Company lists · Data refreshed September 2026
Top 25 Custom web software agencies based in Madrid, Spain
RevenueBase identified 208 custom web software agencies headquartered in Madrid, Spain as of September 2026 and tracks 961 professional contacts across them, including 139 with verified work emails. Barcelona is the largest hub.
This list covers custom web software agencies headquartered in Madrid, Spain, 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 24, 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.
The 25 largest custom web software agencies based in Madrid, Spain
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 43 contacts → | ||||
Partial evidence “Aditelsa fue fundada en 2002 y a lo largo de los años ha ido consolidando un sólido prestigio en el área de Desarrollos y Proyectos Software, especialmente en Gestores de Bases de…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 2 | 42 contacts → | ||||
Indirect evidence “Atlántida nace en 1993, evolucionando exponencialmente tanto en el personal incorporado a la compañía, como en la cobertura de servicios que ofrecemos a nuestros clientes.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 3 | 38 contacts → | ||||
Strong evidence “Magnético es una empresa de desarrollo de software a medida especializada en el desarrollo de aplicaciones móviles y web.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 4 | 34 contacts → | ||||
Partial evidence “Customised solutions target both large corporations and small businesses, and are optimised using cutting-edge technologies.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 5 | 30 contacts → | ||||
Indirect evidence “We are a boutique agency specializing in designing, building, and optimising B2C and B2B digital channels.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 6 | 28 contacts → | ||||
Indirect evidence “Fantasy Space is an AI-driven product engineering and business transformation company.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 7 | 23 contacts → | ||||
Partial evidence “Varadero Software Factory (VSF) es una empresa nacida en el año en el seno de la Universidad Complutense de Madrid (U.C.M) especializada en servicios y soluciones de diseño…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 8 | 12 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 9 | 11 contacts → | ||||
Partial evidence “Duonet es una empresa especializada en diseño y programación web, así como en el diseño de aplicaciones de gestión empresarial.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 10 | 10 contacts → | ||||
Strong evidence “Diseñamos y desarrollamos webs, apps y software inteligente.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 11 | 10 contacts → | ||||
Partial evidence “WE MAKE IT HAPPEN Development software company and technology consulting.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Partial evidence “Somos una nueva empresa dedicada al diseño y desarrollo de sitios web y aplicaciones para dispositivos móviles.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 13 | 9 contacts → | ||||
Partial evidence “Diseñamos y desarrollamos software que se adapta a tus necesidades y procesos de negocio, algo indispensable en el mundo de la empresa actual y que en ocasiones se hace al revés…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 14 | 8 contacts → | ||||
Indirect evidence “En TARTIS, nos dedicamos al diseño e implementación de soluciones digitales para empresas de todos los tamaños y sectores.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 15 | 8 contacts → | ||||
Partial evidence “Desarrollo de Software a Medida | Soluciones Escalables | Innovación Tecnológica Descripción actualizada: En Koochapps, llevamos más de 10 años redefiniendo los estándares del…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 16 | 8 contacts → | ||||
Strong evidence “Web Software Development.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 17 | 8 contacts → | ||||
Indirect evidence “Con una dilatada y contrastada experiencia en el sector informático, Zimasolutions ofrece a través de sus diferentes departamentos, servicios para la Pequeña, Mediana y Gran…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 18 | 7 contacts → | ||||
Partial evidence “Especialistas en desarrollo de software a medida con 3 divisiones principales, Real Estate, Transformación digital y Seguridad de la información.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 19 | 7 contacts → | ||||
Indirect evidence “AWARD WINNING AGENCY : Number 1 Happy at work 2023 https://choosemycompany.com/en/rankings/2023/at-work?regionCode=ES & size=1-49 Full service agency · Technology first We believe…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 20 | 7 contacts → | ||||
Indirect evidence “Somos una agencia digital global, comprometida con nuestros clientes en la rentabilidad de sus negocios en el entorno de Internet.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 contacts → | ||||
Partial evidence “Web Design and Digital Marketing Agency in Madrid.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 contacts → | ||||
Partial evidence “Pinout Solutions es una consultoría tecnológica especializada en el diseño de software para la gestión empresarial.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 23 | 6 contacts → | ||||
Indirect evidence “En Bonzzay, somos un equipo de especialistas en tecnología con más de 10 años de experiencia ayudando a startups y grandes empresas a transformar sus ideas en productos digitales…” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 24 | 6 contacts → | ||||
Partial evidence “Desarrollo de software a medida.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 contacts → | ||||
Strong evidence “We have been developing web software and advising on technology to teams of different sizes for more than 15 years.” Source: RevenueBase Database · checked Sep 24, 2026Thanks. The Data Team will review it. | |||||
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 web software agencies. 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 web software agencies.
- Partial evidence
- Its own public description names part of custom web software agencies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name custom web software agencies. 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 208 custom web software agencies based in Madrid, Spain
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Custom web software agencies based in Madrid, Spain at a glance
As of Sep 24, 2026Companies by employee count
Email recency for this list is measured across the whole Spain list rather than for Madrid, so it is reported there. Company counts and contact totals on this page are exact for Madrid, over 208 companies.
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 web software agencies, 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 Madrid, Spain whose own description of what they do matches “custom web software agencies”. 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 web software agencies), 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 web software agencies, and records with no verified work email. Companies headquartered outside Madrid 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, 139 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 24, 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 web software agencies by metro in Spain
- Custom web software agencies in Barcelona224
- Custom web software agencies in Madrid208
- Custom web software agencies in Valencia77
- Custom web software agencies in Malaga31
- Custom web software agencies in Sevilla29
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 web software agencies, 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 web software agencies are there based in Madrid, Spain?
RevenueBase identified 208 custom web software agencies headquartered in Madrid, Spain 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?
Aditelsa, headquartered in Madrid, tops this list with the largest team on record.
Which city has the most custom web software agencies?
Barcelona leads with 224 headquartered companies, followed by Madrid (208) and Valencia (77).
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 139 verified decision-maker contacts tracked across these 208 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 24, 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.
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