Custom Mobile App Development

Innovate. Design. Mobilise. Your visions, realized.

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Do you need smart apps to help your business grow?

At our core, we’re here to help your business thrive by bringing your mobile app vision to life. As a leading agency in custom mobile app development, we’ve crafted numerous powerful solutions that drive success.

In today’s fast-paced world, mobile apps aren’t just convenient – they’re indispensable. They’ve become deeply integrated into our daily routines, from earning loyalty points for a free coffee to accessing real-time business performance reports. For businesses, this means an unparalleled opportunity to connect with customers.

A mobile app offers a direct and immediate channel to engage your audience, fostering deeper loyalty and uncovering new avenues for growth. Whether it’s enhancing the customer experience or streamlining internal operations, the benefits are vast.

Ready to see how a custom mobile app can transform your business? Let’s explore the possibilities together.

Sales

It’s a fact: mobile is your winning solution for sales.

More people are searching for and buying products and services from their smartphones than ever before. It’s easy to see why: phones are always within reach, acting as personal computers that make quick Browse, comparisons, and purchases incredibly convenient.

If your business offers any kind of service, a mobile app isn’t just an extra – it’s a necessity. It’s a powerful tool designed to boost your visibility, enhance customer convenience, and ultimately drive more sales.

Better Customer Engagement

Today’s customers demand instant access and immediate answers, and a mobile app delivers precisely that. Provide real-time support, instantly address queries, and keep your audience engaged no matter where they are.

Beyond speed, mobile apps unlock countless opportunities for meaningful interaction. From personalized offers and timely notifications to seamless direct communication, your app transforms how customers connect with your business.

Be Unique
In today’s digital world, attention is the most valuable currency.
A well-designed mobile app gives your business a direct line to your customers, capturing their attention and keeping it. But it’s not just about grabbing attention; it’s about holding it with a seamless, user-focused experience.

High-quality, intuitive apps build trust, encourage repeat engagement, and foster lasting customer loyalty.

All the Analytics in One Place
With a mobile app, you can gather valuable insights — from user feedback to behaviour and preferences.
This kind of data is gold when used effectively. It helps you make smarter decisions, tailor your services, and continuously improve the customer experience.
Mobile Marketing Costs are Lower
Mobile marketing is more cost-effective than traditional methods,
allowing you to reach your audience directly and efficiently. By lowering overall marketing expenses, you can reallocate resources to other key areas of your business — whether that’s product development, customer service, or growth initiatives.

PROTOTYPE

At this stage, we focus on building a Minimum Viable Product (MVP) — a lean version of your app that includes only the core features needed to solve your users’ primary problem.

But we don’t stop at functionality — we combine it with UX-first design thinking to ensure the prototype is intuitive, engaging, and user-friendly. This helps us validate the concept quickly, gather meaningful feedback from early users, and make smart, informed decisions before full-scale development.

What this includes:

  • Core feature implementation to test the idea with real users
  • Interactive prototypes that simulate real app usage
  • UX-focused design to optimize user flow and usability
  • Feedback loops to capture insights and refine the product early

This is where vision meets reality — without overbuilding or overspending.

CODE

Once the MVP prototype is validated, we move into full-scale development — turning design and strategy into a fully functional mobile application.

Our development team follows best practices in clean, scalable coding to ensure your app runs smoothly, securely, and efficiently across all target platforms. Whether it’s iOS, Android, or cross-platform, we build with performance and long-term maintainability in mind.

What this includes:

  • Frontend & backend development using modern frameworks and technologies
  • Integration with APIs and third-party services
  • Robust database and server setup for scalability and performance
  • Rigorous version control and documentation for clarity and collaboration
  • Ongoing communication and milestone reviews to keep you in the loop
    This is where your product comes to life — feature-rich, fast, and ready to scale.

DELIVERY

Once development and testing are complete, we prepare your app for launch — ensuring it meets all technical and compliance requirements for the platforms you’ve chosen.

Whether you need an app for iOS, Android, or both, we handle the full submission and deployment process. Our team ensures a smooth handover, with all code, assets, and documentation delivered professionally and securely.

What this includes:

  • Platform-specific deployment to the Apple App Store and/or Google Play
  • Final app optimization for speed, size, and compatibility
  • Compliance with App Store/Play Store guidelines
  • Support during the approval process (including responding to any reviewer feedback)
  • Delivery of source code and technical documentation
  • Optional post-launch support & updates

Why Choose Justapplications For Custom Mobile App Development

Wide Range of Technologies

We continuously enhance our expertise and skills to deliver not only cutting-edge technology but also user-friendly, scalable, and secure custom mobile applications tailored to your needs. Our proficiency spans the leading development languages, including:

  • For Native Android: Kotlin (the modern, preferred choice) and Java (robust and widely used).
  • For Native iOS: Swift (Apple’s powerful and intuitive language).
  • For Cross-Platform Excellence: Dart with Flutter (for beautiful, high-performance apps from a single codebase) and JavaScript with React Native (leveraging web development skills for native-like experiences).

Communication Throughout the Project

Effective communication is the cornerstone of every successful project. That’s why we prioritise a well-structured schedule of regular calls and meetings. Having release milestones is key to ensuring the delivery is aligned with your business goals, as well as keeping you fully engaged throughout the entire development process.

Commitment & Ambition

Whether collaborating closely with you or working independently, we approach every project with a strong sense of responsibility and a drive to exceed expectations.

Flexible Time & Materials Approach

Our time & materials model allows us to remain adaptable and responsive to your feedback. Flexible coding, working hours, methodologies, and ongoing support are not just principles — they’re the foundation of how we work.

Agile Development

Our team follows Agile best practices, including regular SCRUM events, to continuously optimize processes and deliver increasingly higher quality in every stage of mobile app development.

Complete Transparency

Clients trust us because we champion complete transparency throughout the entire app development journey. We believe you should have full visibility into your project, which is why you can monitor progress in real-time and access all of your code via GitHub. There are no hidden features, no unexpected changes, just a straightforward development process that keeps you in the loop every step of the way. This open approach ensures peace of mind and builds lasting partnerships.

We don’t just say we don’t believe in project creep, we actively prevent it! Our meticulous planning and transparent development process are designed to keep your project firmly on track, within scope, and on budget. We ensure your vision is realised efficiently, without unexpected additions or delays.

iOS

We specialise in crafting custom, on-demand applications that perform flawlessly across the entire Apple ecosystem. As a full-service mobile app development agency, we offer end-to-end solutions — from building powerful native iOS apps to seamlessly porting existing applications to new platforms. What’s more, we can also handle the entire launch process onto the App Store for you, ensuring your application reaches your audience smoothly and effectively.

React Native

While we are proficient across a wide range of mobile technologies, React Native is our preferred language for accelerating mobile app development. This powerful technology allows us to leverage a shared codebase, saving significant time and resources for both you and our team.

By using React Native, we efficiently build high-performance, cross-platform applications that run seamlessly on both iOS and Android. The best part? These apps deliver a truly native-like experience, offering the smooth performance and intuitive interfaces that are often indistinguishable from fully native applications.

Ultimately, the choice is yours. We’re always open to discussing your specific needs and can adapt to other development languages to ensure your app perfectly aligns with your unique vision and goals.

Android

Integrating native mobile features into your business is key to unlocking its full potential, and Android offers compelling advantages.

While both iOS and Android platforms have their nuances, Android can often present a more straightforward path to development, particularly when considering its open-source nature and robust developer community. This can sometimes translate to more efficient development cycles for certain functionalities.

However, Android’s most significant strength lies in its vast and rapidly growing global user base. With billions of devices worldwide, choosing Android means you’re tapping into an incredibly diverse and expansive market. This makes it a crucial platform for maximizing your reach and ensuring your app connects with the broadest possible audience.

By leveraging Android’s capabilities, your business can deploy powerful, natively integrated mobile solutions designed to engage this enormous user base, drive growth, and solidify your market presence.

Justapplications cases as a mobile App Development company 

Case

Ad-Lister Software

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Ad-Lister is a listing software tool built in 2006 by Just Applications Ltd. Ad-Lister stands out as a powerful online listing management tool, placing a primary focus on product management and listing. Seamlessly integrating with popular e-commerce platforms such as Magento, WooCommerce, Shopify, Bigcommerce, eBay, Etsy, ManoMano, B&Q, TikTok and Amazon, Ad-Lister streamlines the process of product synchronisation.

Case

Nventree Multi-Channel Management

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Nventree can manage your stock and inventory across multiple platforms. When an order enters the system, stock is adjusted and updated on every platform. It is possible to filter by platform to easily see what you are selling and where. In addition to this, Nventree has the ability to bulk update stocks manually, as well as, export a stocks report to CSV. Link Nventree with eBay, Amazon, and some of the most popular shopping carts, such as Magento, WooCommerce, Shopify and more.

FAQ

What's the Investment for Your Mobile App?

The cost to develop a mobile app is tailored to your unique project, influenced by factors such as:

  • App Complexity: The number and intricacy of features.
  • Platform(s): Whether you need iOS, Android, or a cross-platform solution.
  • Design Requirements: The level of custom UI/UX design.
  • Backend Integrations: Connections to databases, APIs, or other systems.

While a simpler app might start from around £12,000, feature-rich and highly customized solutions will naturally require a higher investment.

We believe in complete transparency and clarity. That’s why we prefer to charge per project, providing you with the full, upfront cost before development even begins. We work closely with you to craft a detailed development plan that aligns perfectly with both your budget and your business goals, ensuring no hidden surprises.

Do We Provide "Finger in the Air" Quotes?

Yes, we absolutely can give you an initial estimate! We’re experienced at providing a realistic ballpark figure to help you quickly understand the potential investment.

However, much like you wouldn’t build a house without proper architectural drawings, we strongly recommend a discovery phase for mobile app development. This crucial step results in a detailed feasibility proposal that outlines the project scope, technical roadmap, and a precise cost.

There’s a small charge for this in-depth discovery, but should you decide to proceed with the development, this cost will be fully credited towards your final project invoice. It’s an investment that ensures clarity, prevents surprises, and sets your app up for guaranteed success.

How Long Does It Take to Build a Mobile App?

The timeline for mobile app development is truly bespoke, depending entirely on your app’s complexity, features, and overall scope.

Typically:

  • A basic Minimum Viable Product (MVP), designed to launch quickly and test your core concept, usually takes 6-12 weeks.
  • A fully-featured, custom mobile application with advanced functionalities, integrations, and sophisticated UI/UX will naturally require a longer period, often ranging from several months or more to ensure quality and comprehensive delivery.

We understand that business needs evolve. That’s why we often recommend a phased approach, allowing us to continuously develop and iterate on your app. This ensures you’re always in charge of future updates and enhancements, keeping your app relevant and competitive.

To manage these timelines effectively and ensure flexibility, we exclusively use Agile methodologies. This means we deliver iterative updates in consistent cycles, ensuring timely progress, complete transparency, and the ability to adapt to changes as your vision takes shape. We’ll work closely with you at every stage to define a realistic timeline that aligns with your market goals.

Native, Cross-Platform, or Hybrid: Which App Type is Right for You?

Choosing the right development approach is critical for your app’s success. We’ll help you navigate the options of Native, Cross-Platform, and Hybrid apps, considering your budget, timeline, desired performance, and specific feature needs.

 

     1. Native Apps

  • What they are: Built specifically for a single operating system using its dedicated programming languages (e.g., Swift for iOS, Kotlin/Java for Android) and development tools.
  • Pros:
    • Unmatched Performance: Deliver the fastest, most fluid user experience.
    • Full Device Integration: Seamless access to all device features (camera, GPS, sensors, push notifications, etc.) and the latest OS functionalities as soon as they’re released.
    • Optimal User Experience (UX): Adhere perfectly to platform-specific design guidelines, providing a familiar and intuitive feel for users.
    • Highest Security: Leverage built-in platform security features.
  • Cons:
    • Higher Development Cost & Time: Requires separate development teams and codebases for iOS and Android, increasing both expenses and time to market.
    • More Complex Maintenance: Updates and bug fixes need to be applied to each platform’s codebase individually.
  • Best for: Apps requiring intensive graphics, complex animations, high performance (e.g., gaming, advanced mapping), deep hardware integration, or a truly bespoke user experience on each platform.

     

2. Cross-Platform Apps

  • What they are: Developed using frameworks (like React Native, Flutter) that allow a single codebase to be used to build apps for both iOS and Android. These frameworks compile to native code or use high-performance rendering engines.
  • Pros:
    • Faster Development & Time-to-Market: “Write once, run anywhere” philosophy significantly reduces development time and resources.
    • Cost-Effective: A single codebase means lower development and maintenance costs compared to native.
    • Native-Like Experience: Modern frameworks offer excellent performance and can often deliver a UI/UX that is nearly indistinguishable from native apps.
    • Broader Audience Reach: Launch on both major platforms simultaneously.
  • Cons:
    • Potential Performance Trade-offs: While excellent, they might not always match the absolute peak performance of highly optimized native apps, especially for very resource-intensive tasks.
    • Limited Access to Latest Features: Access to brand new OS features or obscure hardware capabilities might be delayed until the framework updates its support.
    • Framework Dependency: Reliance on the chosen framework’s ecosystem and updates.
  • Best for: Most business applications, e-commerce, social media, content-heavy apps, or MVPs where speed to market and cost efficiency are key, without sacrificing significant performance or native feel.

     

3. Hybrid Apps

  • What they are: Essentially web applications (built with HTML, CSS, JavaScript) encased in a thin native “shell” or “wrapper.” They run inside a WebView component within the native app.
  • Pros:
    • Rapid Development & Lowest Cost: Leverage existing web development skills and a single codebase for extremely fast deployment.
    • Broad Reach: Can run on any platform with a web browser.
    • Simple Updates: Often, changes to the web code can be pushed without requiring an app store update.
  • Cons:
    • Performance Limitations: Can be noticeably slower and less responsive than native or even cross-platform apps, especially with complex interactions or animations, as they rely on a browser engine.
    • Non-Native Feel: The UI/UX might not perfectly match native guidelines, potentially leading to a less intuitive or consistent user experience.
    • Limited Device Access: Access to hardware features often relies on plugins, which might not cover all functionalities or be updated as quickly.
    • Debugging Challenges: Can be more complex to debug issues that arise from the interaction between the web content and the native wrapper.
  • Best for: Simple content-driven apps, internal business tools, or apps where an existing web presence can be easily wrapped, and performance/native feel is less critical than speed and budget.

Our Recommendation:

While we are experts in all three approaches and are always open to discussing your specific needs, we often lean towards Cross-Platform frameworks like React Native for most projects. This allows us to provide a fantastic native-like user experience with the efficiency of a single codebase, delivering exceptional value and faster time-to-market. We’ll work closely with you to determine the optimal strategy that best aligns with your vision, budget, and long-term goals.

 
How Do You Ensure the App Meets My Business Goals?

Ensuring your app delivers tangible business value is at the core of our approach. We don’t just build apps; we craft strategic solutions designed to meet and exceed your objectives. Here’s how we guarantee alignment:

1. In-depth Discovery Phase: As you mentioned, everything begins with a comprehensive discovery phase. This isn’t just a brief chat; it’s a deep dive where we meticulously understand:
    • Your Target Audience: Who are your users, what are their needs, and how will the app solve their problems?
    • Your Core Business Objectives: What specific outcomes are you aiming for? (e.g., increased sales, improved efficiency, enhanced customer loyalty, new revenue streams).
    • Key Features & Functionalities: What features are essential to achieve those objectives and provide real user value?
    • Market Landscape & Competitors: How will your app stand out and capture market share?
  1. Clear & Consistent Communication: We maintain an open channel throughout the entire project. Regular calls and meetings ensure all stakeholders are always informed, aligned with the evolving business goals, and fully engaged in the process.
  2. Collaborative Feedback Loops: Your insights are invaluable. We actively involve you in continuous feedback loops at every critical stage. This ensures your vision remains central and allows for agile adjustments based on real-time input.
  3. Milestone Test Releases: We implement a structured approach to testing. Through platforms like TestFlight (for iOS) and Google Play’s internal testing tracks (for Android), we provide you with access to early, functional versions of your app at key milestones. This allows you to experience the app firsthand, provide practical feedback, and ensure features are developing exactly as intended, long before final launch.
  4. User-Centric Design & Experience (UI/UX) Focus: Our design philosophy always revolves around the end-user. By prioritizing intuitive user interfaces and seamless user experiences, we ensure the app is not just functional, but also delightful to use, thereby maximizing adoption and engagement.
  5. Strategic Post-Launch Support & Iteration (Optional): Our commitment doesn’t necessarily end at launch. For ongoing success, we can work with you on a phased approach, continuously monitoring performance, gathering user feedback, and planning future updates to ensure the app evolves with your business and market demands.

By integrating these steps, we ensure the final product isn’t just a well-built app, but a powerful tool that directly drives real, measurable value for your business.

justapplications
★ ★ ★ ★ ★ Top mobile app developers 2021

What Our Clients Say

“Fantastic company! Excellent communication! Quality work! I have been with the company for the past 10 years and will continue to use their services. Cannot rate highly enough!”

– Graham Brogden

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Remember, we are here to turn your ideas into reality!