Services / App developmentiOS · Android · Cross-platformApps people keep opening.
We design, build and grow native and cross-platform apps for iOS and Android — from a first MVP to products opened millions of times a month.
Across our clients' apps · 2019 — 2026
30+ apps in the stores · 12M downloads
4.8★ average rating · 99.9% crash-free
- Kestrel Health
- Northwind
- Meridian Labs
- Halcyon & Co
- Aurelia
- Vantage
01 — What's included
Every feature,
considered.
The details users never notice — until they're missing. Every build ships with these as standard, not as change requests.
Offline-first sync
Works on the train, syncs when signal's back. No lost data, no spinners.
Biometric sign-in
Face ID, fingerprint and passkeys — secure without password-reset emails.
Accessible by default
Dynamic Type, VoiceOver and TalkBack tested on every release.
Push that respects people
Segmented, quiet-hours-aware notifications that bring users back.
Payments & subscriptions
Apple Pay, Google Pay, Stripe and in-app purchases, validated server-side.
Analytics you'll act on
Funnels, retention cohorts and crash reporting wired in before launch.
02 — Platforms
Native, cross-platform,
or both.
We're fluent in all four, so the recommendation follows your users, budget and roadmap — not our habits.
| Compare | 01iOSSwift · SwiftUI | 02AndroidKotlin · Compose | MOST CHOSEN FOR MVPsFlutterDart · One codebase | 04React NativeTypeScript · Expo |
|---|---|---|---|---|
| Best for | iPhone-first premium products and deep Apple integrations. | Android-heavy markets, enterprise fleets and custom hardware. | Pixel-perfect brand UI on both stores from one codebase. | Teams with a React web app who want to share logic and talent. |
| Performance | ||||
| Time to both stores | ||||
| Native API access | ||||
| CODE SHARED iOS / ANDROID | 0% | 0% | ~95% | ~85% |
| TYPICAL MVP | 12 wks | 12 wks | 10 wks | 11 wks |
Relative rating · 5 = best · Typical MVP = both stores for cross-platform, one store for native
Also: tablet, watchOS, Wear OS and PWAs.
03 — How it works · Lifecycle
From first tap
to scale.
Three phases, one team. Each ends with something real in users' hands — and a clear decision about what comes next.
- Phase 01 · Weeks 1 – 10
MVP
Prove the core loop with real users, fast.
- Product workshop & user flows
- Prototype tested with 5 real users
- Core features on iOS + Android
- TestFlight & internal beta
- Analytics event plan
OutcomeA shippable app — and the data to decide what's next.
- Phase 02 · Weeks 10 – 14
Launch
Get into the stores, then into people's habits.
- App Store & Google Play submission
- Store listing, screenshots & ASO
- Onboarding & push strategy
- Staged rollout & crash monitoring
- Launch-day war room
OutcomeApproved, live and climbing the category charts.
- Phase 03 · Month 4 onwards
Scale
Grow retention, revenue and the team behind it.
- Fortnightly release train
- A/B tests on onboarding & paywalls
- Performance & battery budgets
- Backend scaling & cost control
- Quarterly roadmap reviews
OutcomeCompounding retention — not a one-off launch.
04 — Backend & integrations
The part users
never see.
Apps are only as good as what's behind them. We build the APIs, data and integrations too — so one team owns the whole experience.
Data & backend
- FirebaseAuth · DB
- SupabasePostgres
- Node.js APINestJS
- AWS / GCPInfra
- Offline syncSQLite
- Auth & SSOOAuth
Services & SDKs
- Stripe & IAPPayments
- Apple / Google PayWallet
- HealthKitHealth
- Maps & locationGeo
- APNs / FCMPush
- Mixpanel · SentryData
Security first
OWASP MASVS checks, encryption at rest and in transit, pen-tested before launch.
Compliance-ready
HIPAA, GDPR and SOC 2-friendly architecture when your sector needs it.
You own it all
Your cloud accounts, your keys, your repos — handed over on day one.
05 — App store results
Rated by the people
who matter.
Not our opinion — theirs. Aggregated public ratings and store features across apps we've built and still maintain.
- 5 ★84%
- 4 ★11%
- 3 ★3%
- 2 ★1%
- 1 ★1%
- App Store4.8 ★
- Google Play4.7 ★
Finally a health app my mum can use
Booked a video visit in under a minute and the reminders actually help. Five stars without thinking.
Fast, calm, no clutter
Offline mode saved me on a flight. Syncs the second I land. This is how apps should feel.
Our customers noticed
Ratings went from 3.1 to 4.7 after the rebuild. Support tickets dropped by half.
- 14Countries featured in 'Apps We Love'
- Top 10Health & Fitness in 6 markets
- 2×Google Play Editors' Choice
- −48%Avg. 1-star reviews after rebuild
KESTREL PATIENT APP · iOS + ANDROID · FLUTTER
06 — Case study
Kestrel Health
A regional clinic group losing patients to no-shows and a phone line that rang out. We shipped one Flutter app for booking, video visits, results and reminders — live on both stores in 11 weeks.
- 62%30-day retentionFrom 21% on the old app
- 4.8★App Store rating41K ratings
- 210kDownloadsFirst 12 months
- −38%Missed appointmentsSmart reminders
“Patients open it more than they open our emails. It's become the front door of the clinic.”
- Flutter
- Firebase
- Node.js API
- HealthKit
- Twilio Video
07 — Engagement models
Pick how we
work together.
Start with a fixed-price sprint, keep a dedicated team, or hand us an app that's already live. Switch models as you grow.
- 01Where most start
MVP sprint
Fixed scope · fixed price
Best for
Founders and new product lines that need to validate fast.
- Workshop, flows & tested prototype
- iOS + Android MVP from one codebase
- Store submission & launch support
- 02
Dedicated team
Monthly retainer
Best for
Scale-ups with a roadmap and no time to hire a full team.
- PM, designer, 2–4 engineers & QA
- Fortnightly releases to both stores
- Cancel with 30 days' notice
- 03
Care plan
Support & evolution
Best for
Live apps that need to stay fast, secure and current.
- Yearly iOS / Android OS updates
- Crash monitoring with response SLA
- 8 – 40 developer hours a month
Inheriting an app? We start with a 2-week code & UX audit — credited if you continue.
Prices ex. VAT · NDA on request · You own the IP
08 — FAQ
Asked before
every app.
How much does an app cost?
Most MVPs for iOS + Android land between $28k and $60k. After a free product workshop you get a fixed quote — not an estimate that grows.
Native or cross-platform?
Flutter or React Native suits most products and roughly halves the cost of two stores. We go native for deep device features or iOS-only polish.
How long until we're in the stores?
A typical MVP is in TestFlight by week 8 and live on both stores by week 12, store review time included.
Do you handle store approval?
Yes — listings, screenshots, privacy labels and reviewer replies. None of our apps has ever been permanently rejected.
Who owns the code and accounts?
You do. Repos, developer accounts and cloud infrastructure sit in your name from day one.
Can you take over an existing app?
Often. We start with a two-week audit of code, crashes and reviews, then propose a rescue or a rebuild — honestly.
What happens after launch?
Most clients move to a care plan or a dedicated team. We watch crashes, ship OS updates and keep pushing retention up.
Will you sign an NDA?
Happily — before the first call if you like. Your idea stays yours.
Something we didn't cover?
Ask a product lead09 — Start your app
Let's put your app
in pockets.
Tell us about the app — who it's for, which platforms, any deadlines. We'll reply within one business day and set up a free product workshop.
What happens next
- 01We reply within one business day
- 0230-minute discovery call
- 03Proposal & fixed quote within a week