Cross-platform Flutter apps
iOS 14+, Android API 24+, web (canvaskit and html renderers), Windows, macOS and Linux desktop from one Dart codebase. Material 3 and Cupertino widgets adapted per platform.
Services
Flutter App Development Services for US & EU Mobile, Web and Desktop Products
Senior Flutter and Dart engineering for funded mobile teams: Flutter 3.27 with Dart 3.6, Riverpod 2 or Bloc 8 state, GoRouter 14, Drift or Isar local persistence, FFI for native iOS / Android plugins, melos-managed monorepos, and CI on Codemagic, GitHub Actions or Bitrise that ships TestFlight and Play internal tracks every commit. One codebase to iOS, Android, web and desktop — without compromising on the native feel users actually notice. Dedicated teams from 12,000 EUR/month, project sprints from 25,000 EUR. Evaluating the stack first? See our Flutter capabilities and when to choose it over native or React Native.
9+Years in business
80+Senior engineers on staff
120+Projects delivered
71Client NPS
GDPR-aligned · ISO 27001 ready · SOC 2 Type II in progress · HIPAA-capable · CCPA-acknowledged · CET workday with 9 AM–1 PM ET overlap
Flutter wins when your product needs identical UX across iOS and Android (and increasingly web and desktop), when you cannot afford two separate native teams with different release cadences, and when your designers want pixel-precise custom UI rather than the platform-default look. We use it where it earns its place: B2C consumer apps with strong brand-driven UI, B2B field-service and logistics apps where iOS + Android parity is a contractual requirement, and white-label products where one codebase powers fifty branded apps. Our Flutter engineers average 6+ years on Dart, have shipped apps with 5M+ MAU on the Play Store and App Store, and know which Flutter packages to never use in production. We are GDPR-aligned · ISO 27001 ready · SOC 2 Type II in progress. See it in practice in our Crypto Wallet case study.
What we build with Flutter
State + navigation architecture
Riverpod 2 with code generation, or Bloc 8 with hydrated_bloc, GoRouter 14 with type-safe routes, freezed for sealed unions, dio or http for networking with retry interceptors.
Native integration + FFI
Custom platform channels in Swift / Kotlin, Dart FFI for direct C/C++ interop (encryption libraries, ML runtimes, hardware SDKs), pigeon for type-safe codegen of native bridges.
Auth + secure storage
Firebase Auth, Auth0, Supabase, Cognito, custom OIDC. flutter_secure_storage backed by Keychain and Keystore, biometric prompts via local_auth, certificate pinning for high-trust contexts.
Offline-first + sync
Drift (SQLite) or Isar for local persistence, PowerSync or custom CRDT sync, background sync via WorkManager (Android) and BGTaskScheduler (iOS), conflict resolution patterns that survive 30-day offline gaps.
Flutter modernisation
Migrating Flutter 2.x / 3.0–3.10 onto Flutter 3.27, null-safety completion, Provider / setState onto Riverpod 2, Navigator 1 onto GoRouter, single repo onto melos workspace with shared design system.
Stack and tooling
Flutter 3.27
Dart 3.6
Riverpod 2
Bloc 8
GoRouter 14
freezed
Dio
Drift
Isar
Hive
Firebase
Supabase
Sentry
Codemagic
Fastlane
melos
Pigeon
Dart FFI
Material 3
Cupertino
How an engagement runs
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01
Discovery
1–2 weeks: audit existing repo (or Figma file), decide Riverpod vs Bloc, decide GoRouter vs auto_route, decide REST vs GraphQL, decide Firebase vs custom backend, and write the ADR before code lands.
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02
Foundation
Sprint 1–2: melos monorepo with app + design_system + api_client + shared packages, very_good_analysis lints, golden tests via alchemist, CI on Codemagic or GitHub Actions, Fastlane for App Store / Play release.
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03
Build
Two-week sprints, trunk-based, Firebase Remote Config or ConfigCat for feature flags, widget tests + integration_test driver + golden tests, Sentry for crash reporting from day one.
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04
Operate
TestFlight and Play internal track on every merge, weekly external beta, store-listing optimisation, Sentry triage on-call rotation, monthly review of crash-free sessions and ANR rate, quarterly Flutter / Dart SDK upgrade.
Engagement models
Dedicated team
2–6 senior engineers embedded in your roadmap, daily standup in your channel, your repo, your CI, your on-call. Best for product roadmaps with a 6+ month horizon. From 12,000 EUR/month.
Project sprint
Fixed-scope, fixed-budget delivery: discovery + MVP + App Store and Play release. Best for new product lines, validated PoCs that need hardening, and stand-alone modules. From 25,000 EUR.
Staff augmentation
One or two senior engineers slotted into your existing squad, your stand-up, your process. Best for filling a known capability gap without disturbing team structure. From 7,500 EUR/month per engineer.
Three-month minimum on all tiers, month-to-month thereafter with 30 days notice. NDA, DPA, and IP assignment signed before kickoff.
What Flutter App Development Costs — and What Drives the Price
Most agencies keep the number for a sales call. Here are our published US & EU planning ranges so you can budget before discovery. Every app is scoped individually, but these three bands cover the common path from an embedded engineer to a full dedicated Flutter team.
Staff augmentation
From 7,500 EUR / engineer / month. One or two senior Flutter engineers slotted into your existing squad — your standups, your repo, your CI, your release process. Monthly rolling.
Project sprint
From 25,000 EUR. Fixed scope, fixed price: discovery + MVP + App Store and Play release, a Flutter 2.x→3.27 migration, or a Provider→Riverpod 2 refactor of a feature module.
Dedicated Flutter team
From 12,000 EUR / month. A two-engineer pod (senior + mid, plus fractional tech lead and DevOps); a standard 4–6 engineer product squad with QA and PM runs 28,000–42,000 EUR/month. Three-month minimum, then month-to-month.
What moves the number: how many targets you ship (iOS + Android only vs adding web and desktop — each surface adds design and QA); the depth of Flutter migration (2.x→3.27, null-safety completion, Provider/setState→Riverpod 2, Navigator 1→GoRouter); offline-first and sync complexity (last-write-wins vs CRDTs, background sync, multi-day offline gaps); how many native platform channels and Dart FFI plugins the app needs; and compliance scope (GDPR EU data residency, App Store Privacy Manifests, Play Data Safety, HIPAA-capable). A single-surface app on clean data sits at the bottom of the sprint band; a multi-surface product under a DPA writing to production systems sits at the top. App Store, Play and third-party API fees are billed on your own accounts, so you keep the cost lever.
Selected related work
FinTech · Crypto · Mobile
Crypto Wallet
Flutter iOS + Android companion for a custodial platform — biometric unlock, P2P transfers, fiat-crypto bridge, in-app exchanger.
HealthTech · Nutrition
BasilDoc
Cross-platform diet and meal-planning app on Flutter — calorie engine, recipe library, weekly meal-plan, grocery ordering.
Industries We Build Flutter Apps For
A cross-platform app is only as good as its fit with your regulatory and operational reality. We pair senior Flutter engineering with industry-specific compliance across US & EU markets, and share a codebase and release process with our cross-platform mobile and React Native teams when a product needs both stacks compared.
FinTech
Flutter iOS + Android wallets and payment apps with biometric unlock, secure Keychain/Keystore storage, certificate pinning and P2P transfers — as on our custodial Crypto Wallet build.
FinTech apps →HealthTech
GDPR-aligned, HIPAA-capable Flutter apps for nutrition, records and fitness — EU-region backends, calorie/meal engines and App Store subscriptions, as on our BasilDoc diet-planning build.
HealthTech apps →Logistics & Mobility
Offline-first field-service and last-mile Flutter apps with Drift/Isar local stores, background sync and conflict resolution that survives multi-day offline gaps on changing state.
Logistics apps →E-commerce & Retail
Two-sided marketplace and storefront Flutter apps grounded in your catalogue, with in-app payments, deep links and offline caching — as on our ZipIt buyer apps over a multi-tenant CRM.
Retail apps →Why US & EU teams pick YuSMP for Flutter app development
GDPR-aligned · ISO 27001 ready · SOC 2 Type II in progress · HIPAA-capable · CCPA-acknowledged
Senior engineers, not body shop
Every engineer on your account has 5+ years of production Flutter / Dart experience and a published app on the App Store and Play Store. No bait-and-switch from the senior who sold the deal.
CET workday + US overlap
CET-aligned squads with a guaranteed 9 AM–1 PM ET overlap for US clients — four hours of synchronous work per day, async docs for the rest. No 3 AM standups for anyone.
Compliance-fluent delivery
GDPR DPAs, SOC 2 Type I/II readiness, HIPAA controls for US healthtech, CCPA notices, App Store Privacy Manifests, Play Data Safety. The compliance work is built into the sprint, not bolted on before submission.
For regulated workloads we work directly with your auditor or fund's technical advisor and prepare evidence to the standard the reviewer expects — not the standard a generalist consultant assumes.
What clients say
We had a concept and tight timelines. YuSMP converted a Flutter skeleton into a production-ready nutrition app with a calorie engine, meal plans, and App Store subscriptions in four months. 90-day retention exceeded our benchmark by 30%.
Two-sided marketplaces are hard to get right. YuSMP built the Flutter buyer apps, the multi-tenant Symfony CRM, Laximo VIN catalog integration, and delivery management — a scope most agencies would have split into three separate contracts.
Frequently asked questions
Why pick Flutter in 2026 over React Native, native Swift/Kotlin, or Kotlin Multiplatform?
Flutter wins when pixel-perfect cross-platform UI parity matters more than feeling 100% native, when you want one team shipping iOS and Android (and web/desktop) from one repo, and when your design system is custom rather than platform-default. React Native wins when your team already lives in TypeScript and your app is mostly screens-on-top-of-APIs. Native Swift/Kotlin wins for AR/VR, deep OS integration, and apps with platform-specific UX expectations (e.g. iOS-only premium consumer apps). Kotlin Multiplatform wins when you want to share business logic but keep native UI — great for existing native teams adding code sharing without committing to one UI framework. We have shipped on all four and will tell you honestly during discovery.
Which Flutter and Dart versions do you standardise on?
Flutter 3.27 stable with Dart 3.6 as of 2026. Material 3 default for Android-leaning brands, Cupertino with adaptive widgets for iOS-leaning. Minimum supported iOS 14, Android API 24 (covers 99%+ of devices in EU and US markets). We pin Flutter SDK per-project via fvm so every contributor and CI runs the same exact build. Quarterly SDK upgrade reviews — we never sit on a Flutter version more than two minor releases behind stable in production.
Do you handle EU data residency, GDPR, App Store and Play privacy requirements?
Yes. Backend defaults to EU regions (AWS eu-central-1, GCP europe-west3, Supabase eu-central-1) with KMS keys held in the customer account. We ship App Store Privacy Manifests (mandatory from May 2024) declaring every required-reason API and SDK data collection. Play Data Safety section completed against the actual SDK inventory. GDPR consent via UMP (Google) or custom CMP integrated with our analytics and crash-reporting stack. Apple ATT prompt where IDFA is needed. Anonymous identifiers default, PII opt-in only.
How do you handle offline-first sync for field-service / logistics apps?
Drift (SQLite) or Isar as the local store, with our own sync layer or PowerSync when the customer wants managed sync. Conflict resolution defaults to last-write-wins on simple records and operational transforms or CRDTs on collaborative data. Background sync via WorkManager (Android) and BGTaskScheduler (iOS) on a 15-minute cadence with exponential backoff on failure. We have shipped a field-service app that survived a 27-day offline gap (vessel at sea) and synced 14 GB of inspection data on reconnect without a single conflict requiring manual resolution.
Can you migrate a Flutter 2.x or pre-null-safety codebase to Flutter 3.27?
Yes, this is a common engagement. Step 1: get the test suite green on the existing version. Step 2: complete null-safety migration (most teams stopped 80% in). Step 3: stepwise SDK upgrade 2.10 → 3.0 → 3.10 → 3.19 → 3.27 with green tests at each step. Step 4: replace deprecated APIs (RaisedButton → ElevatedButton, AccessibilityFeatures, BottomNavigationBar themes). Step 5: introduce Riverpod 2 or Bloc 8 alongside existing Provider/setState, migrate per feature. Typical 80k-LOC app takes 3 to 5 months without a feature freeze.
What does pricing look like for a Flutter dedicated team or project sprint?
Dedicated teams start at 12,000 EUR/month for a 2-engineer pod (typically 1 senior + 1 mid plus fractional tech lead and DevOps). Standard mobile squads are 4–6 engineers at 28,000–42,000 EUR/month with QA on real-device farm, DevOps for store releases, and PM. Fixed-scope project sprints (discovery + MVP + App Store and Play release) start at 25,000 EUR. All engagements include CET workday with 9 AM–1 PM ET overlap for US clients, NDA + DPA + IP assignment signed before kickoff, three-month minimum, then month-to-month with 30 days notice.
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