What AI recommends for Transactional email APIs

How AI answers when a developer asks which transactional email API to use to send email from a SaaS product. We asked ChatGPT, Claude, Gemini and Perplexity the same five buyer questions and counted, from their own answers, who gets named, who gets recommended first, and who is left out. Every number links to the verbatim answer.

Recorded 2026-06-29 · earlier methodologyHow we measured this

Company	Named in	Recommended first	State
Postmarkincumbent	19/20	19/20	Named first most often
Mailgunincumbent	18/20	18/20	Named first most often
Amazon SESincumbent	15/20	15/20	Named first most often
SendGridincumbent	15/20	15/20	Named first most often
Resend	8/20	8/20	Named first most often
Brevo	4/20	4/20	Named, less often first
MailerSend	2/20	2/20	Named, less often first
Mailtrap	2/20	2/20	Named, less often first
Loops	0/20	0/20	Named, less often first

Sorted by how many of the 20 buyer conversations named each company, then by how often it was named first. Counts only, no score.

What Bersyn measures

Recorded answers, not a score

For a market like Transactional email APIs, Bersyn asks the buyer questions people actually ask, across ChatGPT, Claude, Gemini and Perplexity, several times each — then reports how many of those recorded answers named each company, which other companies were named, and what the assistants cited. Every count keeps its denominator.

Bersyn is being rebuilt around verified measurement, and self-service purchases are closed while that work is in progress.

See where Bersyn is now

Read how we measured this