Flutter App Development
Cross-platform iOS and Android apps built in Flutter with Dart. Single codebase, native performance, and pixel-perfect UI. The most cost-effective path to a production mobile app in 2026.
Starting from 5000 GBP
App Development Company UK
UK companies pay twice when they hire separate iOS and Android teams. Innovatrix Infotech builds Flutter apps that run natively on both platforms from a single codebase, cutting development time by up to 40 percent without sacrificing performance or UX. Our 12-person engineering team has shipped apps for e-commerce, service businesses, and consumer markets. We build in Flutter because it is genuinely the best cross-platform framework in 2026, not because it is the cheapest to sell.
- Native iOS and Android app from a single Flutter codebase
- Pixel-perfect UI across all UK device sizes and OS versions
- 60fps performance with Flutter's Impeller rendering engine
- Firebase or AWS backend integrated from day one
- App Store and Google Play submission handled by our team
- GDPR-compliant data handling and privacy policy integration
50+ Clients Served
4+ Years in Business
UK/AUS/US Overlap
Last updated 2 April 2026
What we build
What does App Development Company UK include?
Flutter MVP Development
Focused MVP builds for UK startups and scale-ups. We scope the minimum valuable product, build it in 6 to 10 weeks, and get you into the hands of real users fast.
Custom App UI/UX Design
Product design in Figma before a single line of code is written. User flows, wireframes, and high-fidelity prototypes that your stakeholders can test and approve.
App Backend and API Development
Node.js or Python backends, RESTful and GraphQL APIs, Firebase Firestore or PostgreSQL, and AWS-hosted infrastructure. Full-stack development from one team.
App Store Submission and Optimisation
We handle both App Store (iOS) and Google Play (Android) submission, screenshot design, metadata optimisation, and review cycle management.
App Maintenance and Feature Development
Post-launch retainers covering feature additions, OS version compatibility, performance monitoring, crash reporting, and regular dependency updates.
Free Download: App Development Cost Estimator
Break down app costs by feature — auth, payments, push notifications, maps, chat. See Indian and international rates side by side.
Service Overview
Everything you need to know about App Development Company UK
Innovatrix Infotech is a DPIIT-recognised app development company serving UK businesses that need a mobile app built properly. We specialise in Flutter app development, Google's open-source framework that lets us build a single codebase and ship a native-quality app on both iOS and Android simultaneously. Flutter is now the most adopted cross-platform framework globally, and for good reason: it renders using its own graphics engine (Skia and Impeller), which means pixel-perfect UI on every device without platform-specific quirks. Our approach to app development differs from most agencies. We do not start by asking how many screens you need. We start by understanding the job the app does for your user, what the critical path is, and where the technical risk lies. That process produces better apps and fewer surprises. We work in 2-week sprints so you see working software regularly. Pricing is fixed. Most UK app projects with us run from five thousand to twenty-five thousand GBP depending on scope, with post-launch retainers available for ongoing feature development and maintenance.
What's included
Everything you need to succeed with App Development Company UK
Native Performance Without Native Cost
Flutter compiles to native ARM code. It uses its own rendering engine (Impeller), which means 60fps animations and sub-100ms screen transitions on any modern device.
Single Codebase, Full Parity
One Dart codebase that runs identically on iOS and Android. No platform-specific bugs, no feature disparity, no maintaining two separate repositories.
Offline-First Where Needed
For field service, logistics, and healthcare use cases, we architect apps to work offline and sync when connectivity returns. Critical functionality works without a signal.
Analytics and Crash Reporting Built In
Firebase Analytics, Sentry crash reporting, and custom event tracking are configured from day one. You know how users behave and when things break.
Why choose us
Why businesses trust us for App Development Company UK
0%
Cost Saving vs Native
One Codebase, Two Platforms
Flutter produces a single Dart codebase that compiles natively to iOS and Android. You get two production apps for the development cost of one. Most UK clients save 35 to 40 percent versus building two separate native apps.
0%
Fixed-Price Projects
Fixed-Price Engineering
Every app project is scoped and fixed-price before we start. You review working software every two weeks. No surprise invoices, no hourly billing, no scope creep.
No. 1
Cross-Platform Framework
Google-Backed Framework
Flutter is backed by Google and is the most-used cross-platform framework in 2026. We chose it because it is the technically correct choice, not because it is easy to sell.
0+
In-House Engineers
12-Person In-House Team
Our entire engineering team is in-house. The same engineers who scope your app build it. No subcontracting, no offshore handoffs, no communication lag.
Our tech stack
Technologies we use for App Development Company UK
Frontend
Flutter
Dart
Backend
Firebase
Node.js
PostgreSQL
GraphQL
Tools
AWS Amplify
Riverpod / BLoC
Figma
Google Play Console
Apple App Store Connect
Sentry
How it works
Our process — start to finish
Discovery and Scoping
We map the user journeys, define the feature set, and identify technical risks. Deliverable: a fixed-price proposal with sprint milestones and a decision on Flutter architecture (BLoC or Riverpod).
UI/UX Design
High-fidelity Figma designs for every screen and state. Interactive prototypes for key user flows. You test the app before we write a line of code.
Sprint Development
2-week development sprints with a testable build at the end of each sprint. You install the build on your device and test it directly. Feedback drives the next sprint.
Backend and Integration
API development, Firebase or AWS backend setup, third-party service integrations (payments, maps, notifications), and data model finalisation.
QA and Submission
Device compatibility testing across iOS and Android versions, performance profiling, App Store and Google Play submission, and review cycle management.
Launch and Monitoring
Post-launch monitoring with crash reporting, analytics review, and a 30-day support window included. Optional retainer for ongoing feature development.
Typical timeline: 12 weeks
Client stories
What our clients say
Honest words from people who've been through the process. No stock photos, no made-up companies.
“When two freelancers ran away with our money, we had lost all trust in agencies. Innovatrix didn't just rebuild our store — they rebuilt our confidence. Four years later, we've gone from one lakh to over one crore in revenue. They're not our vendor, they're our technology partner.”
G
Garima Ahuja
Co-founder, FloraSoul India
“We had jewellery but no digital presence. Innovatrix gave us a Shopify store that actually feels like walking into a jewellery showroom. The tiered discounts and WhatsApp integration alone doubled our repeat customers. We went from zero online orders to processing 50+ orders a day within four months.”
M
Mukesh Sethiya
Founder, Zevarly
“Before this system, our team was glued to their phones all day just answering the same questions over and over. Now those hours are back, and our customers actually get faster responses than when we were doing it manually. Rishabh and his team understood our operations deeply before writing a single line of code.”
A
Aman Bahri
Director, Bandbox Group
Industries we serve
Industries we help with App Development Company UK
E-commerce and Retail
Shopping apps, loyalty programmes, scan-to-buy, and order tracking for UK retailers and D2C brands.
Food and Hospitality
Ordering apps, table booking, loyalty cards, and kitchen management tools for UK restaurants and hospitality groups.
Healthcare and Fitness
Patient apps, appointment booking, health tracking, and wearable integration with full UK GDPR compliance.
Logistics and Field Service
Driver apps, job dispatch, route optimisation, proof of delivery, and real-time tracking for UK logistics firms.
Finance and Fintech
Personal finance tools, expense tracking, investment dashboards, and payment apps with biometric authentication.
Education and E-learning
Course apps, quiz tools, progress tracking, and offline content delivery for UK education providers.
Questions answered
Common questions about App Development Company UK
How we compare
Agency vs freelancer vs in-house
| Feature | Our Approach | Freelancer | In-House |
|---|---|---|---|
| Platform Coverage | iOS and Android from one codebase | Often one platform only | Requires two teams |
| Framework | Flutter (native performance) | React Native or template | Depends on hire |
| UI Quality | Pixel-perfect at 60fps | Varies significantly | Depends on designer |
| Pricing Model | Fixed-price per sprint | Hourly, unpredictable | Full salary overhead |
| App Store Submission | Fully managed | Client handles usually | Internal process needed |
| Post-Launch Support | Retainer or SLA available | Ad hoc | Internal queue |
Platform Coverage
Our ApproachiOS and Android from one codebase
FreelancerOften one platform only
In-HouseRequires two teams
Framework
Our ApproachFlutter (native performance)
FreelancerReact Native or template
In-HouseDepends on hire
UI Quality
Our ApproachPixel-perfect at 60fps
FreelancerVaries significantly
In-HouseDepends on designer
Pricing Model
Our ApproachFixed-price per sprint
FreelancerHourly, unpredictable
In-HouseFull salary overhead
App Store Submission
Our ApproachFully managed
FreelancerClient handles usually
In-HouseInternal process needed
Post-Launch Support
Our ApproachRetainer or SLA available
FreelancerAd hoc
In-HouseInternal queue
Certified PartnersRecognised by the platforms
Recognised by the platforms
you already trust.
Government registrations, platform partnerships, and ecosystem credentials that verify the operating standards behind every engagement.
Payment Options
Pay the way that works for you
We accept every major payment method globally — from cards and PayPal to international bank transfers, India-specific UPI, and direct NEFT/RTGS.
Stripe
Cards & digital wallets
Visa · Mastercard · Apple Pay · Google Pay · AMEX
PayPal
Global online payments
PayPal balance · Linked cards · Bank accounts
Wise
International bank transfer
USD · GBP · EUR · AUD · CAD · SGD · AED + 40 more
Razorpay
India — all local methods
UPI · Net Banking · Cards · Wallets · EMI
Bank Transfer
Direct NEFT / RTGS transfer
All Indian banks · Same-day RTGS · NEFT · IMPS
All transactions are processed securely. We never store card details.
Free Download: App Development Cost Estimator
Break down app costs by feature — auth, payments, push notifications, maps, chat. See Indian and international rates side by side.
Get started
Ready to talk about your project?
Whether you have a clear brief or an idea on a napkin, we'd love to hear from you. Most projects start with a 30-minute call — no pressure, no sales pitch.
No upfront commitmentResponse within 24 hoursFixed-price quotes