Mobile App Development agencies for Startup.
Mobile App Development is the build of iOS and Android applications, native (Swift or Kotlin) or cross-platform (React Native, Flutter, or Capacitor), covering discovery, UX and UI design, engineering, QA on real devices, App Store and Google Play submission, and post-launch maintenance. It sits next to web development but answers to a different set of platform rules. This page shows every agency on AgencyIndex offering mobile app development for Startup.
- 12 UK agencies offering mobile app development for Startup
- Part of the Mobile App Development service set
- Indexed for Startup
- Reviewed 18 May 2026

We are a London-based digital product studio specialising in building and growing performant websites and digital products.

LION+MASON is a top-rated, strictly senior-led UK Digital Product Consultancy, specialising exclusively in the design, modernisation, and scaling of complex enterprise products and high-transaction platforms. Operating at the intersection of human-centred design and commercial strategy, the agency partners with global brands such as Johnson & Johnson, Best Western, and Cambridge University Press to drive scalable product growth and measurable business performance. Rejecting the traditional agency pyramid, LION+MASON connects clients directly with seasoned industry veterans and operates a unique, tech-agnostic "Architect Model"—remaining independent of the software engineering build phase to provide completely objective, best-fit technical partnerships without vendor lock-in. Consistently ranked by Clutch as one of the top UX Agencies in the UK and a leading global research firm, LION+MASON eschews traditional sales pitches in favour of a zero-barrier, free "Light Briefing," offering enterprise leaders immediate, expert perspective on how to bridge internal skill gaps, build competitive advantage, and architect market-leading digital products.

Zinc Digital of Northampton, UK, is a leading full-range digital agency renowned for its distinctive, collaborative method. Their strategic partnership with clients cultivates bespoke designs and plans that amplify each business's unique selling points (USPs), ensuring standout design and potent marketing. Their dedication to providing premium digital solutions is apparent in their extensive servi

SK is a global, full service marketing agency, with specialisms in financial services and technology. We support our clients in building and adapting marketing strategies for success. We deliver advertising, SEO & GEO, design, copy, email marketing, PR, research, strategic consulting, web design, CRM and data strategy, social media marketing and much more to act as an extension of your team. We ar

Softhunters delivers innovative IT solutions that drive digital transformation, helping businesses stay ahead through smart automation, streamlined operations, and cutting-edge technology. Our recent projects showcase our commitment to excellence, blending strategy with technology to unlock growth and success in the digital age.

Fourmeta Agency is an award-winning digital agency specializing in Shopify, ecommerce development, UX/UI design, branding, SaaS, AI product development, MVP development, mobile app development, and digital growth for ambitious brands worldwide.

Boost your local visibility with Google Business Profile optimization, SEO for small businesses, and responsive website development. We help businesses grow online with affordable SEO services, faster websites, and better Google rankings that bring in more local traffic and real leads.

Futurice, a leading digital transformation agency, hails from Finland. The agency distinguishes itself with an exceptional interdisciplinary methodology, merging top-tier technologists, strategists, and designers. They specialise in offering ground-breaking, quantifiable digital solutions spanning various sectors. Renowned for its swift outcomes and enduring influence, Futurice works in concert wi

SmallGiants, a London-based, comprehensive brand evolution and digital marketing agency, excels in crafting sturdy brand, marketing, and tech infrastructures that foster business growth and expansion. Uniquely, they offer services including full-funnel lead generation, data management frameworks, and vibrant brand identity development. Their acclaimed methodology is guided by insightful data, aimi

Catch, a London-based digital agency, is recognised for its proficiency in crafting superior digital experience platforms. This standout agency specialises in an all-encompassing range of services, including digital strategy, experience design, technology, and performance optimisation. Emphasising its dedication to accessibility and inclusion, Catch boasts team members such as Ann Pilbeam, who ard

NBT is a London-based growth-centric agency, with a global footprint stretching across Turkey, the UAE, Germany, Netherlands and Florida. With a unique ecosystem that bolsters business expansion through bespoke services such as growth strategy implementation and digital marketing, NBT sets itself apart. Our signature offerings like the Growth Academy and NBT Venture Studio equip businesses with th

Together is a bold, strategy-focused design and development agency headquartered in a confidential location. They excel in forging strategic alliances with premier B2B tech brands. Renowned for their innovative methodology, Together seamlessly transforms clients' aspirations into reality using state-of-the-art design and technology solutions. Their proficiency in remote partnerships, coupled with
AgencyIndex tracks 12 mobile app development agencies for Startup. The list above is filtered to that intersection and ordered with verified and featured listings first.
For the wider editor's view on mobile app development agencies in the UK, see the mobile app development service brief. For context on Startup as a sector, see the Startup industry brief. The pricing, timeline and red-flag notes below apply to mobile app development as a discipline; they do not change materially for Startup.
MVP / lean build £15,000-70,000 · Full production app £40,000-180,000 · Enterprise or regulated £150,000-500,000+. Capacitor / hybrid cheapest at £10,000-80,000. Maintenance retainers typically 15-20% of build cost per year.
Discovery 1-3wks · Design 2-6wks · Build 4-16+wks · QA on device matrix 1-4wks · App Store / Play submission 1-3wks (review 1-7 days). Complex enterprise builds run 6-12 months. Maintenance is ongoing.
- · Refusal to name the actual delivery team or disclose if work is being subcontracted offshore
- · QA done only on simulators with no real-device matrix across iOS and Android versions
- · No App Store Optimisation, no help with screenshots, metadata, privacy labels, or review rejections
- · No SLA on bug fixes, no warranty period, no defined severity levels in the contract
- · Proprietary backend or framework with no clear source code, infrastructure, or data ownership at handover
- · Cannot speak fluently about App Tracking Transparency, Google Play Data Safety, or EU DMA distribution rules
Mobile App Development agencies in other sectors.
Other services for Startup.
What brands ask about mobile app development agencies.
The 5 questions our editors get most often, answered honestly. These apply to mobile app development as a discipline across every industry.