Mobile Apps That Ship,Not Prototypes That StallNative iOS, Native Android, and React Native — One In-House UK Team.
Most app projects die in the gap between a designer's mockup and a working build. We close that gap with a fixed-price Technical Specification agreed before development starts — every screen, every integration, every store requirement — then ship to both stores on a date you can plan a launch around.
Delivered
Rating
Time
Ownership
Mobile App Development Services We Deliver
Native where it matters, cross-platform where it saves you money — scoped, specified, and delivered by our in-house team of 150+ engineers.
Native iOS Development
Swift and SwiftUI apps that feel like they came with the phone.
- Swift & SwiftUI architecture
- iOS 18 API adoption
- TestFlight beta distribution
- App Store review handling
Native Android Development
Kotlin and Jetpack Compose builds tuned for real Android hardware.
- Kotlin & Jetpack Compose
- Material 3 design system
- Play Console release tracks
- Fragmentation & device testing
React Native & Flutter
One codebase, two stores — without the usual cross-platform compromises.
- React Native (New Architecture)
- Flutter & Dart
- Native module bridging
- Over-the-air update pipelines
Mobile Backend & APIs
The server side your app depends on, built by the same team.
- REST & GraphQL API design
- Push notification infrastructure
- Offline sync & conflict resolution
- Authentication & session security
App Store Launch & ASO
Getting approved is a process, not a formality. We run it.
- Store listing & screenshot production
- Privacy nutrition labels & data safety
- Rejection response & resubmission
- App Store Optimisation setup
Maintenance & OS Upgrades
An app is only finished until the next OS release.
- Annual iOS & Android compatibility
- Crash monitoring & triage
- Dependency & SDK updates
- Feature development on retainer
Why UK Businesses Choose Mtoag for Mobile App Development
Three things that separate us from every other agency in the UK.
Fixed-Price. No Surprises.
Before writing a line of code, we produce a Technical Specification — a fixed-price, fixed-scope document listing every feature, integration, and delivery milestone. You sign it. We build it. The price you sign is the price you pay.
150+ In-House Engineers. No Subcontractors.
100% of Mtoag's engineering work is done by direct employees — never freelancers, never agencies, never offshore subcontractors. Your senior developer has worked at Mtoag for an average of 4+ years.
Full IP Ownership from Day One.
Your source code, design files, and all intellectual property transfer to you on final payment. We sign an NDA before any technical discussion. No vendor lock-in.
The Tech Stack That Powers Our Solutions
Sixteen years of production experience across mobile, web, enterprise, open-source, and search — every technology below is one we ship for UK clients, not just list on a page.
From native performance to cross-platform speed, we build mobile experiences that feel first-class on every device.
Modern, fast, accessible websites and web apps built on frameworks that scale with your business, not against it.
Enterprise-grade architecture built for security, compliance, and systems that need to talk to each other reliably.
Proven open-source platforms customised and hardened for real commercial traffic — not a stock install.
Technical SEO built into the codebase from day one — because rankings are an engineering outcome, not a marketing add-on.
All versions current as of July 2026. We track and adopt major releases within 90 days.
Mobile App Development Case Studies
All projects live in production since launch.
Our Mobile App Development Process
The same six-step process on every project. No improvising. No scope creep. No surprises.
Discovery and Technical Scoping
A structured 45-minute discovery call followed by a written Technical Specification defining every screen, integration, offline behaviour, and store requirement. You review and sign it before we charge a penny.
UX Flows and Interactive Prototype
Wireframes and a tappable prototype covering the core journeys, tested on real devices so navigation decisions are settled before a single screen is coded.
Agile Development and Build
Two-week sprints with TestFlight and Play Console internal builds you can install from day one. Weekly video demos and Slack access to your project manager. Every merge reviewed by a senior engineer.
Device Lab and QA Testing
Automated unit and UI tests plus manual regression on a physical device matrix — current and two prior OS versions, small and large screens, slow networks, and low battery states.
Store Submission and Launch
We prepare store listings, screenshots, privacy declarations, and age ratings, then handle the App Store and Play Store review process end to end — including any rejection responses.
Support and OS Upgrades
Post-launch SLA options from 8-hour response to 24/7 monitoring, plus annual iOS and Android release compatibility work so your app never breaks on an OS update.
All timelines are fixed in the Technical Specification.
Start Your Project — Get Free AuditMobile App Quality Standards
Every Mtoag project is measured against the same benchmarks before it ships.
- Cold start under 2 seconds on mid-range Android hardware, not just flagship devices
- WCAG 2.2 Level AA: VoiceOver and TalkBack tested, dynamic type and contrast passed
- Crash-free sessions above 99.5%, monitored from launch day with alerting to our on-call team
- Tested on a physical device matrix covering the current OS and two prior versions
Mobile App Development Questions Answered
10 direct answers. No sales language.
A typical UK mobile app runs £18,000–£80,000 depending on scope. A single-platform MVP starts around £12,000; a multi-platform product with a custom backend, payments, and admin tooling sits at the upper end. Mtoag quotes a fixed price from a written Technical Specification rather than an hourly estimate.
Eight to fourteen weeks from signed specification to store submission is typical. Simple utility apps can be delivered in six weeks; platforms with real-time features, payments, or AI take fourteen to twenty. Your timeline is fixed in the specification before development starts.
Native suits apps that lean on device hardware, need the smoothest possible interaction, or ship platform-specific features. React Native or Flutter suits apps where most logic is shared and budget matters — usually 30–40% cheaper than two native builds. Mtoag recommends a stack during scoping, after understanding what the app actually does.
Yes. Most Mtoag projects ship to both stores. Where a cross-platform stack fits, both come from one codebase; where native is the right call, both native builds are delivered by the same in-house team against a shared API layer.
We do. Store listings, screenshots, privacy declarations, data safety forms, and age ratings are prepared by Mtoag, and we handle the review process — including responding to rejections and resubmitting. Apps are published under your developer account, which you own.
Only if someone maintains it. Every Mtoag maintenance retainer includes annual OS compatibility work — we test against the developer betas each summer and ship a compatible release before the public OS launch, so your app never breaks for users on day one.
Yes, 100%. Source code, design files, and all intellectual property transfer to you on final payment, written into every Mtoag contract as standard. No IP buyout fee, no vendor lock-in.
Yes. We start with a paid technical audit of the existing codebase and store accounts, then give you an honest assessment — whether it is worth continuing or cheaper to rebuild. Roughly half the takeover projects we audit are worth continuing.
Yes. APIs, databases, push infrastructure, and admin panels are built by the same in-house team, which removes the finger-pointing that happens when an app agency and a backend agency disagree about whose bug it is.
Every project includes a 30-day post-launch window covering bug fixes at no extra cost. After that, maintenance retainers cover crash monitoring, SDK updates, OS compatibility, and ongoing feature development.
Still have questions? Call our team: +44 (115) 888-0557
Serving Mobile App Development Clients Across the UK
UK project managers available for on-site visits. Remote delivery available worldwide.
Let's Build Your Mobile App.
Free Audit. No Commitment.
Tell us what you need to build. We'll send a free Technical Specification within 5 business days — with fixed scope and fixed cost.