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AI legal copilot for Spanish law firms that answers from official sources and checks every cited court decision · Spain

Prudencia.ai: Product, team and how it was built

Small teamB2BLegal

Prudencia.ai (AI legal copilot for Spanish law firms that answers from official sources and checks every cited court decision, Spain): 10K+ registered users and 500+ paying customers, August 2026. Evidence grade E: no revenue figure was checked. Team: 2 co-founders (Carlos Guerrero, lawyer and CEO; Jaume Bosch, CTO) and 3 employees, 5 people in May and August 2026. Launched 2 February 2026; still running, revenue growing.Added 6 November 2026

Outcome
10K+ registered users and 500+ paying customers, August 2026Revenue growing
Evidence
E no revenue figure was checked
Launch
2 February 2026
Status
Still running
Team
2 co-founders (Carlos Guerrero, lawyer and CEO; Jaume Bosch, CTO) and 3 employees, 5 people in May and August 2026
Outside funding
None: bootstrapped with the founders' own money, according to El Español (August 2026)
Main channel
Not stated
No revenue figure

What is not verified

No revenue figure was found. The counts of 10,000 registered users and 500 paying customers come from the company, as reported by El Español on 17 August 2026 and repeated by El Ecosistema Startup the same day; the article says "three months after launch" although it appeared six months after the launch date it gives. The €1.5 million in the press is a target for the end of 2026, not revenue. No payment-processor profile or filing was found. A reader could look for a Spanish company-register filing or a later interview with a revenue figure. This story is grade E: the business is real and its product, price and customers are described from public pages, but no revenue figure was checked. Aiolum shows it as an idea worth studying, not as proof that it makes money.

Prudencia.ai is a legal copilot: an AI assistant that works next to a lawyer and leaves the decision to the lawyer. It uses RAG (retrieval-augmented generation: the system first finds relevant passages in a fixed collection of documents and then has the language model answer from them) over the BOE (Boletín Oficial del Estado, the official gazette where Spanish laws are published), CENDOJ (the case-law database of the Spanish judiciary) and EUR-Lex, the European Union's law database. The pricing page says every cited court decision is checked against this index before the answer is shown.

Carlos Guerrero, a lawyer, and Jaume Bosch, the CTO, started it in Barcelona with their own money. El Español wrote on 17 August 2026 that the product launched on 2 February 2026, that it had passed 10,000 registered users and 500 paying customers three months after launch, and that it runs with a core team of five people. In March 2026 a press article reported 1,000 active users after one month.

This story has no revenue figure. The only money amount in the press is a target of €1.5 million of recurring revenue by the end of 2026, stated in El Español as a plan, so the headline is the customer count.

Prudencia.ai: 10K+ registered users and 500+ paying customers, August 2026. AI legal copilot for Spanish law firms that answers from official sources and checks every cited court decision, Spain, team of 2 to 10, evidence grade E.
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01

How much revenue does Prudencia.ai make?

Each row shows the evidence grade and the source numbers from the list at the end of this page. The grades are explained in How Aiolum verifies.

A Spanish legal AI assistant launched in February 2026 by two co-founders without investors, with 500 paying customers reported in August 2026 and no revenue figure
FactValueGradeHow we knowSources
Registered users and paying customers, August 2026more than 10,000 registered users and more than 500 paying customersCEl Español, 17 August 2026: "ha superado los 10.000 usuarios registrados y ya cuenta con más de 500 clientes de pago" (it has passed 10,000 registered users and already has more than 500 paying customers, translation), "en apenas tres meses desde su lanzamiento" (in only three months since its launch, translation). Company figures given to the newspaper.[4, 5]
Revenuenot publishedENo source read for this page gives a revenue figure. El Español gives only a target of 1.5 million euros of recurring revenue by the end of 2026.[4]
Users after one month, March 2026more than 1,000 active usersCAndalucía Buenas Noticias, 4 March 2026: "ha superado los 1.000 usuarios activos" (has passed 1,000 active users, translation).[6]
Paying subscribers, May 2026300CEl Ecosistema Startup, 13 May 2026: "alcanzó 300 suscriptores de pago en 3 meses" (reached 300 paying subscribers in 3 months, translation). Its source list cites La Vanguardia, which this page could not read.[7]
Launch2 February 2026CEl Español: "vio la luz oficialmente el 2 de febrero de 2026" (officially launched on 2 February 2026, translation). The idea dates from November 2023.[4]
FoundersCarlos Guerrero (lawyer, more than 20 years of practice) and Jaume Bosch (CTO)CThe company's About page and investor page name both; El Español says they founded the legal marketplace Lexgoapp together about ten years earlier.[3, 4]
Team5 people: the 2 co-founders and 3 employeesCEl Ecosistema Startup, May 2026: "da empleo a 5 personas (los 2 cofundadores + 3 empleados)"; El Español, August 2026: "un equipo core de cinco personas" (a core team of five people, translation).[4, 7]
Outside fundingnoneCEl Español: "creciendo sin financiación externa" (growing without outside funding, translation). The company's site has a page for investors that offers a pitch deck.[4, 8]
Pricesfree trial of 25 interactions; Pro €79 a month; Teams €138 a month for 2 usersCPricing page, 6 November 2026, VAT not included.[2]
Prices in US dollarsabout US$88.19 and US$154.05 a month billed monthlycalcCalculated: euro prices times US$1.1163 per euro (H.10, 30 October 2026).[2, 10]
AI model providersOpenAI and AnthropicCPrivacy policy, section 7.1: "Proveedores de modelos de lenguaje (IA): OpenAI Ireland Ltd y Anthropic, PBC"; hosting on Amazon Web Services in the Spain region.[9]
Time from launch to the customer count6 monthscalcCalculated: February 2026 to August 2026, the date of the El Español article.[4]

How to read this table: grade C is what the company writes on its own site, or what the founder told a newspaper. Grade A is an official exchange-rate table. An "X" value was computed on this page. No revenue value exists.

Prudencia.ai prices on 6 November 2026, read from the company's pricing page (grade C). The page gives euros without VAT; US dollars at the Federal Reserve H.10 rate of 30 October 2026, US$1.1163 per euro
PlanPer month, billed yearly (US$)Per month, billed monthly (US$)Limit
Free001 user, 25 interactions
Pro73.4988.19€65.83 / €79 a month; 1 user, unlimited interactions
Teams128.37154.05€115 / €138 a month; 2 users, up to 5 at €59 per extra user
Enterpriseprice on request; unlimited users, API access

The yearly plan is one payment of €790 for Pro and €1,380 for Teams (two months free, according to the page). Teams covers 2 users at €138 a month billed monthly and goes up to 5 users at €59 a month per extra user. Enterprise has unlimited users, API access and training, price on request. All plans can be cancelled at any time. In May 2026 El Ecosistema Startup listed different plans: Starter at €69 a month and Teams at €79 a month per user.

02

When did Prudencia.ai launch, and how did it grow?

From the idea in November 2023 to 500 paying customers in August 2026. Each entry carries its grade.

  1. November 2023CCarlos Guerrero sees lawyers use ChatGPT and decides with Jaume Bosch to build a specialist legal AI. [4]
  2. 2 February 2026CPrudencia.ai launches officially. [4]
  3. 4 March 2026CA press article reports more than 1,000 active users after one month. [6]
  4. 13 May 2026CEl Ecosistema Startup reports 300 paying subscribers, plans at €69 and €79 a month, and a team of 5. [7]
  5. 17 August 2026CEl Español reports more than 10,000 registered users, more than 500 paying customers, 175,000 interactions, a plan for Portugal and a target of 1,500 paying customers. [4, 5]
  6. 6 November 2026CThe pricing page sells Pro at €79 a month and Teams at €138 a month for 2 users. [2]
03

Why did Prudencia.ai work?

Four causes, in the order they mattered. Each one is a reusable lesson.

01

Answers only from official sources

The pricing page says it answers from the BOE, the gazettes of the regions, the EU Official Journal, Spanish and EU courts and tax and data-protection authorities, not from the open web, updated every day.

02

Citation check before display

Each cited court decision is looked up in the company's own index. If it is not there, the answer is regenerated, and if the citation comes back, it is removed. The page says this sometimes hides real decisions not yet indexed.

03

A lawyer-founder in a narrow market

One founder practises law and the other builds the software. The product covers one legal system in Spanish, and El Español says it targets firms of up to 50 lawyers, where the international publishers are weaker.

04

A price for one lawyer

A self-service plan at €79 a month lets an individual lawyer pay by card, without a sales call or a yearly contract.

How it was built

These details come from the company's own pages and from El Español. They are grade C. [9, 4, 2]

  • Retrieval-augmented generation over BOE, CENDOJ, EUR-Lex, regional gazettes and tax-agency decisions, indexed daily.
  • Language models from OpenAI and Anthropic, named in the privacy policy as data processors.
  • Hosting and storage on Amazon Web Services in the Spain region.
  • Google for analytics and sign-in, HubSpot as CRM and Sentry for error monitoring.
  • Upload of PDF and DOCX documents and of MP3 or MP4 audio, custom assistants called Gems and shared case files for teams.

Tools named in the sources

Each one opens its page in the Tools tab, with every story that uses it.

04

Who tried this before Prudencia.ai, and why did they fail?

Three companies in our database of failed startups promised lawyers faster research or automated legal work and failed. The values below are from that database and are not independently verified.

Died 2015 to 2018Burned US$13M

ROSS Intelligence

The promise

AI legal research that finds the relevant case law from a question in plain language.

Why it died

Lawyers stayed with the large legal databases they already paid for.

Competition
Died 2015 to 2018Burned US$120K

jEugene

The promise

An algorithm that finds errors and inconsistencies in contracts for law firms and legal departments.

Why it died

Better-funded AI rivals and slow adoption by law firms left it without money.

Competition
Died 2017 to 2021Burned US$75M

Atrium

The promise

A law firm for startups with software that automates legal workflows.

Why it died

The automation could not handle real legal complexity, so it had the costs of a large firm.

Product/Tech Failure

The failed startups come from our database of 1,749 dead startups, retold here in our own words. Its entries are AI-assisted summaries of public sources, so these cards carry no evidence grade.

What changed

ROSS Intelligence and jEugene had to build their own language technology with venture money and still lost to the large legal databases. Prudencia.ai rents language models from OpenAI and Anthropic and puts its work into the index of official sources and the citation check, which the official sources make possible because the BOE and CENDOJ publish their texts.

Atrium shows what stays hard: legal work is complex and the responsibility stays with the lawyer. Prudencia.ai sells to lawyers instead of replacing them and says the final decision is always human.

05

Can one person copy Prudencia.ai now?

Partly. It needs a domain expert as co-founder.

The software parts are common: a RAG index over public official texts and models from the large providers. The trust that sells it comes from a practising lawyer and a check that removes invented citations.

Where it is still open: The same model for other legal systems in one language, or for tax advisers and other regulated professions with public official sources.

  1. 1Pick a profession where invented answers have a real cost, and where the official texts are public.
  2. 2Index those texts daily and link every answer to the original document.
  3. 3Check each citation against the index before showing it, and drop the ones that fail.
  4. 4Publish a self-service price that one professional can pay by card.

What could go wrong for Prudencia.ai?

The risks are the mirror image of the causes above.

What is not verified

No revenue figure was found. The counts of 10,000 registered users and 500 paying customers come from the company, as reported by El Español on 17 August 2026 and repeated by El Ecosistema Startup the same day; the article says "three months after launch" although it appeared six months after the launch date it gives. The €1.5 million in the press is a target for the end of 2026, not revenue. No payment-processor profile or filing was found. A reader could look for a Spanish company-register filing or a later interview with a revenue figure.

Competition

El Español and El Ecosistema Startup name Lexiel, Tirant AI, Aranzadi IA, vLex and Sepín HELENA as competitors. On this site the closest story is Maite.ai, a bootstrapped Spanish legal copilot sold to Doctrine in February 2026, which also appears in Prudencia.ai's own ranking page.

Dependence on model providers

The privacy policy names OpenAI Ireland Ltd and Anthropic, PBC as its language-model providers. A price change or a change in their terms changes Prudencia.ai's costs and output.

Claims on its own pages

The site shows "#1 en el Ranking Índice de Fiabilidad Jurídica" with 90.6 out of 100 from a benchmark by observatorio.legal of 15 legal assistants; this page did not check who runs that benchmark. A March 2026 press release lists law students among the users; the product is a research tool, not an essay writer.

Sources

The grade next to each source is the best grade that the source can support. "Read in full" means that the text of the page was downloaded and the numbers were checked in it.

  1. C Prudencia.ai home page: IA jurídica y legal para abogados en España, read 6 November 2026
    Read in full, in Spanish. Source for the product description and the ranking badge.
  2. C Prudencia.ai Precios y planes, read 6 November 2026
    Read in full, in Spanish, including the monthly and yearly prices in the page code. Source for the plans, the sources list and the citation check.
  3. C Prudencia.ai Nosotros, read 6 November 2026
    Read in full, in Spanish. Source for the founders.
  4. C La inteligencia artificial creada por y para el sector legal que destierra (por fin) las alucinaciones de los tribunales (Beatriz Aznar, El Español, 17 August 2026)
    Read in full, in Spanish. Interview with Carlos Guerrero; source for the launch date, users, paying customers, team, funding and target.
  5. C Prudencia.ai: 10.000 usuarios en 3 meses sin financiación externa (El Ecosistema Startup, 17 August 2026)
    Read in full, in Spanish. A rewrite of the El Español article, which it cites; not an independent second source.
  6. C Más de 1.000 usuarios en un mes: Prudencia.ai impulsa IA jurídica en España con seguridad y cumplimiento (Andalucía Buenas Noticias, 4 March 2026)
    Read in full, in Spanish. A press release style article; source for the 1,000 active users.
  7. C Prudencia.ai: 1.000 usuarios en 1 mes con IA legal (El Ecosistema Startup, 13 May 2026)
    Read in full, in Spanish. Source for the May 2026 plans, the 300 paying subscribers and the team of 5. It cites La Vanguardia, whose robots.txt disallows ClaudeBot, so that article was not read.
  8. C Prudencia.ai Para inversores, read 6 November 2026
    Read in full, in Spanish. Source for the business model and the request for investors.
  9. C Prudencia.ai Política de Privacidad, read 6 November 2026
    Read the section on data processors (7.1). Source for the model providers and the hosting.
  10. A Federal Reserve statistical release H.10, euro historical rates
    Read the row for 30 October 2026: US$1.1163 per euro.
  11. C Database of failed startups, local export
    Local export. AI-written summaries, not independently verified. Source for the failed predecessors.
  12. C Prudencia.ai Ranking de fiabilidad de IA jurídica, read 6 November 2026
    Read in full, in Spanish. The company's page about the observatorio.legal benchmark, which lists Maite.ai among the 15 assistants; the benchmark itself was not read.

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