A mobile app design agency for iOS and Android.
We're a mobile app design agency. We design iOS and Android experiences that respect platform conventions while staying unmistakably on-brand, from onboarding through the screens people open every day.
What's included
- Information architecture and user flows
- iOS and Android UI design, platform-aware
- Interaction and micro-animation specs
- Design QA through engineering handoff
What we don't do
- App engineering and coding
- Backend and API development
- App store accounts, fees and publishing
How we work
Discovery
We learn who the app is for, what they do in it, and what it has to achieve for your business.
Flows
We map user flows and navigation, starting with onboarding and the screens used every day.
Interface
We design iOS and Android screens that follow each platform's conventions and your brand.
Prototype
We build interactive prototypes and test them on real devices.
Handoff
We specify interactions and animations, hand off to your engineers, and check the build in design QA.
What it costs
Three ways to scope it, with a fixed price agreed before we start. Here is how each compares with what agencies typically quote.
Focused
Up to 15 screens on one platform.
- Mellon
- £5,400 – £13,500
- Typical agency
- £6,000 – £15,000
- Typical timeline
- 3–5 weeks
Request thisWhat you get Mellon Typical agency User flows and wireframes Included Included High-fidelity screens in Figma Included Included Clickable prototype Included Extra cost Developer-ready handoff Included Extra cost Revision rounds Two One MVP
15–25 screens for iOS and Android.
- Mellon
- £13,500 – £36,000
- Typical agency
- £15,000 – £40,000
- Typical timeline
- 6–10 weeks
Request thisWhat you get Mellon Typical agency User research and interviews Included Extra cost Platform-native patterns for iOS and Android Included Included Interactive prototype Included Included Usability test with five users Included Extra cost App store asset design Included Extra cost Weekly calls with the lead designer Included Fortnightly, via a project manager Full product
30+ screens, several user roles and a design system.
- Mellon
- £36,000 – £81,000
- Typical agency
- £40,000 – £90,000
- Typical timeline
- 3–5 months
Request thisWhat you get Mellon Typical agency Research and stakeholder workshops Included Included Design system, 100+ components Included Extra cost Accessibility review Included Extra cost Motion and gesture specs Included Not included Developer support during the build Included Extra cost 60 days of support after launch Included Not included
Prefer to pay by the hour or the month?
By the hour
Small jobs, fixes and work you cannot scope yet. Pay only for the hours used.
- Mellon
- £30 per hour
- Typical agency
- £75 – £150 per hour
- Senior designer, no juniors
- Billed in 30-minute steps
- Hours report every week
- Move to a fixed price if the scope settles
Monthly retainer
Best valueOngoing design work with hours reserved for you every month.
Quoted after a short call
- 40 hours reserved every month
- Weekly check-in call
- Priority turnaround on requests
- Unused hours roll over for one month
Prices are in GBP, before tax, and show the usual range for each scope. Agency figures are typical ranges from published 2026 pricing guides. Your quote depends on screens, pages and complexity.
Frequently asked questions
Do you design for both iOS and Android?
Yes. We design for each platform's conventions, so the app feels native on both while staying consistent with your brand.
Do you build the app too?
We design the app and hand off to your engineers, then check the build in design QA.
Can you redesign an existing app?
Yes. We find where users drop off, redesign those flows first, and keep what already works.
Do you design onboarding?
Yes. Onboarding is one of the first flows we design, because it decides whether people reach the screens they'll use every day.
What do we receive at the end?
High-fidelity screens, an interactive prototype, interaction and animation specs, and a component library in Figma.
How do you price mobile app design?
Clearly scoped work is a fixed project fee, and ongoing design is a monthly retainer. We scope it with you after a short call.