Top IT Service Providers in London

Between them, the 107 IT service providers on this page cover web development (96), web design (85), UI/UX design (56) and IT services (55). They also list work in United Kingdom, United States of America, Ireland and Russia. 107 of them have written a profile you can read before you get in touch.

Listings marked Sponsored are promoted by TrustList. They are scored like every other listing and keep the position they earn.

1. =48

   

   OryxAlign

   Web Development · Web Design · IT Services · Also in United Kingdom

   OryxAlign is a managed services provider based in West London that serves the UK and Europe.

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   Why #48 (shared): Based in West London, UK · professional accreditation, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

2. =48

   

   T-Tech

   Web Development · Web Design · UI/UX Design · Also in United Kingdom

   T-Tech is a London-based technology consultancy that provides IT support, cloud, security and managed services.

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   Why #48 (shared): Based in London · Microsoft partner, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

3. Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
4. –

   

   Strange

   Search Engine Optimization · Web Development · Web Design · Also in United Kingdom

   Strange is a digital marketing and web development agency. It runs paid and organic marketing campaigns and builds websites, and the stored profile says it has worked with clients…

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   On record: In business 25+ years, as stated on its own website, read 5 Oct 2026

5. –

   LM

   London Marketing Company

   With London Marketing Company as your partner, we'll provide you with only the best experts in the field who will understand your business and goals.

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   On record: Address in London

6. –

   

   Zepto Systems ltd

   Sponsored

   Mobile App Development · Custom Software Development · Web Development · Also in Islamabad

   We are an IT service company providing full-scale Software Development, Bespoke Solutions, Cyber Security, Managed Project Development and Remote Developers to our clients…

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   On record: Address in London

7. –

   

   Cognifide

   Web Development · Web Design · UI/UX Design · Also in United Kingdom

   Cognifide is a marketing technology consultancy that belongs to WPP.

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   On record: Based in London, United Kingdom · Team of 400+, as stated on its own website, read 5 Oct 2026

8. –

   

   Kagool

   Mobile App Development · Custom Software Development · Web Development · Also in United Kingdom

   Kagool is a digital agency that concentrates on the Sitecore platform. The older listing text places offices in Cardiff, Manchester and London.

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   On record: Based in Cardiff, Manchester and London, as stated on its own website, read 5 Oct 2026

9. –

   

   56 Degrees

   Mobile App Development · Web Development · Web Design · Also in United Kingdom

   56 Degrees is a London web development firm. It concentrates on three kinds of work: building new sites, migrating existing ones and redeveloping them, from microsites to…

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   On record: Based in London

10. –

    

    Advisority

    Software Development · E-Commerce Development · Software Testing · Also in Romania

    Advisority is a European business and technology service provider headquartered in London.

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    On record: Based in London

11. –

    

    Agnian

    Custom Software Development · Web Development · Web Design · Also in United Kingdom

    Agnian is a digital product agency working from London in the UK and Yerevan in Armenia.

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    On record: Based in London, UK, and Yerevan, Armenia

12. –

    

    Aicura Solutions

    Web Development · Web Design · UI/UX Design · Also in United Kingdom

    Aicura Solutions is a financial services technology provider with a base in London and a team working remotely around the world.

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    On record: Based in London

13. –

    AB

    Argo Blockchain

    IT Services · iOS App · Software Development · Also in United Kingdom

    Argo Blockchain is a cryptocurrency mining company listed in London and on the Nasdaq Capital Market.

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    On record: Address in London

14. –

    

    AVITHA

    Mobile App Development · Web Development · iOS App · Also in United Kingdom

    AVITHA is the audio-visual, IT and home automation arm of AboundE, an electronics company. It works from London and serves private clients and businesses in the UK and abroad.

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    On record: Based in London, England

15. –

    

    Blocksmith

    Web Development · Web Design · UI/UX Design · Also in United Kingdom

    Blocksmith is a blockchain studio in London. It spun out of the product studio Whitesmith and has the backing of KR1, a European digital asset investor.

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    On record: Based in London, UK

16. –

    

    Brand42

    Social Media Marketing · Web Development · Web Design · Also in United Kingdom

    Brand42 is an independent design and digital agency based in London with a global focus.

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    On record: Based in London, UK

17. –

    

    Breed Reply

    Web Development · Web Design · UI/UX Design · Also in United Kingdom

    Specialist member of the Reply network designing digital media and communication-channel solutions for large European groups

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    On record: Address in London

18. –

    

    Catch Digital

    Web Development · Drupal · SEO · Also in United Kingdom

    Catch Digital is a digital experience agency based in London. It pairs storytelling with technology to build websites and digital products for brands across several sectors.

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    On record: Based in London, UK

19. –

    C

    Chroma

    Social Media Marketing · Video Games Development · Web Development · Also in United Kingdom

    Chroma designs, builds and manages digital sports products. Its work centres on the quality of the user experience and on keeping audiences engaged with each product, and it…

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    On record: Based in London, Brighton and Sydney

20. –

    

    CleverLEAF Technology

    Web Development · Web Design · IT Services · Also in Russia

    CleverLEAF Technology is a young technology company headquartered in London that works internationally.

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    On record: Based in London, United Kingdom

21. –

    

    Code Enigma

    Web Development · Web Design · WordPress · Also in United Kingdom

    Drupal agency that develops, hosts and supports websites and web applications for publishers, public bodies and charities

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    On record: Address in London

22. –

    

    Codescrum

    Web Development · Web Design · IT Services · Also in United Kingdom

    Codescrum is a software development company serving small and medium-sized businesses in London and San Francisco.

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    On record: Based in London and San Francisco

23. –

    

    D2 Interactive

    Search Engine Optimization · Web Development · Web Design · Also in United Kingdom

    D2 Interactive is a web and mobile development agency based in the City of London.

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    On record: Based in London, UK

24. –

    

    Digital Catapult

    Mobile App Development · Web Development · iOS App · Also in United Kingdom

    Digital Catapult is a UK innovation organisation that helps companies put deep technology to practical use.

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    On record: Based in London, UK, with regional centres

25. –

    

    ecosio

    Web Development · Web Design · IT Services · Also in United Kingdom

    ecosio provides electronic data interchange services that link companies with their suppliers and customers.

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    On record: Based in London, Munich and Vienna

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