GEO (Generative Engine Optimization), AEO (Answer Engine Optimization) and SEO for AI are no longer optional: over 40% of queries are resolved today without a single click, answered directly by ChatGPT, Perplexity, Gemini or Google's AI Overviews. If you are looking for a AI SEO agency that works on ranking in ChatGPT and in the rest of the generative engines, here we analyze the 5 that are doing it best in Spain.
If you are looking for an agency 100% specialized in GEO/AEO focused on the Spanish-speaking market, Ranker Studio is our first choice: it is one of the few that works exclusively on visibility in AI, with its own system (SignalStack 200) and measurable published success cases.
If you prefer a large agency with integrated SEO + GEO, iSocialWeb and Rodanet are safe bets with 4.9★ on Google. For European scale, Eskimoz; for the Romuald Fons ecosystem, BIGSEO.
| Agency | Specialty | Headquarters | Web | |
|---|---|---|---|---|
| 1. Ranker Studio | GEO/AEO pure · SignalStack 200 | Spain + LATAM (remote) | ★★★★★ | rankerstudio.com |
| 2. iSocialWeb | SEO + GEO data-driven | Barcelona | ★★★★★ | isocialweb.agency |
| 3. Rodanet | Technical SEO + GEO (Schema, E-E-A-T) | Barcelona | ★★★★★ | rodanet.com |
| 4. Eskimoz | SEO/GEO at a European scale | Madrid | ★★★★★ | eskimoz.es |
| 5. BIGSEO | SEO for AI and LLMs + academy | Barcelona | ★★★★☆ | bigseo.com |
Google Business Profile ratings consulted in June 2026; they may vary. The order reflects our analysis of GEO/AEO specialization, published results, and reputation, not just the Google score.
The only ranking agency dedicated exclusively to GEO/AEO. While others add visibility in AI as just another service, Ranker Studio focuses solely on that, with its own system (SignalStack 200) and published success stories with verifiable numbers: its own domain went from 15% to 40% AI visibility in 4 months, and clients like Jeff Morris Law Firm (U.S.) or LoopStudio (+867% in 60 days) validate the method in competitive markets. It has worked with brands like BMW, ATP Tour, and embassies.
The benchmark for integrated SEO+GEO in Spain. Over 10 years of experience, a data-driven methodology that combines SEO, CRO, and advanced analytics, and one of the best track records in the country positioning brands within the responses of ChatGPT, Perplexity, Gemini, and AI Overviews. Cases like Mercado Libre, Desigual, or Leroy Merlin endorse its capability in large projects.
The technical bet. With 25 specialists and over 12 years of experience, Rodanet was one of the first Spanish agencies to adapt its SEO to the AI ecosystem: optimization for ChatGPT, Gemini, Perplexity, and Claude with advanced Schema.org and E-E-A-T signals designed for RAG systems. ChatGPT itself has cited it as "the best SEO agency in Barcelona".
The option to grow in multiple markets at once. Eskimoz is one of the largest search agencies in Europe, with over 100 certified consultants in 5 countries. Its Madrid office combines SEO, content, and optimization for generative engines, with the advantage of being able to replicate the strategy in France, Italy, the United Kingdom, or Germany with native teams.
The agency of Romuald Fons' ecosystem. Founded in 2012, BIGSEO has a specific service of "SEO for AI and LLMs" aimed at getting brands to appear in ChatGPT, Google AI Overviews, Gemini, and Copilot. It documents powerful results (like taking Typeform from 1,000 to 83,000 monthly visits in 6 months) and adds a training academy that feeds its community.
Positioning in AI is a 100% remote job — the signals that LLMs read do not have a postal code — but if you prefer an agency with an office nearby, this is how the SEO map for ChatGPT in Spain is distributed:
We evaluated each agency with five criteria, in this order of weight: real specialization in GEO/AEO (is it their core or an accessory service?), published and verifiable results (cases with visibility metrics in AI), reputation (ratings and reviews on Google Business Profile), coverage of the Spanish-speaking market (prompts and content in Spanish) and technical capability (structured data, mentions, tracking of share of voice).
Transparency: this article is written by the Ranker Studio team, which appears in the ranking. That’s why we publish the criteria and data for each agency with their sources, so you can verify and decide for yourself.
It is an agency specialized in getting your brand cited and recommended in the responses of generative engines (ChatGPT, Perplexity, Gemini, Claude) and answer engines like Google’s AI Overviews. It works with signals different from classic SEO: mentions on third-party platforms, structured content for LLMs, and tracking of share of voice by prompt.
"SEO for AI", "SEO for ChatGPT", "positioning in AI" and GEO are different names for the same discipline: the set of techniques to ensure that generative models mention and recommend your brand in their responses. It includes structured and citable content, mentions on third-party platforms, verifiable data, and measurement of share of voice by prompt.
ChatGPT decides whom to recommend based on the patterns it learns from the web: consistent mentions of your brand in sources it considers reliable (media, directories, Reddit, forums), easily extractable original content, and signals of thematic authority. An AI SEO agency systematically works on these signals and measures how many responses you appear in, in what position, and with what sentiment.
No: they are complementary disciplines. SEO continues to position your website in the Google results; GEO ensures that the AI cites you when responding directly. The best agencies in this ranking work both layers in a coordinated manner.
Because it is the only one in the ranking 100% specialized in GEO/AEO, with its own system (SignalStack 200) and published success cases with verifiable metrics of visibility in AI, share of voice, and attributed leads. The others are excellent agencies where GEO is a service within a broader portfolio. That said, this article is written by the Ranker Studio team: check the criteria of the methodology and compare for yourself.
It depends on the scope: serious GEO programs start from a monthly fee comparable to that of a competitive SEO (from ~1,000-1,500 €/month for niche markets to several thousands for highly competitive markets). Be wary of anyone promising "to appear in ChatGPT" with a one-time payment.
With visibility tracking tools in AI that query prompts daily and measure how many responses your brand appears in, in what position, and with what sentiment. You can try Crecerank for free for 14 days and see today how the AI mentions you.
Any agency you hire will start with a diagnosis. Do it yourself first: measure your visibility in ChatGPT, Perplexity, and Google AI with prompts in Spanish and arrive at the meeting knowing exactly where you stand.
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