Leaf through the premier custom software development companies in London that customize, maintain and/or build high-quality solutions, mobile applications and more. Filter listings by reviews, pricing, team size to find the ideal team for your project requirements and budget.
Best London Software Development Firm Rankings
4 Companies-Rankings updated: September 12, 2026
Each agency listed on DesignRush is assessed for industry expertise and customer testimonials are evaluated in order to provide you with a vetted selection. Certain listings represent paid partnerships.
One Beyond specializes in government custom software development, offering tailored solutions for the Government and Public Sector. From inception to post-launch support, we're a committed partner...
Top Services:
Software Development
Staff Augmentation
CRM Consulting
ERP Consulting
DevOps Consulting
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Location
London, United Kingdom
Number of Employees
250 - 499
Average Hourly Rate
$99/hr
Minimal Budget
$50,000 & Up
Portfolios Count
9 Projects Listed
One Beyond Services
Software Development
Staff Augmentation
CRM Consulting
ERP Consulting
DevOps Consulting
Web Development
IoT
UI/UX Design
Mobile App Development
Product Design
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Costa Express
WaterAid
Pearson
MHRA
GAIL's
Haymarket
Smith+Nephew
ActionAid
Bourne Leisure
Willis Towers Watson
Data sourced from the agency's DesignRush profile
One Beyond Reviews & Testimonials
James Jackson-Nichols Review from Google
5.0★
James Jackson-Nichols's Review Sourced from Google
A key partner for us for the past two years - outstanding developers, great communication from all members of the team, and a team that consistently delivers. Very highly recommended, and a great group of people on top of everything else.
Paul O'Brien Review from Google
5.0★
Paul O'Brien's Review Sourced from Google
Great software developers delivering a complex bespoke project for our business resulting in a fantastic end user product
Meghan Byrd Review from Google
5.0★
Meghan Byrd's Review Sourced from Google
I've worked with 2 different engineers from GuideSmiths and they've both been terrific. Good communication, high quality code, good work ethic. Would highly recommend working with them on a project or ongoing basis.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
We build mobile apps, web platforms & AI workflows for organisations doing good in the world.
3 Sided Cube is a global mobile app and digital development company with a passion for Tech For Good, championing the genius over the generic to build life-saving, life-changing digital solutions...
Top Services:
Mobile App Development
Software Development
Web Development
AI Development
Digital Services
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Location
London, United Kingdom
Number of Employees
50 - 99
Average Hourly Rate
$150/hr
Minimal Budget
$50,000 & Up
Portfolios Count
5 Projects Listed
3 Sided Cube Services
Mobile App Development
Software Development
Web Development
AI Development
Digital Services
UI/UX Design
Digital Strategy
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
American Red Cross
Surfers Against Sewage
Omaze
Vodafone | Glastonbury Festival
LUSH
Global Forest Watch
The World Resources Institute
University Of Bristol
GDPC
Wonderbly
Data sourced from the agency's DesignRush profile
3 Sided Cube Reviews & Testimonials
Si Muddell Review from Google
4.0★
Si Muddell's Review Sourced from Google
Fantastically positive and driven team who on every interaction you just know care deeply about a) what they do b) what they deliver and c) ultimately the experience the end user will have.Hugely impressed with their personal, creative and energy driven approach at the pitch stage, I commissioned 3SC to help us better scope an app. Their task was to take an in-house developed app prototype, and turn it into a fully fledged technical specification with user stories, MoSCoW prioritisation, costs, and an updated look and feel; all done with audience need at the heart.Myself and the wider team have nothing but very good things to say about 3SC. When reflecting on an agency to work with, loads say they can do it, some can actually do what they say they can do, even less do it in the spirit of real partnership and mutually respect/drive. 3SC do all of these excellently. I highly recommend them.
Oliver Morrison Review from Google
5.0★
Oliver Morrison's Review Sourced from Google
A passionate team of insanely talented experts, producing industry leading technology for good causes. Highly recommend.
Kev Borrill Review from Google
5.0★
Kev Borrill's Review Sourced from Google
Great Digital agency with a passion for making great mobile apps in the Tech for good industry
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Creating Mobile Apps That Digitally Transform Business
Sugar Rush is a Mobile App Agency that provides mobile app development services to clients in the UK, Ireland, Europe, and the US. They have received recognition as the "UK App Agency of the Year" and have won 'App of The Year' awards for three consecutive years in Northern Ireland...
Top Services:
Mobile App Development
Web Design
Software Development
VR/AR
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Location
London, United Kingdom
Number of Employees
Under 49
Minimal Budget
$50,000 & Up
Portfolios Count
1 Project Listed
Sugar Rush Services
Mobile App Development
Web Design
Software Development
VR/AR
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
BUNZL
BBC
Radio Times
TopGear
Game of Thrones
Stryker
Olympus
Angling Direct
Data sourced from the agency's DesignRush profile
Sugar Rush Reviews & Testimonials
Dean Lyttle Review from Google
5.0★
Dean Lyttle's Review Sourced from Google
On behalf of AES Global Ltd -Moving our app development locally was a key focus for us in 2020. After extensive research into local companies and speaking to them all Ali, Danielle and the whole team at Sugar Rush most definitely came out on top.Their company culture and attention to detail was what caught our eye first which was followed closely on their project management skills.We are currently working on our 4th project together and i am still amazed with their dedication to learn our product inside out so they truly understand how it should function with the app and provide new ideas and better flows than what we had before.We have dealt with a large number of different colleagues within Sugar Rush and every single one of them are a credit to the company and provide a brilliant customer experience.Here is to the last 2 year partnership with many more years to follow. Thank you Sugar Rush for your partnership and helping to modernise and optimise our app platform.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
NJI Media is a reputable interactive agency that specializes in creating stunning designs, web development, multimedia production and effective online communications strategies. We offer these services to various high-profile corporate, political, and non-profit organizations across the United States...
Top Services:
Branding
Web Design
UI/UX Design
Web Development
Digital Services
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Location
London, United Kingdom
Number of Employees
Under 49
Average Hourly Rate
$199/hr
Minimal Budget
$50,000 & Up
NJI Media Services
Branding
Web Design
UI/UX Design
Web Development
Digital Services
Software Development
Digital Strategy
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts