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AI Visibility Index · September 2026

Plumbers in Porto that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for plumbers 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.

Plumbers · Porto
72%of answers named Canalizador 24h
Answers
36
Businesses named
31
Named only once
17
Named by 2+ assistants
7 of 14
Named again on a rerun
39%

Edition September 2026. Download the data

Asked for plumbers in Porto, ChatGPT, Claude and Gemini most often named Canalizador 24h (72% of answers), Desentupimentos 24 Horas (50%) and SOS Canalizador (31%). Across 36 answers they named 31 different businesses, 17 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.

Plumbers in Porto named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1Canalizador 24hAlso written Canalizador Porto 24h, Canalizador Porto 24H, Canalizações Porto 24H, Canalizadores Porto 24h, Canalizador 24 PortoIs this your business?72%95%: 56 to 84%100%33%83%4 of 41.1
2Desentupimentos 24 HorasAlso written Desentupimentos Porto 24H, Desentupimentos Porto 24 Horas, Desentupimentos Porto 24hIs this your business?50%95%: 35 to 66%83%33%33%4 of 42.4
3SOS CanalizadorAlso written SOS Canalizações Porto, SOS Canalizador PortoIs this your business?31%95%: 18 to 47%8%8%75%4 of 43.1
4Reparações PortoIs this your business?22%95%: 12 to 38%0%0%67%3 of 42.4
5FixandoAlso written Canalizadores PortoIs this your business?17%95%: 8 to 32%0%25%25%3 of 42.8
6ZaaskIs this your business?14%95%: 6 to 29%0%42%0%3 of 42.2
7Canalizador PortoAlso written Canalizador Porto - Serviços RápidosIs this your business?14%95%: 6 to 29%8%8%25%2 of 43
8OSCARAlso written Oscar App, OscarAppIs this your business?11%95%: 4 to 25%0%33%0%3 of 41.8
9Reparações 24 HorasAlso written Reparações 24h Porto, Reparações 24 Horas PortoIs this your business?11%95%: 4 to 25%0%0%33%2 of 42.3
10Canalizador UrgenteAlso written Canalizador Urgente Porto, Desentupimentos Porto - Canalizador UrgenteIs this your business?11%95%: 4 to 25%8%8%17%3 of 42.5
11HomeServe PortugalIs this your business?8%95%: 3 to 22%0%25%0%2 of 41.3
12Canalizadores do NorteIs this your business?8%95%: 3 to 22%0%0%25%2 of 44.3
13Canalizador ExpressoAlso written Canalizador Express Porto, Canalizador Expresso PortoIs this your business?6%95%: 2 to 18%8%8%0%2 of 43
14Multiserviços PortoIs this your business?6%95%: 2 to 18%0%0%17%2 of 44

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. 17 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.

Check your businessNamed above? Add the badgeWhat the audit does

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
1Canalizador 24h100%Zaask42%Canalizador 24h83%
2Desentupimentos 24 Horas83%Canalizador 24h33%SOS Canalizador75%
3SOS Canalizador8%Desentupimentos 24 Horas33%Reparações Porto67%
4Canalizador Porto8%OSCAR33%Desentupimentos 24 Horas33%
5Canalizador Urgente8%Fixando25%Reparações 24 Horas33%

Claude named no business in 2 of its 12 answers.

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: Plumbers in Porto, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/plumbers/porto"><img src="https://aigrow.gg/badges/index/2026-09/plumbers/porto.svg" width="312" height="100" alt="Named by AI assistants: Plumbers 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. 1Quem é o melhor canalizador no Porto?Who is the best plumber in Porto?
  2. 2Tenho um cano a pingar na minha casa no Porto. A que empresa de canalização devo ligar?I have a leaking pipe at home in Porto. Which plumbing company should I call?
  3. 3Preciso de um canalizador de urgência no Porto esta noite. Quem me recomendas?I need an emergency plumber in Porto tonight. Who would you recommend?
  4. 4Que canalizador no Porto escolherias para substituir um esquentador?Which plumber in Porto would you trust to replace a water heater?

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

Plumbers elsewhere
LisbonBelo HorizonteRio de JaneiroSão PauloAarhusAmsterdam
Also in Porto
DentistsLawyersAccountantsGymsReal estate agenciesRestaurants

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