The Mobile App Design Process, and What to Look for in a Mobile App Design Agency

The short answer

A good mobile app design process moves from goals to user flows, wireframes, a tested prototype, visual design and a design system, then a clean handoff to developers and support through beta. When you hire a mobile app design agency, look for apps it has actually shipped, work that shows flows and not just pretty screens, comfort with both iOS and Android conventions, and a handoff your developers can build from without guessing.

The mobile app design process, step by step

1. Goals and discovery

Agree what the app is for, who uses it and what success looks like: sign-ups, orders, daily use or retention. List the constraints early: platforms, tech stack, launch date and what already exists. A short round of user interviews or a review of support tickets often changes the plan more than any workshop.

2. User flows and information architecture

Map the journeys before drawing screens. Sign-up, the core task, payments, settings, notifications and what happens when something goes wrong. Decide the navigation model: tab bar, single feed, or hub and spoke. Most problems found later in an app trace back to a flow nobody mapped.

3. Wireframes

Low-detail layouts for every screen in the main flows. They are quick to change, so this is the stage to argue about content and order, not colours.

4. Prototype and test

Link the wireframes or early designs into a clickable prototype and put it in front of five or so real users. Watch where they hesitate. Fixing a flow here takes hours; fixing it after development takes weeks.

5. Visual design and design system

Typography, colour, iconography, components and states, in light and dark mode if you support both. Build it as a system, not a set of screens, so new features can be designed quickly and look consistent.

6. Platform and accessibility checks

Respect each platform's conventions. Apple's Human Interface Guidelines give 44x44 points as the default control size on iOS. Google's Android accessibility guidance recommends touch targets of at least 48dp. WCAG asks for a text contrast ratio of at least 4.5:1, or 3:1 for large text. Check these before handoff, not after a review flags them.

7. Handoff

Developers need more than screens. A good handoff includes every state (empty, loading, error, success), edge cases such as long names and slow connections, spacing and type tokens, exported assets and motion specs. Figma describes its Dev Mode as a developer-focused workspace for inspecting designs, which helps, but a walkthrough call is still worth it.

8. Build support and beta

The design team should stay involved while the app is built: answering questions, reviewing builds and fixing gaps. Apple's TestFlight lets you invite up to 10,000 external testers to a beta, which is a good way to catch problems before launch.

9. Launch assets

App Store screenshots, app preview videos, the website and launch motion. On the App Store, each app preview can be up to 30 seconds, with up to three per language. Plan these with the brand so the launch looks like one company.

What to look for in a mobile app design agency

• Shipped apps. Ask for apps you can download, not just concept shots. Ask what changed between design and release.
• Flows, not just screens. A strong case study shows journeys, wireframes and decisions, not only polished mock-ups.
• Design systems. Look for component libraries and documented states. This decides how fast you can ship after the agency leaves.
• Platform knowledge. They should know where iOS and Android differ and when to follow each.
• Handoff quality. Ask to see a real handoff file. Ask how they work with your developers during the build.
• Testing. Ask how they test prototypes and with whom.
• Brand and product together. If you also need a brand, website or launch film, one team keeps it consistent.
• Clear scope. Which flows, which platforms, how many revision rounds and what happens after launch.

Questions to ask before you sign

1. Which of your apps are live, and what did you own on each?
2. Who on your team will work on our project day to day?
3. How do you handle feedback from founders, developers and users at once?
4. What does your handoff include, and do you support the build?
5. Will we own all design files and the design system?

Real examples from our work

For Rippl, a creator commerce app, we designed the brand, the iOS app, the website and the motion, so the product and the launch felt like one thing. For Arva Health, an at-home fertility platform, we designed the app and a dashboard alongside a website built in Framer. Both needed one visual system across very different screens. You can see how we approach this on our Website, Product & App Design page.

A simple checklist before handoff

• Every main flow mapped and prototyped
• Prototype tested with real users, and fixes made
• Components and tokens documented in a design system
• Empty, loading, error and success states for every screen
• Light and dark mode checked, if supported
• Touch targets and contrast checked against platform and WCAG guidance
• Assets exported and motion specs written
• Walkthrough call held with the development team

FAQ

How long does mobile app design take?

It depends on the number of flows and platforms. A focused first version with a few core flows is much faster than a full product with payments, chat and settings. Ask any agency for a timeline per stage, not just a total.

Should we design for iOS and Android at the same time?

Usually, yes, with one shared design system and platform-specific details where conventions differ. If you launch on one platform first, design the system so the second is quick to add.

Agency, freelancer or in-house designer?

An agency suits a defined project with a deadline and several skills needed at once. A full-time designer suits continuous product work. Our guide to agency vs freelancer vs in-house goes deeper.

Where can we compare agencies?

Start with our lists of product design agencies for startups and UI/UX design agencies for startups.

Planning an app? Walk us through the core flow you want to get right, and we'll show you how we'd approach it.