Top iPhone App Development Companies in the United Kingdom
From London’s fintech corridor to Cambridge and Oxford’s research hubs, the United Kingdom is a standout market for iPhone app development. UK agencies bring deep iOS expertise, product strategy, and compliance know-how for regulated sectors like finance and health.
On Clutch, you can compare vetted partners by verified client reviews, portfolios, industry focus, and pricing—making it easier to find the right team for native Swift/SwiftUI builds, integrations, and ongoing support. Use filters for budget, location, industry, and platform to zero in on the best fit, whether you’re in London, Manchester, Edinburgh, or beyond. If you’re ready to hire iPhone app developers in the UK, start here and refine by specialties like AI, payments, or accessibility. Explore these additional directories:
• Top iPhone App Development Companies
• iPhone App Development Companies in London
• iPhone App Development Companies in Birmingham
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$10,000+Undisclosed1,000 - 9,999Birmingham, England
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See all 82 projectsChetu, Inc. is a versatile application development company specializing in Mobile App Development and related services, including iOS and Android Development. Reviews from clients highlight their professionalism and effective project management, with 70% of clients praising their responsiveness and collaborative approach. However, 20% of feedback reflects issues with project delays and communication. Chetu’s commitment to customer success is frequently noted, though some clients express concerns about intellectual property management.
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$100,000+$150 - $199 / hr10 - 49Leeds, England
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See all 6 projectsPocketworks is a Mobile App Development company specializing in creating tailored solutions for diverse industries. With positive feedback from 100% of reviewers, Pocketworks is praised for their clear communication, strong project management, and innovative approach to Mobile Application Development. Clients highlight their dedication, flexibility, and ability to deliver complex projects on time, making them a reliable partner for iOS and Android Development needs.
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$100,000+$100 - $149 / hr250 - 999Edinburgh, Scotland
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See all 5 projectsCreateFuture is a proficient company specializing in Mobile App Development, known for effectively transforming business processes through their expertise in mobile software engineering. Their clients praise their ability to quickly understand business needs, with 100% positive feedback highlighting their skill in communication and collaborative project management. Notably, their projects are consistently delivered on time and within budget, demonstrating a commitment to excellence and customer satisfaction.
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$25,000+$25 - $49 / hr50 - 249London, England
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See all 34 projectsdotcode, a proficient application development company, specializes in mobile and web development, consistently delivering projects on time and within budget. With 100% of reviewers noting their effective project management and responsiveness, dotcode is praised for balancing technical expertise with an understanding of client needs, resulting in enhanced user experiences and increased engagement. Their comprehensive service offerings include UI/UX design, digital marketing, and ongoing support, ensuring client satisfaction and successful outcomes.
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$10,000+< $25 / hr50 - 249Exeter, England
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See all 9 projectsEVOQINS is a Mobile App Development company renowned for their expertise in creating investment management products within the fintech domain. Reviewers highlight their effective project management and commitment to deadlines, with 100% of feedback underscoring their partnership approach, flexibility, and collaborative ethos. While quality improvements were noted, clients appreciate their deep industry knowledge and proactive communication.
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$10,000+$25 - $49 / hr50 - 249London, England
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See all 9 projectsScrums.com is a mobile app development company renowned for delivering tailored solutions with a focus on quality and innovation. They consistently impress clients with their ability to meet specific needs, maintain timelines, and enhance operational efficiency. A remarkable 100% of reviews highlight their exemplary project management and ability to exceed expectations in both Android and iOS development projects.
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$25,000+$50 - $99 / hr10 - 49London, England
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See all 10 projectsRed C London is a distinguished mobile app development company, specializing in both iOS and Android development, known for its ability to deliver complex projects within budgetary constraints. Reviewers praise Red C for their exceptional project management and responsiveness, with 100% positively noting their flexibility and collaborative approach. Many clients highlight their budget control and the ability to deliver high-quality applications that meet specific end-user needs, including niche markets and innovative features.
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$5,000+$100 - $149 / hr2 - 9London, England
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See all 38 projectsFortnight is a distinguished Mobile App Development company known for its expertise in iOS and Android Development, offering services such as UI/UX design and cross-platform application development. The company receives overwhelmingly positive feedback, with 100% of reviewers highlighting their exceptional project management skills and commitment to delivering high-quality applications on time and within budget. Their ability to translate client ideas into functional and user-friendly apps is frequently praised.
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$5,000+$50 - $99 / hr10 - 49Farnham, England
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See all 3 projectsAppy Ventures specializes in Mobile App Development, offering both iOS and Android Development services. Clients commend their excellent project management, adherence to timelines, and impressive productivity. Overall, reviews highlight their ability to deliver high-quality applications without bugs or crashes, ensuring a smooth development process.
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$1,000+$25 - $49 / hr250 - 999Leeds, England
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See all 6 projectsAppsNation is a versatile mobile app development company excelling in Android and iOS development, known for its expertise in creating innovative healthcare and gaming applications. Reviews highlight a 100% satisfaction rate, emphasizing their exceptional project management, timely delivery, and ability to integrate cutting-edge technology with user-friendly design. Clients appreciate their creativity and adaptability, with only minor suggestions for improvement, such as enhancing customization options and documentation.
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$10,000+$50 - $99 / hr2 - 9Bristol, England
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See all 6 projectsBlue Sparrow is a proficient Mobile App Development company specializing in creating iOS and Android applications tailored to client needs. Across various reviews, clients commend their exceptional project management, communication, and collaborative problem-solving skills. With a high satisfaction rate, evidenced by consistently positive feedback, Blue Sparrow is noted for their ability to integrate client visions into functional, user-friendly apps, with no significant areas for improvement identified.
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$10,000+$25 - $49 / hr50 - 249Manchester, England
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See all 52 projectsIntelivita is a mobile app development company known for delivering robust and user-friendly applications. Reviews indicate high satisfaction with 90% of clients highlighting their professionalism, responsiveness, and technical expertise. Clients appreciate their ability to transform ideas into functional apps for iOS and Android, with 70% mentioning their effective project management and adaptability to evolving requirements.
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$5,000+$25 - $49 / hr50 - 249London, England
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See all 27 projectsProtocloud Technologies Pvt. Ltd. is a company specializing in mobile app development and eCommerce solutions, consistently praised for meeting deadlines and providing great value. Approximately 75% of reviewers commend their project management and communication, though some suggest improvements in follow-up and transparency during projects. Their expertise in app development and emphasis on understanding client needs are frequently highlighted.
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$10,000+Undisclosed250 - 999Hampshire, England
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See all 66 projectsCommunication Crafts is a mobile app development company specializing in both iOS and Android platforms. The reviews are overwhelmingly positive, with 100% of reviewers noting their professionalism and efficiency. Clients commend their capacity to deliver turnkey projects, timely delivery, and strong project management skills. Numerous reviews highlight their ability to exceed expectations and maintain robust client relationships.
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$10,000+$50 - $99 / hr50 - 249London, England
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See all 11 projectsLimeup is a company specializing in web application design, with a notable focus on creating mobile-friendly apps with simple user experiences. The overall feedback from their reviews is highly positive, highlighting their proactive communication and transparency, with 100% of reviewers impressed by their project outcomes. While their pricing could be improved, it is generally acceptable given their capability in delivering quality results.
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$10,000+$100 - $149 / hr10 - 49London, England
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See all 23 projectsCoreblue is a Mobile App Development company known for its expertise in iOS and Android applications. Clients consistently highlight their consultative approach and effective communication, with 100% positive feedback on project management and delivery. Coreblue excels in ensuring alignment with commercial objectives and maintaining high technical standards across all projects.
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$25,000+$50 - $99 / hr50 - 249London, England
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See all 17 projectsApplifting, a Mobile App Development company, is praised for its efficiency and expertise in mobile software engineering, particularly in rewriting apps into the Flutter framework. Their reviews are overwhelmingly positive, with 100% of clients noting improved app performance and user feedback. Clients appreciate their autonomy, goal-driven approach, and strong communication skills, though some desire more peer-reviewed decisions.
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$10,000+$100 - $149 / hr2 - 9London, England
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See all 17 projectsBinary Mango is a proficient mobile application development company, providing services in iOS and Android development. The company's clientele consistently praises them for their professionalism, innovative solutions, and responsiveness. Over 90% of reviews highlight their effective communication and ability to deliver projects ahead of schedule. Clients laud their creativity and technical expertise in transforming ideas into high-quality mobile applications.
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$10,000+$50 - $99 / hr10 - 49Bedford, England
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See all 4 projectsUnity Developers is a Mobile App Development company specializing in iOS and Android Application Development, with a strong focus on Augmented Reality and educational gaming apps. Across reviews, 100% of clients praise their timely delivery, technical expertise, and excellent communication, highlighting their ability to align with client goals and deliver high-quality, innovative solutions.
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$50,000+$50 - $99 / hr10 - 49London, England
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See all 17 projectsBlank Space is a mobile app development company specializing in creating custom mobile applications for iOS and Android platforms. They are praised for their excellent project management and communication, with 100% of reviewers noting satisfaction with their customer service and technical execution. Their ability to translate client visions into reality and maintain strong client relationships is consistently highlighted across testimonials.
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Undisclosed$50 - $99 / hr250 - 999London, England
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See all 15 projectsHolycode, a Mobile App Development company, has received overwhelmingly positive feedback, with 100% of reviewers appreciating their professionalism and dedicated project management. Clients commend Holycode for their clear communication and strong alignment with project goals, establishing a trusted partnership for Mobile Software Development endeavors.
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$50,000+$100 - $149 / hr50 - 249Belfast, Northern Ireland
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See all 11 projectsInstil is a software development company specializing in Mobile App Development, including Android and iOS platforms. Reviews highlight their exceptional expertise, professionalism, and dedication to quality, with 100% positive feedback emphasizing their commitment to client success and knowledge transfer. Clients praise their flexibility and high-quality software solutions, noting their ability to deliver projects on time and within budget.
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$5,000+$50 - $99 / hr10 - 49London, England
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See all 12 projectsAppy Monkey is a Mobile App Development company known for its comprehensive approach to application development for both iOS and Android platforms. The reviews highlight their strong project management, effective communication, and ability to deliver on time and within budget. Approximately 100% of the feedback is positive, with many clients praising their problem-solving skills and proactive approach to project development.
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Undisclosed$50 - $99 / hr1,000 - 9,999London, England
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See all 4 projectsIntive, a mobile application development company, offers services in Android and iOS development. Overall, their reviews indicate a strong ability to scale teams effectively and meet project goals, despite occasional aggressive timeframes. Approximately 80% of reviewers praise their responsiveness and local resource availability, while 20% suggest improvements in planning and lead time.
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$10,000+$50 - $99 / hr10 - 49Manchester, England
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See all 14 projectsForesight Mobile is a Mobile App Development company specializing in crafting custom applications, notably utilizing Flutter technology. With a strong reputation for professionalism and clear communication, 100% of reviewers commend their project management capabilities, transparency, and responsiveness. Clients frequently highlight their ability to deliver apps on time, within budget, and to a high standard, establishing themselves as a reliable partner in Mobile Software Development.
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$5,000+< $25 / hr50 - 249LONDON, England
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See all 25 projectsZOONDIA is a proficient Mobile App Development company, excelling in iOS and Android development. The company receives overwhelmingly positive feedback, with around 95% of clients praising their project management, technical expertise, and responsiveness. Clients commend their innovative solutions and professionalism, although some suggest improvement in pricing strategies. ZOONDIA emerges as a reliable partner for developing robust and secure applications, offering comprehensive support and excellent customer service.
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$10,000+$25 - $49 / hr10 - 49London, England
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See all 17 projects5StarDesigners Ltd. is a proficient mobile app development company excelling in both iOS and Android platforms. The reviews highlight their commendable project management, timely deliveries, and collaborative approach, with over 90% of feedback emphasizing their effective communication and innovative solutions. Clients appreciate their ability to offer cost-effective services while ensuring a user-friendly interface and advanced functionalities.
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$10,000+$25 - $49 / hr50 - 249London, England
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See all 38 projectsEmvigo Technologies Ltd is a Mobile Application Development company highly praised for its professionalism, flexibility, and effective communication. With a focus on creating mobile apps for both iOS and Android platforms, they have received overwhelmingly positive feedback, with 100% of reviewers expressing satisfaction with their project management and delivery. Emvigo’s strengths include their ability to align with client needs and deliver high-quality, innovative solutions.
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$10,000+$25 - $49 / hr50 - 249London, England
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See all 35 projectsNimblechapps Pvt. Ltd. is a mobile app development company specializing in iOS and Android applications, delivering quality products on time and within budget. With approximately 87% of reviews praising their project management and communication skills, clients appreciate their ability to meet deadlines and adapt to project needs. However, one review indicated issues with contract adherence, highlighting an area for potential improvement.
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$250,000+$150 - $199 / hr50 - 249London, England
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See all 30 projectsWaracle is a mobile app development company specializing in iOS and Android development. They are praised for their expertise in app development, with over 80% of reviewers highlighting their professionalism and technical skills. Clients commend their flexibility and ability to manage projects effectively, ensuring timely delivery and quick resolution of issues. While some feedback suggests room for improvement in post-implementation services, overall, 90% of feedback is positive, emphasizing Waracle's dedication to understanding client needs and delivering high-quality mobile applications.
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$10,000+$25 - $49 / hr50 - 249London, England
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See all 4 projectsMOHARA is a mobile app development company known for its competence in updating and supporting brownfield applications. The company excels in communication and technical understanding, delivering projects on time and within budget. Approximately 100% of the feedback highlights their effective project management, timely updates, and quick resolution of issues, making them a reliable choice for mobile software development.
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$50,000+$100 - $149 / hr50 - 249London, England
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See all 8 projectsNovoda is a distinguished mobile app development company with a focus on Android and iOS development. Their expertise is evident in their ability to deliver high-quality, reliable applications, as noted by 100% of reviewers who highlight their proficiency and passion for mobile software development. Clients praise Novoda for their professionalism, seamless project management, and collaborative approach, making them an ideal partner for complex mobile application projects.
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$25,000+$100 - $149 / hr10 - 49Leeds, England
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See all 15 projectsEden Agency - Out of Business was a proficient Mobile App Development firm excelling in iOS and Android development. Their services were consistently praised for technical ability, communication, and innovative solutions. From the reviews, 100% of clients applauded their expertise in managing complex projects, while notable satisfaction was expressed with their creativity and seamless project management.
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$50,000+Undisclosed10 - 49Edinburgh, Scotland
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See all 23 projectsZudu is a mobile app development company specializing in creating bespoke applications for iOS and Android platforms. Reviews highlight their strong project management skills, effective communication, and personalized customer care, with consistent on-time delivery and high satisfaction levels. Approximately 90% of feedback emphasizes their professionalism, adaptability, and technical expertise, while only a few suggest the need for forward planning.
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$50,000+$100 - $149 / hr10 - 49Manchester, England
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See all 9 projectsIndiespring is a prominent mobile app development company specializing in iOS and Android platforms, offering services such as app maintenance, strategy, and integration with other systems. Across their reviews, 100% of clients commend their flexibility, communication, and technical expertise. Notably, 80% of reviewers highlight their proactive project management and ability to meet deadlines consistently, ensuring successful project delivery.
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List of the Top 15 United Kingdom iPhone and iOS App Development Companies
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$25,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
39.2/40.019.2/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
40% Mobile App Development40% iPhone iOS App Development60% Other -
$5,000+$25 - $49 / hr50 - 249London, England
Ability to deliver
38.4/40.018.8/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
50% Mobile App Development50% iPhone iOS App Development50% Other -
$10,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
40% Mobile App Development25% iPhone iOS App Development60% Other -
$50,000+$150 - $199 / hr250 - 999London, England
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
20% Mobile App Development40% iPhone iOS App Development80% Other -
$5,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
39.8/40.020/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
58% Mobile App Development20% iPhone iOS App Development42% Other -
$100,000+$100 - $149 / hr50 - 249Newcastle upon Tyne, England
Ability to deliver
36.6/40.016.8/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
50% Mobile App Development50% iPhone iOS App Development50% Other -
$25,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
37/40.017.2/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
40% Mobile App Development30% iPhone iOS App Development60% Other -
$25,000+$25 - $49 / hr10 - 49London, England
Ability to deliver
36.2/40.016.6/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
100% Mobile App Development70% iPhone iOS App Development -
$5,000+$25 - $49 / hr50 - 249Winchester, England
Ability to deliver
38.1/40.018.6/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
35% Mobile App Development60% iPhone iOS App Development65% Other -
$50,000+$50 - $99 / hr1,000 - 9,999London, England
Ability to deliver
39.8/40.020/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
10% Mobile App Development50% iPhone iOS App Development90% Other -
$10,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
38.8/40.019.8/20 Reviews9.8/10 Clients & Experience9.2/10 Market PresenceService focus
30% Mobile App Development20% iPhone iOS App Development70% Other -
$100,000+$100 - $149 / hr250 - 999Salford, England
Ability to deliver
35.5/40.015.6/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
60% Mobile App Development40% iPhone iOS App Development40% Other -
$25,000+$50 - $99 / hr50 - 249London, England
Ability to deliver
39.5/40.020/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
60% Mobile App Development20% iPhone iOS App Development40% Other -
$25,000+$50 - $99 / hr250 - 999London, England
Ability to deliver
36/40.016.2/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
50% Mobile App Development30% iPhone iOS App Development50% Other -
$50,000+$25 - $49 / hr1,000 - 9,999London, England
Ability to deliver
36.6/40.016.8/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
20% Mobile App Development40% iPhone iOS App Development80% Other -
$1,000+< $25 / hr50 - 249Hertfordshire, England
Ability to deliver
39.3/40.020/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
35% Mobile App Development35% iPhone iOS App Development65% Other -
$25,000+$25 - $49 / hr1,000 - 9,999London, England
Ability to deliver
36.4/40.016.6/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
20% Mobile App Development30% iPhone iOS App Development80% Other -
$1,000+$25 - $49 / hr1,000 - 9,999London, England
Ability to deliver
37.4/40.018/20 Reviews9.6/10 Clients & Experience9.8/10 Market PresenceService focus
15% Mobile App Development25% iPhone iOS App Development85% Other -
$25,000+$25 - $49 / hr50 - 249Manchester, England
Ability to deliver
37.4/40.017.4/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
55% Mobile App Development30% iPhone iOS App Development45% Other -
$50,000+$100 - $149 / hr10 - 49Cardiff, Wales
Ability to deliver
35.5/40.016.4/20 Reviews10/10 Clients & Experience9.2/10 Market PresenceService focus
70% Mobile App Development50% iPhone iOS App Development30% Other -
$1,000+< $25 / hr1,000 - 9,999London, England
Ability to deliver
38.1/40.020/20 Reviews8.4/10 Clients & Experience9.7/10 Market PresenceService focus
10% Mobile App Development25% iPhone iOS App Development90% Other -
$50,000+$100 - $149 / hr10 - 49York, England
Ability to deliver
37/40.017.2/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
65% Mobile App Development30% iPhone iOS App Development35% Other -
$25,000+$100 - $149 / hr10 - 49Shoreham, England
Ability to deliver
35.9/40.016.4/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
80% Mobile App Development40% iPhone iOS App Development20% Other -
$25,000+< $25 / hr1,000 - 9,999London, England
Ability to deliver
37.6/40.017.8/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
10% Mobile App Development40% iPhone iOS App Development90% Other -
$10,000+< $25 / hr50 - 249London, England
Ability to deliver
39.6/40.019.6/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
25% Mobile App Development30% iPhone iOS App Development75% Other -
$100,000+$25 - $49 / hr50 - 249London, England
Ability to deliver
36.7/40.016.8/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
50% Mobile App Development25% iPhone iOS App Development50% Other -
$25,000+$50 - $99 / hr10 - 49York, England
Ability to deliver
35.1/40.015.8/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
60% Mobile App Development40% iPhone iOS App Development40% Other -
$25,000+$25 - $49 / hr50 - 249London, England
Ability to deliver
38.2/40.018.4/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
20% Mobile App Development40% iPhone iOS App Development80% Other -
$10,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
36.5/40.017.6/20 Reviews10/10 Clients & Experience8.9/10 Market PresenceService focus
15% Mobile App Development35% iPhone iOS App Development85% Other -
$10,000+$25 - $49 / hr250 - 999London, England
Ability to deliver
37.9/40.018.2/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
10% Mobile App Development30% iPhone iOS App Development90% Other
Latest iPhone App Development Articles
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How App Companies Can Build Trust with Customers
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UK iPhone App Development FAQs
UK agencies combine strong engineering talent with proximity to European markets and English-first communication. You’ll find specialization where it matters:
- London for fintech and enterprise-grade security
- Cambridge/Oxford for AI and health tech
- Manchester’s MediaCityUK for media and streaming
- Edinburgh for fintech/regtech.
Working locally also helps with UK GDPR compliance, accessibility (WCAG), and sector standards such as FCA guidance. For teams needing frequent workshops, in-person discovery, or long-term product partnerships, a UK-based team can reduce risk and accelerate delivery.
Pricing varies thanks to a range of factors, including city, complexity, and team seniority. You can expect UK-based iPhone app developers to charge:
- Hourly rates: typically £70 – £140 per hour. London boutiques and enterprise specialists may be higher; regional teams often offer £60 – £100.
- MVPs/prototypes: £25,000 – £60,000 for focused scopes.
- Growth-stage apps: £60,000 – £200,000+ for complex features.
- Enterprise/regulated builds: £150,000 – £500,000+ when security, audits, and compliance are in scope.
Ask agencies for a discovery estimate first—solid partners will validate requirements, create a roadmap, and provide phased budgets.
- Fintech and banking
- Health tech and life sciences
- Retail and e-commerce
- Media, sports, and gaming
- Travel and hospitality
- Public sector and education
If you need custom iPhone app development in the UK for a regulated domain, prioritize firms with relevant certifications, case studies, and security practices.
- Define scope and constraints — native iOS requirements, backend needs, timelines, compliance, and KPIs.
- Validate expertise — look for App Store links, recent Swift/SwiftUI work, and robust QA.
- Check credibility on Clutch — read verified reviews, assess industry focus, and similar project wins.
- Evaluate discovery and communication — ask how they handle product strategy, sprints, and stakeholder updates.
- Confirm long-term support — release management, ASO, analytics, and post-launch optimization.
If you’re comparing iOS application development services in the UK, align candidates to your industry and security needs before shortlisting.
- Vague estimates or skipping discovery before fixed pricing
- No live App Store examples or thin case studies
- Overpromising timelines (ignoring App Store review cycles and compliance work)
- Limited testing strategy or no performance/security plan
- Unclear IP ownership or data protection posture (UK GDPR)
- No plan for post-launch support, analytics, or release management
- One-size-fits-all proposals that ignore accessibility, localization, or integrations
These signals suggest risk. Prioritize partners who explain trade-offs, document assumptions, and tailor plans to your product and market.