Mobile App Development Agency for Business-Critical Applications
An award-winning, mobile app development and design agency in Kent-based with a London office, combining AI expertise with practical solutions to build AI-powered apps that solve operational challenges and drive business growth.
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Bespoke mobile app development that built around your business needs
chilliapple is your trusted web and mobile app development company in London, helping clients achieve key objectives with bespoke iOS and Android apps. We also empower businesses with React Native-based hybrid apps for greater client reach. Our team of UK AI app developers and designer works collaboratively with startups, rising companies, and brands, delivering successful, innovative digital solutions.
We deliver pioneering mobile apps with a focus on performance and efficiency, ensuring your application is easy to navigate, manage, and update post-launch. At chilliapple as an trusted app development agency in the UK, we excel in designing state-of-the-art digital apps. With steadfast dedication, we ensure that every project is deeply adapted to the client’s goals, fostering success and surpassing expectations.
Our mobile app development services
We deliver mobile application development services across the UK
End-to-end app development, from design and prototyping through to deployment and maintenance of your mobile application.
iOS App
Development
iOS powered devices are the second most popular in the world. With nearly 1.5 billion Apple active devices, chilliapple offers the opportunity to extend your customer access and their experience with its iOS app development service. [+]
Android App
Development
Android devices are currently the most popular globally. Using the latest resources and techniques, we deliver Google powered apps that work seamlessly across Android devices. [+]
React Native App
Development
Prefer one app that covers all the devices? We provide React Native powered, easy to manage hybrid apps for both iOS and Android. We use React Native to create cross-platform apps that look and feel like native apps. [+]
Hybrid App
Development
Hybrid application development uses the best of both native and web development technologies to bring your app to life on any mobile device. [+]
PWA
Development
Progressive Web App development is perfect for quick to market projects needing to cover multiple platforms with a single codebase. [+]
Flutter App
Development
Flutter is a mobile app development platform created by Google that allows developers to create web, desktop, and cross-platform apps that run on Android and iOS devices. [+]
Our featured work
Delivering measurable impact across industries, we help both established enterprises and ambitious startups achieve sustainable success.
We deploy an agile app development process
There isn’t a single fixed way to build every app. What we follow is a structured and agile approach that keeps things clear. We start by understanding what you’re trying to solve, then move into building and testing. We ensure the delivered mobile app fulfils key business goals.
This is where most of the clarity comes from. We look at how your business operates, what users actually need, and where the app fits in. We make sure we’re solving your key problems.
Instead of jumping straight into screens, we analyse how users will interact with the app. What do they do first? Where do they get stuck? This shapes the flows and the interface. So users can move through the app without confusion.
Development is handled with a focus on stability and flexibility. The choice between native and cross-platform isn’t forced; it depends on what suits the product. We keep the codebase clean and implement decisions that make future changes simple.
Issues are easier to fix when they’re found early. So testing isn’t left until the end. We check how the app behaves as it’s being built. We test the code across devices, under different conditions, to make sure it holds up after launch.
Releasing the app isn’t the finish line. It’s the point where real usage begins. Once it’s live, we keep an eye on how it performs and support fixes where needed. We also make improvements based on what users actually do.
Ready to build your mobile app?
From discovery to launch, we build scalable mobile apps around your business goals.AI powered app development
AI is changing how modern mobile apps are built and experienced. At chilliapple, we use AI both within our development workflows and inside the applications we create. We blend smart automation with personalized in-app features. Mobile apps feel more adaptive, efficient, and future-ready.
Smarter AI workflows
Our teams use AI-assisted development tools to speed up coding, automate repetitive tasks, identify issues earlier, and improve delivery efficiency. Every stage is still guided, reviewed, and validated by experienced developers.
Evolving UX
AI helps mobile apps understand user behaviour more effectively. From content recommendations to usage insights and engagement tracking, we build apps that continuously improve the customer experience over time.
AI functionalities
We build mobile apps with AI-powered capabilities such as chatbots, personalised recommendations, smart search, predictive suggestions, and workflow automation tailored to your business goals.
Your mobile app specialists
Since 2008, chilliapple has helped UK businesses design, develop, and improve mobile apps. Our experienced team will work with you at every stage, from shaping the initial idea and planning the app’s structure to designing the interface and building the final product. We've worked with businesses including RiskPal, Avatar, Doculift, STP Solutions and Jaguar Building Services, bringing practical technical expertise to projects with different requirements and challenges. On every project, we select our best-suited AI app developers based on your unique set of requirements. As a mobile app development agency in London, we aim to deliver your project on time and within the agreed budget, without sacrificing quality.
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Award Winning App Development Agency
chilliapple gives you a no nonsense approach to development. We don’t hide behind jargon and complicated project planning.
We promise to deliver the results your business needs at a fair price. There are no inflated prices or egos. Just a commitment to being masters of our craft. In fact, we win awards for app development performance and results rather than just for looking good.
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User Focused Design
Great design is key to a successful app. Our user experience (UX) designers will create an intuitive, easy-to-use app that makes sense for your business and your customers.
We take a design-led approach, creating user interfaces that are beautiful and easy to use.
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Competitive Costs
Developing a mobile app can be expensive, but it doesn't have to be. At chilliapple, we work with you to find the best solution for your budget and needs.
Prices are subject to complexity, however typically our mobile app development projects range in cost from £15k.
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Faster, Smarter Development with AI
With our agile approach, your mobile app is developed by experienced app developers who use AI-assisted tools to streamline coding, automate repetitive tasks and work on issue.
Regular updates and communication throughout the project ensure you are always up to date with the progress of your app.
What does it cost to build an app in the UK?
Mobile app development costs vary significantly by project. It is based on what you’re building and how it needs to perform. Most projects fall into three broad ranges.
Planning a new app or improving an existing one?
Speak with our team about the right approach with modern AI features.
What our clients say
We're just about to hit our 1 Year anniversary working with Chilli Apple and it seemed like a apt time to give feedback on our experience so far!
After years of struggling to get straight answers, waiting days for replies & solutions it was an absolute breath of fresh air to work with the Chilli-Apple team, specifically Jade & Lauren! [+]
Pentland Wholesaleopen
Chilliapple were fantastic with our project. With me not being the most technically minded, they managed to simplify everything and fully understand what we wanted whilst explaining the process and accurate timelines. Highly recommend.
Steven GentChilliapple accelerates company success Chilliapple have been the fuel in our companies engine for the past year by helping us to develop the signature product and get it launched. Avatar is ready for use thanks to Chilliapples tremendous technical delivery design and delivery process.
Jeff Nogosek Avatar
Their communication skills and ability to complete the project within budget and timescale were impressive.
After the launch of the website, the client received feedback from customers concerning a better UX, and Chilliapple Ltd. was able to update easier than before. They communicated through Campfire and had weekly updates through Zoom meetings. Overall, the team provided a good value for the budget.
Luisa Coates Thermapen
Good Knowledge of Magento: Chilliapple was recommended to us for their Magento knowledge which has proved to be excellent. We worked with Bowo and Vipin to migrate and upgrade our existing Magento shops to a new UK Fast server with additional features and plug ins installed resulting in a faster admin than we previously had. I would recommend Chilliapple for Magento especially multiple shops.
Steve Long Merlin Workwear
Great work with the team at Chilliapple. They undertook our website maintenance from a previous developer and they have managed to accommodate many of our initial needs, including an upgrade to Magento 2.4.
Since then, we have overcome many more requests to improve website and shopping functionality and while I personally will not be overseeing their work anymore, I trust though that Versapak are in safe hands and that they can meet any new challenge that may arise.
Jeremy Graham Versapak
I've worked with many web agencies in the past and ChilliApple certainly shine above the rest. Our account manager Bowo has been extremely attentive and pro-active, without whom we would not have been able to deploy our Magento 2 migration by the end of 2020.
We're very pleased at the hard work and patience that Bowo and the development team have put into this project, especially as we were working long hours towards the end. I look forward to continued work with ChilliApple in 2021!
Laura Lam Phoenix Medical
Our website is built in Prestashop, and finding credible developers to maintain and progress the site was very difficult once we had made the decision to move on from our current developer.
Chilli Apple initially upgraded and re-themed our site to a very high standard with excellent communication throughout. We went live with the update (which was quite a major undertaking as it had not been done for some time and a lot had changed) right at the beginning of the COVID fiasco. [+]
Kieron Miller Skirting4u
We have found the dedicated development service an excellent way to quickly expand our team and give complete flexibility.
Priya has been a great asset to the team and provided valuable knowledge and ability to resolve our development requirements.
Garth Hoggins UBT (EU) Ltd
We received a great customer service from ChilliApple. The team is very friendly and helpful. Highly recommended! Thanks to Nick, Seb, Vipin, Spencer and all the team!
Cedric Cleaningspot
Mobile app development FAQs
How much does it cost to develop an app in the London, UK ?
The cost to develop an app in the UK can vary depending on the features and complexity of the app. For apps development costs vary from £15k - £40K + (depending on the features and functionality required). However, at chilliapple, as an award-winning custom ai app development company we're committed to working within your budget to help you build a mobile application that meets your needs.
Can you develop a mobile app that integrates with our existing business systems?
Yes. We can securely integrate your app with CRMs, ERPs, databases, payment gateways, booking tools, and third-party APIs so data flows seamlessly between systems without manual re-entry or interruptions.
How long does it take to develop an app?
The time it takes to build a mobile app varies for every project. The timeline is in relation to the complexity and features of the app. Once a plan is in place, it can take anywhere from a week to a few 6 months or more to build a cross-platform app.
How do I choose the right mobile app development agency in the UK?
Choose an agency with relevant live app examples, in-house developers, clear pricing, strong security, and post-launch support. Check their reviews, meet the lead developer, confirm you own the code and IP, and then start with a small discovery phase.
I have an idea for an app. Can you help me make it a reality?
Yes! Our team of app developers can help you take your idea from the drawing board to the final version of your app. As an London's top app developer agency, we have experience in creating simple to complex apps for clients across a range of industries, so we can help you find the perfect solution for your business.
Can I hire mobile app developers for a project I'm working on?
Yes! If you need an app developer for at least a month, choosing from our dedicated team model is an excellent resource solution. Choosing to hire on a loan basis rather than as permanent employees will save you money in the long run. Find out more about the various models available to hire a mobile app developer in the UK here or just drop us a line to chat!
Do you provide app maintenance and app code review services?
Yes! We offer a range of application maintenance and support services to keep your apps running efficiently. This includes bug fixes, updates and changes to the user interface (UI) and user experience (UX). We can also provide advice and support on how to best improve your apps.
Can you build a mobile app with AI features in the UK?
Yes. At chilliapple, we build mobile apps with AI features that are designed around actual business use. That might include AI chatbots, voice-to-text features, personalised recommendations, workflow automation, or smarter search functionality inside the app. We work with OpenAI GPT-4o, Claude, and Gemini depending on what suits the project best.
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