Overview

About Stakk

Stakk is the UK's #1 mobile app development company, rated #1 on Goodfirms and based in London with over 10 years of experience building custom iOS apps, Android apps, and cross-platform mobile applications for startups and global enterprises.

We are a leading mobile app development agency specialising in React Native, Flutter, native iOS and Android development, and AI-powered mobile solutions. Our 100% in-house senior team has delivered 120+ mobile applications across marketplaces, fintech, healthcare, e-commerce, education, and enterprise sectors, with clients including Samsung, Nivoda, Safestyle, LNER, and the British Museum.

Our mobile app development services cover everything: UX design, native iOS and Android development, cross-platform development, backend engineering, API integration, QA testing, and full App Store and Google Play marketplace submission. Whatever stage you are at, we have done it before.

What sets Stakk apart is the quality and consistency of our delivery. We are AI-augmented, senior-led, and deeply collaborative. Our developers work directly with your team from day one, and we treat every project as if it were our own product.

Why businesses across the UK choose Stakk:

★ Rated #1 mobile app developer in the UK on Goodfirms
★ 100% in-house senior team, no outsourcing, no juniors
★ AI-augmented delivery, faster timelines, same quality
★ Direct access to developers from day one
★ Custom mobile app development tailored to your goals

"Their ability to craft high-quality code stands out." Andre, CTO at Nivoda

"They hit every deadline and even deliver early." Ben, Director at MyCoach

Looking for a mobile app development company in the UK? Tell us about your project and we will respond within one business day.

[email protected] | +44 20 3314 4040 | stakk.co.uk | 37 Lombard Street, 6th Floor, London, EC3V 9BQ

What clients say

Review Analytics of Stakk

Every review is verified through Goodfirms before it's published.

5.02 Verified Reviews
Quality5.0
Schedule & Timing5.0
Communication5.0
Overall5.0
Review Summary
Summarized from 2 verified reviews · Updated August 2026
Stakk delivered mobile apps that met or exceeded client expectations, with reviewers highlighting the team's professionalism, attention to detail, and proactive communication. Projects were completed on time with well-organized processes that felt smooth and predictable throughout. Clients noted the team's clear technical expertise and easy collaboration, with no sense of chaos or uncertainty in project management.
✦ AI-generated summary. May not reflect every review.
Detailed Reviews of Stakk
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What reviewers mention most

Anonymous
AnonymousVerified Review
Posted on Feb 13, 2026

Stakk delivered an excellent mobile app on time & exceeded our expectations throughout the project.

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App Development

We had a brilliant experience working with Stakk on our mobile app project. From the very start, the team took the time to properly understand our requirements and translated them into something we're genuinely proud of. They kept us informed at every stage, were quick to respond to any queries, and handled feedback professionally. The final product was delivered on schedule and to a very high standard. We wouldn't hesitate to work with them again.

Jack Patrick
Jack PatrickVerified Review
Posted on Feb 13, 2026

Seamless experience from start to finish, producing an app we're thoroughly pleased with.

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App Development

Stakk were fantastic to work with throughout the entirety of our mobile app project. The team came across as knowledgeable and confident from day one, which gave us a lot of reassurance early on. They managed the whole process really well, keeping us updated without us ever having to chase. The end result speaks for itself a well-built, polished app delivered exactly when promised. We'd have no hesitation recommending Stakk to anyone looking for reliable app development.

Focus

Service Focus of Stakk

How the team's effort is distributed across services.

80%

Industries Focus

35%35%30%

Client Focus

Small Business45%
Medium Business45%
Large Business10%
Selected Work

Client Portfolio of Stakk

Where their work concentrates - by industry, budget, and timeline.

Project Industry

Retail33%
Education33%
Entertainment33%
Major industry focus
Retail

Project Cost

$50001 to $10000067%
$100001 to $50000033%
Common project cost
$50001 to $100000

Project Timeline

1 to 25 Weeks100%
Typical timeline
1 to 25 Weeks

Clients: 7

LNERThe British MuseumSafestyleLaplandNivodaSothebysMyCoach

Portfolios: 3

Where we are

Locations (1)

Offices where Stakk operates.

Headquarter
United Kingdom

United Kingdom

37 Lombard Street
London, England EC3V 9BQ
020 3314 4040