Company lists · Data refreshed September 2026

Top 25 Custom SaaS developers based in the United Kingdom

Name: Custom SaaS developers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 1,882 companies tracked

RevenueBase identified 1,882 custom SaaS developers headquartered in the United Kingdom as of September 2026 and tracks 14,115 professional contacts across them, including 2,474 with verified work emails and 545 with mobile numbers. London is the largest hub.

This list covers custom SaaS developers headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

1,882Companies

14,115Contacts tracked

2,474Verified emails

545Mobile numbers

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The 25 largest custom SaaS developers based in the United Kingdom

Ranked by team size

Top 25 of 1,882 custom SaaS developers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to custom SaaS developers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Dotsquares	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	501-1,000	1,581 contacts →
	Indirect evidence “We leverage the latest web and mobile technologies to build, grow and support your business.” Source: RevenueBase Database · checked Sep 29, 2026
2	Leighton	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 29, 2026	51-200	201 contacts →
	Partial evidence “Leighton is a software development business that builds high performing teams and develops successful software applications for its customers.” Source: RevenueBase Database · checked Sep 29, 2026
3	scrums.com	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	163 contacts →
	Indirect evidence “Scrums.com is the Software Engineering Orchestration Platform (SEOP).” Source: RevenueBase Database · checked Sep 29, 2026
4	Opinov8	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	154 contacts →
	Indirect evidence “Winner of the Best AI Company Award by The Netty Awards · Headquartered in London, powered by a worldwide team of engineers across Europe, Egypt, and the Americas.” Source: RevenueBase Database · checked Sep 29, 2026
5	Intagleo Systems	Indirect evidence	Slough, United KingdomHQ checked Sep 29, 2026	51-200	138 contacts →
	Indirect evidence “For over 22 years, Intagleo has been a trusted partner for businesses worldwide and US Primes, empowering them to achieve their digital transformation goals through innovative…” Source: RevenueBase Database · checked Sep 29, 2026
6	Synycs Group	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	132 contacts →
	Indirect evidence “Incorporated in 2014 and headquartered in the UK, Synycs Group is a CMMI Level 4 industry-leading & most reliable software and mobile app development company known for delivering…” Source: RevenueBase Database · checked Sep 29, 2026
7	Orchestra	Indirect evidence	Woolwich, United KingdomHQ checked Sep 29, 2026	n/a	129 contacts →
	Indirect evidence “Founded in 2007, we are independent, knowledgeable and reliable.” Source: RevenueBase Database · checked Sep 29, 2026
8	PDMS	Indirect evidence	Braddan, United KingdomHQ checked Sep 29, 2026	51-200	92 contacts →
	Indirect evidence “PDMS is a technology company providing software development and digital transformation services.” Source: RevenueBase Database · checked Sep 29, 2026
9	BIT Wave Solutions Limited	Partial evidence	Reading, United KingdomHQ checked Sep 29, 2026	11-50	75 contacts →
	Partial evidence “Headquartered at Reading, Berkshire in United Kingdom, Bit Wave Solutions enables global businesses to build their future by directing clients’ innovation & customization agenda.” Source: RevenueBase Database · checked Sep 29, 2026
10	Timspark	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	73 contacts →
	Partial evidence “Timspark is a software development company/hub that creates custom software solutions to fit clients’ business needs.” Source: RevenueBase Database · checked Sep 29, 2026
11	TX Dynamics	Indirect evidence	Birmingham, United KingdomHQ checked Sep 29, 2026	51-200	72 contacts →
	Indirect evidence “TX Dynamics is a software development company, that helps businesses with product design, web and application development, and technology acceleration.” Source: RevenueBase Database · checked Sep 29, 2026
12	Podtech	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 29, 2026	51-200	69 contacts →
	Indirect evidence “PODTECH is a software development company with a comprehensive suite of services.” Source: RevenueBase Database · checked Sep 29, 2026
13	Blueberry Consultants LTD	Indirect evidence	Birmingham, United KingdomHQ checked Sep 29, 2026	51-200	65 contacts →
	Indirect evidence “Blueberry Consultants is a private limited software development company, formed in 1997 by the current Managing Director, Martin Green.” Source: RevenueBase Database · checked Sep 29, 2026
14	Versatile Commerce	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 29, 2026	51-200	64 contacts →
	Indirect evidence “Versatile Commerce is an innovative bespoke software development company headquartered in the UK, with offices in the US and India.” Source: RevenueBase Database · checked Sep 29, 2026
15	Codex Software	Indirect evidence	Cirencester, United KingdomHQ checked Sep 29, 2026	51-200	63 contacts →
	Indirect evidence “Codex makes software simple, strategic, and reliable.” Source: RevenueBase Database · checked Sep 29, 2026
16	Ghyston	Indirect evidence	Bristol, United KingdomHQ checked Sep 29, 2026	51-200	61 contacts →
	Indirect evidence “Ghyston is an award-winning UK software company based in Bristol.” Source: RevenueBase Database · checked Sep 29, 2026
17	Gemba Advantage	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	59 contacts →
	Indirect evidence “Gemba Advantage make high-impact software that is secure, scalable and sustainable.” Source: RevenueBase Database · checked Sep 29, 2026
18	Arramton Infotech LTD	Indirect evidence	Teddington London, United KingdomHQ checked Sep 29, 2026	51-200	56 contacts →
	Indirect evidence “Arramton Infotech is a UK-registered software and app development company trusted by startups and established businesses across the United Kingdom and United States.” Source: RevenueBase Database · checked Sep 29, 2026
19	Aircury	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	55 contacts →
	Indirect evidence “Aircury offers high quality software development for the education and non-profit sectors We specialise in- Full-stack application development for web and mobile- API and…” Source: RevenueBase Database · checked Sep 29, 2026
20	Satva Softech	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	53 contacts →
	Indirect evidence “Established in 2015, SATVA Softech has carved a distinguished niche in the global technology landscape.” Source: RevenueBase Database · checked Sep 29, 2026
21	Warrgyizmorsch	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	51 contacts →
	Partial evidence “Tailored ERP, CRM & SaaS that automates your operations and fuels measurable growth.” Source: RevenueBase Database · checked Sep 29, 2026
22	Insight International UK LTD	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	50 contacts →
	Indirect evidence “We provide Software Development, Maintenance and Other Related IT Services, across spectrum, depending on individual client’s needs and dependability on us.” Source: RevenueBase Database · checked Sep 29, 2026
23	SKO Systems	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	45 contacts →
	Indirect evidence “At SKO Systems, we engineer enterprise-grade software ecosystems designed for the unique, high-stakes realities of the maritime environment.” Source: RevenueBase Database · checked Sep 29, 2026
24	Layoutindex	Indirect evidence	Stevenage, United KingdomHQ checked Sep 29, 2026	51-200	45 contacts →
	Indirect evidence “LAYOUTindex is a bespoke technology company that specializes in providing business-critical solutions that enable organizations to leverage technology & forge ahead successfully.” Source: RevenueBase Database · checked Sep 29, 2026
25	Neworbit LTD	Indirect evidence	Chalgrove, United KingdomHQ checked Sep 29, 2026	11-50	44 contacts →
	Indirect evidence “At NewOrbit, we don’t just develop software-we craft tailored, web-based business solutions that empower companies to innovate, grow, and stay ahead of the curve.” Source: RevenueBase Database · checked Sep 29, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: custom SaaS developers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names custom SaaS developers.
Partial evidence: Its own public description names part of custom SaaS developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom SaaS developers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,882 custom SaaS developers based in the United Kingdom

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Custom SaaS developers based in the United Kingdom at a glance

As of Sep 29, 2026

17.5%Verified-email coverage

3.9%Mobile-number coverage

7.5Average contacts per company

1-10Median size (employees)

33.4%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

1,210

11-50

534

51-200

100

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 31.0d

1,0580–30

1,32531–60

7461–90

390–180

14180+

Company record updated

Median 93.0d

00–30

91231–60

5,88661–90

6,43990–180

878180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among custom SaaS developers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “custom SaaS developers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names custom SaaS developers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among custom SaaS developers, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 2,474 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Custom SaaS developers by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names custom SaaS developers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many custom SaaS developers are there based in the United Kingdom?

RevenueBase identified 1,882 custom SaaS developers headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Dotsquares, headquartered in London, tops this list with the largest team on record.

Which city has the most custom SaaS developers?

London leads with 628 headquartered companies, followed by Manchester (53) and Birmingham (31).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,474 verified decision-maker contacts tracked across these 1,882 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.