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AI Visibility Index · September 2026

Real estate agencies in Porto that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for real estate agencies in Porto, three times each, in Portuguese, and counted who they named. These are the businesses named in two or more of the 36 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Real estate agencies · Porto
97%of answers named RE/MAX
Answers
36
Businesses named
18
Named only once
4
Named by 2+ assistants
11 of 14
Named again on a rerun
69%

Edition September 2026. Download the data

Asked for real estate agencies in Porto, ChatGPT, Claude and Gemini most often named RE/MAX (97% of answers), ERA (92%) and CENTURY 21 (61%). Across 36 answers they named 18 different businesses, 4 of them only once. Each of four buyer questions was asked three times, in Portuguese, in September 2026.

The ranking

The AI Recommendation Rate is the fraction of the 36 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Real estate agencies in Porto named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1RE/MAXAlso written Remax, Remax Porto, RE/MAX Collection Porto, RE/MAX Portugal, Remax Portugal, RE/MAX VintageIs this your business?97%95%: 86 to 100%92%100%100%4 of 41.3
2ERAAlso written Era Imobiliária, ERA Porto, ERA Portugal, ERA Imobiliária, Era, Era Imobiliária PortoIs this your business?92%95%: 78 to 97%83%92%100%4 of 42.5
3CENTURY 21Also written Century 21, Century 21 Porto, Century 21 PortugalIs this your business?61%95%: 45 to 75%0%83%100%4 of 42.8
4Engel & VölkersAlso written Engel & Völkers PortoIs this your business?53%95%: 37 to 68%25%33%100%4 of 43.9
5JLLAlso written JLL Portugal, JLL Porto, JLL Residential PortugalIs this your business?47%95%: 32 to 63%17%83%42%4 of 44.7
6Keller WilliamsAlso written KW Porto, KW Portugal, KW, KW Portugal - Porto, KW Portugal PortoIs this your business?42%95%: 27 to 58%0%58%67%3 of 45.3
7Porta da Frente Christie'sIs this your business?33%95%: 20 to 50%8%92%0%4 of 43.8
8PredibisaIs this your business?25%95%: 14 to 41%67%8%0%4 of 42.9
9ZomeAlso written Imobiliária ZomeIs this your business?22%95%: 12 to 38%8%0%58%3 of 45.8
10PredimedAlso written Predimed PortoIs this your business?17%95%: 8 to 32%0%8%42%3 of 46.2
11iadAlso written IAD Portugal, IAD Portugal - agentes no PortoIs this your business?11%95%: 4 to 25%0%33%0%2 of 47.3
12Casa da PortelaIs this your business?8%95%: 3 to 22%25%0%0%3 of 42
13LUXIMOS Christie's International Real EstateAlso written LUXIMOS Christie’s International Real EstateIs this your business?8%95%: 3 to 22%25%0%0%2 of 42.3
14Sotheby's International RealtyAlso written Sotheby's International Realty PortoIs this your business?8%95%: 3 to 22%0%8%17%2 of 46.7

Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 4 more names came up in a single answer and are counted above but not listed.

Is this your business?

See what the assistants say about your business today. The free checker asks ChatGPT, Claude, Gemini and Grok two of the Index questions for this category, with the category and the place already filled in, and shows every answer word for word. About 30 seconds, no sign-up.

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What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#ChatGPTClaudeGemini
1RE/MAX92%RE/MAX100%RE/MAX100%
2ERA83%ERA92%ERA100%
3Predibisa67%Porta da Frente Christie's92%CENTURY 21100%
4Engel & Völkers25%CENTURY 2183%Engel & Völkers100%
5Casa da Portela25%JLL83%Keller Williams67%

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing
Named by AI assistants: Real estate agencies in Porto, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/real-estate-agencies/porto"><img src="https://aigrow.gg/badges/index/2026-09/real-estate-agencies/porto.svg" width="312" height="100" alt="Named by AI assistants: Real estate agencies in Porto, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant, in Portuguese. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

  1. 1Qual é a melhor agência imobiliária no Porto?Who is the best real estate agency in Porto?
  2. 2Quero vender a minha casa no Porto. Que agência imobiliária me recomendas?I want to sell my home in Porto. Which real estate agency would you recommend?
  3. 3Estou à procura de um apartamento para comprar no Porto. Que agentes imobiliários devo contactar?I'm looking for an apartment to buy in Porto. Which real estate agents should I contact?
  4. 4Que agência imobiliária no Porto me recomendas para arrendar um apartamento?Which real estate agency in Porto would you recommend for renting out an apartment?

How to read this page

The full method
What it measures
Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter
36 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings
Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong
If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Elsewhere in the Index

Real estate agencies elsewhere
LisbonBelo HorizonteRio de JaneiroSão PauloAarhusAmsterdam
Also in Porto
DentistsLawyersAccountantsPlumbersGymsRestaurants

Is your business on this list?

The free scan asks the same assistants the questions your customers ask, scores whether they name you, and lists who they name instead.

Run the free AI scanRead the method

Edition September 2026 · published by Guglielmo Paesano, founder of AIGROW · data under CC BY 4.0