What AI tools answer when a business looks for a way to bill subscriptions

Three names above half, with the first appearing in four out of five responses

Asaas appears in 79 of the 99 responses, Iugu in 62, and Vindi in 60. There are 19 percentage points from first to third. The drop comes after that, from third to fourth place, Stripe, at 38. In total, 16 different platforms are cited, adding up to 345 mentions.

Appearing is one thing; being named first is another

AI almost never answers with just one system: it averages 3.6 names per response. That is why where a name appears matters as much as appearing at all. Asaas is named first most often, with an average place of 1.9. Chargebee is at the other extreme: it appears in 10 responses and enters at 5.4th on average, after the reader has already seen other names.

This column separates the top three because they are close in presence. All three appear; only one is named first.

Each tool has its own ranking

The same platform changes in size depending on where the question is asked. Iugu is the strongest case: it appears in 88% of ChatGPT responses and 44% of Google responses. That is a 44-point gap between its best and worst tool. For anyone outside the top positions, this means there are tools where they can compete and tools where they cannot.

Being read by AI almost guarantees being cited by it

In 63 of the 99 responses, it is possible to see which sites the tool consulted. There were 92 different sites, and the most used of all is iugu.com, Iugu’s site, in 15 of the 63. Among the ten most used, 9 are sites of the systems measured and 1 is external, such as mercadopago.com.br.

What the tool reads also appears in what it writes: when the platform’s site was consulted, its name appeared in the response 94% of the time. When it was not consulted, the name appeared in 16%. It is worth separating what appears in the text without competing for subscription management: Cielo, InfinitePay, Mercado Livre, Mercado Pago, PagBank, PagSeguro and Stone are acquirers and banks. They were measured and remain outside the table: they sell card terminals and accounts, not subscription management. The case of Mercado Pago stands out: it is written in 40 of 99 responses, more than any measured platform outside the top three, because nearly every question touches on a payment method.

Three other names cited by AI are also excluded for a different reason: they do not sell what this page compares. Celcoin (6), Cora (4) and Pacto (3) appear in responses, but the first is banking infrastructure for financial-product builders, the second is a digital bank with billing as an account feature, and the third is gym-management software included because of the question about collecting student monthly fees. They were measured by the same standard and are disclosed here so readers do not look for them in the table.

On the broadest question, the top three are tied

The 25 questions were written in four slices: general recommendations, customer niche, feature, and informational. In the broadest slice—the 20 responses to people simply asking for the best platform— Asaas and Iugu appear in 85%, with third place at the same level. People arriving through the generic question consistently receive the same three names.

The picture changes when the question narrows, and that is this page’s most useful finding for anyone outside the top positions. In the customer-niche slice, second and third fall to around half, while names appearing nowhere else rise into the list. Asking ‘which platform for a school’ or ‘for an internet provider’ returns a different set of responses than asking which is best.

How we measure

• We asked the 25 questions in 4 tools, once each, in September 2026. That would yield 100 responses; we retained 99. In Perplexity, 24 of 25 were retained: one capture failed. Each question was asked in a clean window, in a temporary conversation without history, from an IP in Brazil. We saved every screenshot.
• No question names a platform. All ask for recommendations, as someone looking to bill customers would ask.
• We count only when AI writes the platform’s name in the response. When the name appears only in the list of sites consulted, it does not enter this count: that is something else, measured separately in section 04.
• We count only what the tool wrote. Site cards, videos and map listings around the response are excluded because AI is not choosing the name there.
• The names in the table came from the responses themselves. We did not begin with a ready-made list, so no outside platform ‘should’ be there: if it was not cited once, it does not appear.
• Each name is counted separately, even when two rows belong to the same company. The table shows the name as AI wrote it. Where the same company is written in two forms, it occupies two rows because that is how it reaches those reading the response.

What this study does not say

• Nothing about service quality. What is measured is what AI tools answer, not which system is best to use or who charges less.
• Nothing about how much each thing is searched. The 25 questions reflect how people ask, not a sample weighted by search volume.
• Nothing about what AI answers for you. Responses vary with the preceding conversation, region and day. This is a September 2026 snapshot in a clean window.
• Nothing about how to change this result. This material measures; it is not an action plan.

The 25 questions, in full

Original Portuguese research evidence, preserved as recorded.

1. 01qual a melhor plataforma de cobranca recorrente para empresa
2. 02me indique um sistema de assinatura e cobranca recorrente
3. 03qual gateway de pagamento recorrente tem o melhor custo beneficio
4. 04qual o melhor sistema de cobranca recorrente em 2026
5. 05plataforma de cobranca recorrente que vale a pena contratar
6. 06qual plataforma de cobranca recorrente para escola e mensalidade
7. 07melhor sistema de cobranca recorrente para academia e estudio
8. 08qual plataforma de cobranca para clube de assinatura
9. 09melhor sistema de cobranca recorrente para clinica e consultorio
10. 10qual plataforma de cobranca recorrente para provedor de internet
11. 11melhor cobranca recorrente para software b2b com contrato mensal
12. 12qual plataforma de cobranca recorrente para mei e profissional autonomo
13. 13qual plataforma de cobranca recorrente faz pix automatico
14. 14melhor plataforma de cobranca com split de pagamento
15. 15qual plataforma de cobranca tem subconta para marketplace
16. 16melhor sistema de cobranca que faz retentativa automatica de cartao
17. 17qual plataforma de cobranca recorrente emite nota fiscal junto
18. 18melhor plataforma de cobranca recorrente com carne e boleto
19. 19qual plataforma de cobranca recorrente tem a melhor api para desenvolvedor
20. 20melhor sistema de cobranca recorrente para recuperar inadimplencia
21. 21quanto custa uma plataforma de cobranca recorrente por transacao
22. 22como trocar de plataforma de cobranca sem perder assinante
23. 23vale a pena usar plataforma de cobranca ou integrar direto com o banco
24. 24o que uma plataforma de cobranca recorrente precisa ter
25. 25existe plataforma de cobranca recorrente sem mensalidade fixa