Mobile app design & development

Apps people open daily,
trust deeply and recommend.

Native iOS, native Android and cross-platform apps from a UK studio. Research-led UX, store-ready engineering, ASO and offline-first sync, under one roof.

Swift · Kotlin · React Native · Flutter
WCAG 2.2 AA · VoiceOver · TalkBack
App Store + Play submission included
Shipping mobile apps for 200+ founders, retailers and field-service teams
◇ MCM SoilsLowry Estates◯ WoodvaleAvon · Ruby△ Harbour HostsKingfisher Co.◈ NorthStarbramley & ivy◇ MCM SoilsLowry Estates◯ WoodvaleAvon · Ruby△ Harbour HostsKingfisher Co.◈ NorthStarbramley & ivy
What we do

End-to-end mobile app design & development.

Strategy, UX, UI, native and cross-platform engineering, store submission and ongoing growth, coordinated by one team.

Native iOS apps

Swift, SwiftUI and UIKit. Full App Store life-cycle: provisioning, TestFlight beta, in-app purchases, push notifications, App Clips and Widgets.

Native Android apps

Kotlin, Jetpack Compose and Material You. Google Play release pipelines, dynamic delivery, in-app purchases and Firebase Cloud Messaging.

Cross-platform (RN & Flutter)

React Native + Expo and Flutter. One codebase, two stores, when speed-to-market matters more than every native API. We'll tell you when it doesn't.

Mobile UX strategy

Platform-aware information architecture, gesture design, navigation patterns and task flows that respect Apple HIG and Material Design.

Mobile UI design

Pixel-perfect Figma designs for iOS and Android. Light and dark mode, adaptive layouts, dynamic type, large-text accessibility and motion.

Prototyping & user testing

Clickable Figma and ProtoPie prototypes on real devices. Validate flows with users before a line of native code is written.

Onboarding & activation

Sign-up, permissions, first-run flows and empty states. Get users to the aha-moment fast, and out of the App Store reject pile.

Push & deep linking

APNs, FCM, OneSignal, Customer.io. Deep links and Universal Links / App Links, so notifications open on the right screen, not the home tab.

App Store Optimization (ASO)

Title, subtitle, keywords, screenshots, video previews and review strategy. We measure organic installs and iterate quarterly with Sensor Tower data.

Offline-first & sync

Local databases (Realm, SQLite, WatermelonDB), conflict-resilient sync, queued writes and sensible offline UX. Apps that work on the Tube.

Backend & APIs

Firebase, Supabase, Node.js, GraphQL. Auth, real-time data, file storage, payments (Stripe, Apple Pay, Google Pay), wired up properly.

Performance & accessibility

60 fps scroll, low launch time, sensible battery and data use. VoiceOver, TalkBack, dynamic type and contrast, tested on real assistive tech.

Tech & platforms

Native, cross-platform, whatever the product needs.

We pick the stack based on your product, not the framework you read about last week.

Native iOS
SwiftSwiftUIUIKitXcodeTestFlightCombine
Native Android
KotlinJetpack ComposeMaterial YouAndroid StudioCoroutines
Cross-platform
React NativeExpoFlutterDartCapacitor
Backend & data
FirebaseSupabaseNode.jsGraphQLRealmSQLiteStripe
Analytics & ASO
MixpanelAmplitudeFirebase AnalyticsSensor TowerAppFollow
How we work

From kick-off to App Store, in 10 to 14 weeks.

Step01

Discover

  • User research & competitor audit
  • iOS / Android / cross-platform decision
  • Scope, KPIs & store strategy
Step02

Design

  • UX flows & wireframes
  • Hi-fi Figma UI (HIG / Material)
  • Prototype & user-test on device
Step03

Build

  • Native or cross-platform sprint
  • API integration & data sync
  • CI / CD on Bitrise / Fastlane
Step04

Test

  • TestFlight & Play Internal Testing
  • Device matrix & accessibility QA
  • Performance & crash analytics
Step05

Ship & grow

  • App Store + Google Play launch
  • ASO, reviews & monitoring
  • Quarterly roadmap & growth tests
Every project includes

From discovery to App Store live, covered.

Why HAPA Cloud

A studio that ships to both stores.

01
Native or cross-platform, your call

We've shipped Swift, Kotlin, React Native and Flutter. We'll recommend honestly based on your product, not our preference. Sometimes the right answer is “not yet”.

02
Designed for retention, not just install

Onboarding, push notifications, deep linking, lifecycle nudges, designed to bring users back, not just to ship a screen and pray.

03
Store submission is part of the job

Provisioning, screenshots, copy, age ratings, privacy declarations and review-rejection handling. We submit so you don't have to learn App Connect.

04
You own everything

Code, designs, developer accounts, analytics, all yours from day one. No SDK that holds your app hostage.

Apps we've shipped

Different audiences, same shipping discipline.

Hosts, plumbers, retailers, fintech founders, healthcare providers and field-service teams have all trusted us with their App Store presence.

Hospitality & Short-stayTrades & Field ServiceRetail & E-commerceHealthcare & WellbeingFinTechPropTechLogistics & DeliveryTravel & BookingEducationMedia & StreamingSports & FitnessInternal tools
0+
Apps shipped
0%
Avg. day-1 retention
0.8★
Avg. store rating
0wks
Typical first ship
Frequently asked questions

Answers, before you ask.

Should we build native iOS / Android, or cross-platform?

It depends on the product. Native (Swift / Kotlin) wins on performance, latest-platform features and graphics-heavy UX. React Native and Flutter shine when you need to ship to both stores fast with one team. We help you decide in discovery, and we've shipped both successfully many times.

How long does a mobile app take to design and build?

An MVP typically takes 10 to 14 weeks from kick-off to first store submission, depending on scope and integrations. We share a fixed timeline after the discovery workshop and ship to TestFlight / Play Internal Testing every two weeks so there are no surprises.

How much does a mobile app cost?

Bespoke MVPs typically range from £35,000 to £120,000 depending on platform choice (one or both), feature scope, integrations and offline complexity. Every quote is fixed, itemised and includes design, build, store submission and a launch retainer.

Do you handle App Store and Google Play submission?

Yes, including provisioning, signing, store listing copy, screenshots, video previews, age ratings, privacy declarations, and review-rejection handling. We submit under your developer accounts so the apps are yours from day one.

Can the app work offline?

Yes. We design offline-first when it matters: local databases (Realm, SQLite, WatermelonDB), queued writes, conflict resolution and clear sync UX. Field-service apps and travel apps especially benefit from this.

Will the app be accessible?

Always. We design for VoiceOver and TalkBack, dynamic type, sufficient contrast, large tap targets, focus order and reduced-motion preferences, tested on real devices with real assistive technology.

Do you provide post-launch support and updates?

Yes. Standard care plans cover OS updates (iOS 18, Android 15+), SDK upgrades, store-policy compliance, crash triage and small feature releases. Larger feature work runs on a quarterly roadmap.

Who owns the code, designs and developer accounts?

You do, fully. On launch we transfer the Git repository, Figma files, Firebase / Supabase projects and any third-party SDK accounts to your team. No platform lock-in, no proprietary frameworks you can't replace.

Can you integrate with our existing backend or product?

Yes. We integrate with REST and GraphQL APIs, OAuth / SSO, payment processors (Stripe, Apple Pay, Google Pay), CRM systems and analytics platforms. If your backend is HAPA Cloud-built, even better, one team, one stack.

Where is your team based?

London, UK. We work with clients across the UK, EU and North America. Discovery and weekly demos run remotely or in person depending on what suits you.

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The people who made it happen.

★★★★★
Hapa is awesome. I like it more and more each day because it makes my life a lot easier. Our direct bookings are up 40% since switching.
JCJohn CarterCFO · Harbour Hosts
★★★★★
We picked Simplicity after deep research. We get 140 field calls a day and their system makes sure all of it is streamlined, nothing slips.
MRMaddison RaeburnCOO · Avon Ruby
★★★★★
I have gotten at least 50 times the value from HAPA Cloud. The AI concierge alone saves us 20 hours a week on guest replies.
MSMeghan SørensenFounder · Woodvale Stays
★★★★★
The channel manager paid for itself in a month. Rates and availability stay in step across every OTA, so double bookings simply stopped happening.
PRPriya RamanRevenue Lead · Lowry Estates
★★★★★
Onboarding was the smoothest we have had with any supplier. The team mapped our workflow first, then shaped the system around how we already work.
CFCallum FraserOperations Director · Braemar Energy
★★★★★
Owner statements used to take three days every month. They are now generated automatically and our owners can see performance whenever they like.
HWHelen WalshFinance Lead · Kingfisher Co.

Let's build an app your users open daily.

Send a brief, a Loom or just a problem to solve. We'll come back within one working day with a clear next step.

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