HomeServicesApps

Apps people keep using.

We design, build and launch iOS and Android apps that feel native and stay simple to use. One team takes your idea from first screen to App Store.

  • Native feel
  • One shared codebase
  • Launch-ready listings

Many app projects stall between design and launch, with the work split across freelancers who never talk to each other. We handle design, build, payments and store launch in one team, with a clear plan from the first call.

The numbers we report.

After launch, we track what matters. Here's the kind of report you get, shown with sample data. How we report results

App reportSample data

Downloads

12.4k▲ 33%

Trial starts

2,180▲ 41%

Trial to paid

34%▲ 6 pts

Day 7 retention

38%▲ 5 pts

Monthly downloads

This yearLast year
CApp Store launchCPaywall test wonCCreator campaign
Monthly downloads, sample data: this year against last year
MonthThis yearLast year
Nov400328
Dec479372
Jan622410
Feb733493
Mar937553
Apr1,057631
May1,281713
Jun1,437787
Jul1,666923
Aug1,9091,001
Sep2,1031,125
Oct2,3001,196

Activity

Live feed
  • New downloadApp Store+1Just now
  • Trial convertedAnnual plan+£29.992m ago
  • Review leftApp Store5 stars9m ago
  • Retention checkThis cohort39% day 724m ago

Sample data, shown to illustrate the reporting you get. It is not a client result.

Everything from idea to store.

Choose the platforms and features you need, and we plan, design and build every part of the app together.

iOS apps

Built to feel at home on iPhone.

We build iPhone and iPad apps that follow Apple's design guidelines and behave the way people expect. Native features like widgets, notifications and Apple Pay are added where they help.

  • Swift or React Native
  • Apple design guidelines followed
  • Widgets and notifications
  • Sign in with Apple
Explore iOS apps

Android apps

Made for every Android phone.

We build Android apps that follow Material Design and run smoothly on budget and flagship phones. Every build is tested across screen sizes before it ships.

  • Kotlin or React Native
  • Material Design 3
  • Tested across screen sizes
  • Google Play policy checks
Explore Android apps

Cross-platform apps

One codebase, both app stores.

With React Native and Expo, we build one app that runs on iPhone and Android. You get native performance, faster updates and a single codebase to maintain.

  • React Native and Expo
  • Shared code for both platforms
  • Over-the-air updates
  • Native modules where needed
Explore cross-platform apps

App design

Screens that are easy to use.

We design every screen in Figma, from onboarding to settings, and build a clickable prototype you can test on your phone. You approve the full flow before development starts.

  • User flows and wireframes
  • Interface design in Figma
  • Clickable phone prototype
  • App icon and splash screen
Explore App design

Subscriptions and paywalls

In-app payments ready at launch.

We add in-app subscriptions, free trials and one-off purchases through the App Store and Google Play, managed with RevenueCat. Paywalls are designed to be clear and compliant with store rules.

  • Subscriptions and free trials
  • RevenueCat integration
  • Paywall design and testing
  • Store billing rules followed
Explore subscriptions and paywalls

Launch and ASO

Ready for review and discovery.

We prepare your App Store and Google Play listings, screenshots and keywords, then handle submission and review. AI helps us research keywords quickly, and a person checks every listing before it goes live.

  • Store listings and screenshots
  • Keyword research for discovery
  • Submission and review handling
  • Privacy labels completed
Explore launch and ASO

The detail that matters.

The parts that make the biggest difference, and how we handle each one.

A clickable prototype before any code.

You tap through the real flow on your own phone before we build anything. Changes at this stage are quick, so the app you approve is the app we build.

Build progress

Working
  • User flows mappedDone
  • Screens designed in FigmaDone
  • Prototype tested on deviceDone
  • Core features builtLive
  • TestFlight betaNext

Onboarding that brings people back.

The first minutes in an app decide whether people return. We design onboarding, notifications and reminders that help users reach the useful part of your app quickly.

Day one flow

TriggerUser completes onboarding
WaitOne day
MessagePush reminder to return
SplitOpened app or not
EmailTips for getting started

Tools chosen for the long run.

We use proven tools that are well supported and easy to hand over. If you later grow an in-house team, they can pick up the codebase without starting again.

Our app stack

React NativeExpoSwiftKotlinFigmaRevenueCatSupabaseFirebaseStripeTestFlightOpenAIClaude

Work and examples.

Real projects first, then examples of how we'd approach yours.

Example projects

How we would approach it. Illustrations, not client results.

Example project · iOS apps

A boutique gym that wants members booking on iPhone

Members book classes through a mobile website that logs them out and forgets their details. The owner wants a proper iPhone app with reminders, a membership pass in Apple Wallet and quick rebooking.

  • Map booking, rebooking and cancellation flows
  • Design SwiftUI screens to Apple's guidelines
  • Add Wallet passes and class reminders
See iOS apps

Example project · Android apps

A trades firm giving engineers an Android job app

Field engineers carry a mix of company Android phones and rugged devices, and job details arrive by text and paper sheets. The firm wants one app for jobs, photos and customer signatures, even with weak signal.

  • Map the engineer's day from first job to sign-off
  • Design large, glove-friendly screens in Material 3
  • Build offline storage that syncs when signal returns
See Android apps

Example project · Cross-platform apps

A coffee subscription brand wanting iPhone and Android apps

Customers manage their coffee deliveries through a website that is awkward on phones. The brand wants an app on both stores for skipping deliveries, changing blends and getting dispatch alerts, without paying for two separate builds.

  • Plan shared screens and platform-specific details
  • Build one Expo app in TypeScript
  • Connect subscriptions to the existing Shopify store
See cross-platform apps

How it works.

From first call to launch and beyond. You'll always know what's happening and what's next.

  1. 01

    Scope

    We define the core features, platforms and launch date with you.

  2. 02

    Design

    We design every screen and test a clickable prototype on your phone.

  3. 03

    Build

    We develop in short cycles and share working test builds as we go.

  4. 04

    Test

    We test on real devices with beta users through TestFlight and Google Play.

  5. 05

    Launch

    We submit to both stores, handle review and support you after release.

What you get.

Included with apps from Infinity, whichever way you start.

  • Feature plan and user flows
  • Full interface design in Figma
  • Clickable prototype for testing
  • iOS and Android apps
  • Subscriptions and paywall set up
  • App Store and Google Play listings
  • Analytics and crash reporting
  • Full source code and documentation

Ways to start.

Apps from £2,000. Every option is confirmed after a short call, with a fixed price before we start.

Prototype

Prove the idea on screen.

Suits founders who want to validate an idea before committing to a full build.

  • Feature plan and user flows
  • Key screens designed
  • Clickable phone prototype
  • Build plan and estimate
Start a project
Recommended

Launch app

A complete app in both stores.

Suits businesses ready to launch a polished app on iPhone and Android.

  • Full design and prototype
  • React Native and Expo build
  • Subscriptions and analytics
  • App Store and Google Play launch
Start a project

Ongoing product

A team that keeps improving it.

Suits live apps that need regular updates, new features and support.

  • Monthly feature releases
  • OS updates and bug fixes
  • Store listing improvements
  • Usage reports and planning
Start a project

Free tools.

Do it yourself with the same checklists and calculators we use. No sign-up needed. See them all

Questions, answered.

How much does an app cost?

Every app is quoted after a short call, with a fixed price agreed before we start. Ongoing updates and support are covered by a fixed monthly fee.

How long does it take to build an app?

A focused first version usually takes a few months, depending on the features. We agree a date before we start and share test builds throughout so you see progress.

Should I build native or cross-platform?

For most businesses we recommend React Native and Expo, which gives you one codebase for iPhone and Android. We suggest Swift or Kotlin when your app needs deep platform features.

Will you handle App Store and Google Play submission?

Yes. We prepare your listings, privacy details and screenshots, submit the app and respond to any review feedback. The app is published under your own developer accounts.

Can you add AI features to my app?

Yes. We build features with OpenAI and Claude where they genuinely help your users, such as smart search or personalised suggestions. A person tests every AI feature before it ships.

Do I own the code?

Yes. You own the source code, designs and store accounts. We hand over documentation so another developer or your own team can continue the work.

Let's build your app.

Tell us what you need. Charlie will come back with a plan and a price, usually within one working day.

hello@infinity.agency