Els Labs
Mobile App Development

iOS and Android apps from a single codebase.

We build cross-platform mobile applications with Flutter that look, feel and perform like native apps — without the cost of maintaining two separate codebases. From MVP to enterprise rollout, we deliver apps that users love.

What we deliver

Built for performance, scale and clarity.

Cross-platform with Flutter

A single Dart codebase compiles to native ARM code for both iOS and Android, cutting development time and cost without compromising on performance or platform-specific UX conventions.

Native-quality UI & animations

Flutter renders at 120 fps with its own graphics engine, so we deliver fluid animations, custom transitions and pixel-perfect interfaces that feel truly native on every device.

Offline-first architecture

We build apps that work without an internet connection using local databases, background sync and conflict resolution — critical for field workers, commuters and rural UK areas with patchy coverage.

Secure authentication & data handling

Biometric login, OAuth 2.0, encrypted local storage and certificate pinning are standard in every app we ship. We follow OWASP Mobile Security guidelines and conduct penetration testing before launch.

Push notifications & engagement

We integrate Firebase Cloud Messaging and APNs with deep-link routing so your notifications land users on the exact screen they need — driving retention and re-engagement.

App Store & Play Store submission

We handle the full submission process including screenshots, metadata, privacy policies and review responses. Our first-time approval rate is above 95 per cent across both stores.

How we build it

A structured approach, every time.

01

Strategy & scoping

We define your target users, core features and platform requirements in a focused workshop. The output is a prioritised feature map, technical architecture document and a realistic timeline.

02

UX design & interactive prototype

High-fidelity Figma screens and a clickable prototype let you test every user flow before development begins. We validate designs with real users wherever possible to reduce costly rework.

03

Agile development & QA

We build in two-week sprints with testable builds delivered to TestFlight and Firebase App Distribution. Automated widget and integration tests run on every commit, and manual QA covers edge cases across real devices.

04

Launch, monitoring & iteration

After store approval we monitor crash rates, ANR events and user analytics. We provide a 30-day hypercare window followed by optional monthly retainer plans for updates, OS compatibility and new features.

FAQ

Common questions.

How much does mobile app development cost in the UK?+

A cross-platform Flutter app typically ranges from £15,000 for a simple utility app to £80,000+ for a feature-rich platform with real-time data, payments and admin dashboards. We scope every project individually and provide a fixed-price quote after our initial discovery session, so you know the full cost upfront.

How long does app development take?+

An MVP with core features usually takes 10–14 weeks from kick-off to store submission. More complex apps with integrations, offline support and advanced animations can take 16–24 weeks. We agree milestones during scoping and share testable builds fortnightly so you can track progress throughout.

Should I build a native or cross-platform app?+

For the vast majority of business applications, cross-platform development with Flutter delivers near-identical performance to native at roughly 40 per cent lower cost. We recommend native development only when you need deep hardware integration such as ARKit, custom Bluetooth protocols or heavy GPU computation. We are happy to advise on the best approach during a free consultation.

Do you develop for both iOS and Android simultaneously?+

Yes. With Flutter we maintain a single codebase that compiles to both platforms. This means features, bug fixes and updates ship to iOS and Android at the same time, reducing maintenance overhead and ensuring a consistent user experience across devices.

Can you integrate my app with existing backend systems?+

Absolutely. We regularly integrate apps with REST and GraphQL APIs, third-party services such as Stripe, Twilio and Firebase, and enterprise systems including Salesforce and SAP. If your backend needs updating to support mobile, we can handle that too.

What happens after the app is launched?+

We offer ongoing maintenance plans that cover OS updates, dependency upgrades, performance monitoring, bug fixes and new feature development. Our SLA-backed support ensures your app stays compatible with the latest iOS and Android releases and continues to meet store guidelines.

Let's build

Have a product worth building properly?

Tell us where you're headed. We'll come back within two working days with a clear, honest view of how we'd build it.