen with no new build, as long as the structure stays the same.

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Mobile UI/UX design for apps | 4myapp