Postman was named in all 6 of 6 answers when we asked ChatGPT and Gemini for the best API testing tools. No other product came close: Apidog, Insomnia and SoapUI tied for second at 4 of 6 answers each, and Bruno followed at 3 of 6.
On 4 August 2026 we put six buyer questions about API testing tools to ChatGPT and Gemini, each with one live web search, and recorded every product named and every source domain behind the answers. Twenty different products came up across the six answers. Only Postman appeared every time, and more than half of them, 11 of the 20, showed up in just one of the six answers.
The shortlist changed with almost every question
The six questions read like variations on one request, but the answers were not. Only Postman survived all six. The bare "best api testing tools" question returned eight names: Postman, Insomnia, SoapUI, Bruno, Apidog, Hoppscotch, HTTPie and RestAssured. Two of those, HTTPie and RestAssured, appeared in that one answer and nowhere else in the six.
Ask for "best free" instead and the list moves. The free question also returned eight names, and ReqBin showed up only here, in 1 of 6 answers, next to Postman, JMeter, Hoppscotch, Bruno, Insomnia, SoapUI and Apidog. Ask for "most affordable" and the list moves again, down to five names: Postman, Katalon Studio, ACCELQ, Gatling and StackHawk. Gatling and Katalon Studio each appeared in that one answer only.
The most useful number here is the overlap between "best free" and "most affordable." To a person those two questions mean almost the same thing. To the assistants they did not: the two answers shared exactly one product, Postman. The other seven free tools and the four paid-but-cheap tools never crossed over. A vendor tracking only the word "free" would miss the entire "affordable" answer, and the reverse.
The "small teams" cut brought its own names. SmartBear ReadyAPI and Katalon each appeared only in the small-teams answer, 1 of 6. "What api testing tools should I use" was the only place Keploy came up, also 1 of 6. And "api testing tools recommendations" was the only question that surfaced Swagger UI, Karate DSL and API Fortress, each once.
Katalon is worth a note on how the counting works. The brand was named in two of the six answers, but under two labels: "Katalon" in the small-teams answer and "Katalon Studio" in the affordable answer. Because they are written differently, they sit as two separate rows of 1 rather than one row of 2, and we are leaving them split because that is what the assistants actually returned. For a vendor the lesson is plain: an inconsistent product name splits your citations in half.
The answers came from two places above all
Two domains fed all six answers: reddit.com and openapi.com, each cited in 6 of 6. Community discussion and one roundup site were, between them, in every answer. After those, servicenow.com appeared in 4 of 6, and three domains tied at 3 of 6: accelq.com, stackhawk.com and virtuosoqa.com.
Community threads carried real weight. Reddit was in every answer, 6 of 6. Quora and LinkedIn each appeared once, 1 of 6. That is the pattern we keep seeing across these categories: the assistants lean on places where practitioners argue about tools, not only on vendor marketing.
The review directories barely registered. G2 was cited once, in 1 of 6 answers, and Capterra did not appear at all. If a plan to get recommended by AI rests on a G2 rating, this category says that plan is thin: G2 fed one answer out of six, while the biggest single sources were a Reddit thread and the openapi.com roundup, at 6 of 6 each.
The key insight: vendor pages were cited, and those vendors got named
Here is the part worth acting on. Several vendors' own domains fed the answers, and in each of those cases the vendor's product was named. Postman's own site, postman.com, was cited in 2 of 6 answers, and Postman was named in all 6. StackHawk's own site was cited in 3 of 6, and StackHawk was named in 2. ACCELQ's own site was cited in 3 of 6, and ACCELQ was named in 2. SmartBear's site and ReqBin's site each fed 1 answer, and SmartBear ReadyAPI and ReqBin were each named once.
Set that against the directories. accelq.com and stackhawk.com each fed 3 of 6 answers, while G2 fed 1. In this category a vendor's own clearly written pages were cited three times as often as the biggest review directory. The assistants were willing to quote the source itself, not only the aggregator, and the source got the citation.
What a vendor in this category would actually do
The source list decided who got named, not market share. So the move is simple to state: be present, in a form that can be quoted, in the exact places these six answers pulled from. That means a Reddit presence that survives being cited (used in 6 of 6 answers), a spot in the roundups that recur here (openapi.com in 6 of 6, servicenow.com in 4 of 6, virtuosoqa.com in 3 of 6), and your own docs and comparison pages written clearly enough to be quoted directly, the way postman.com, accelq.com and stackhawk.com were.
It also means watching more than one query. Postman aside, no product held the whole list. Measure only the bare "best" question and you would never learn that your tool appears under "affordable" but vanishes under "free," or the reverse. The 11 products that each appeared in a single question are exactly the ones a one-question check misses.
Where Glotier fits, and where it doesn't
Glotier is not an API testing tool, so it is correctly absent from all 6 answers. We did not name ourselves and the assistants did not either, which is the honest result. We are showing you this category because the measurement behind it is exactly what we do for a customer: we run your buyer's real questions through ChatGPT and Gemini, record who gets named and which sources fed each answer, and show you where the gap is. Postman turns up in 6 of 6 here because it is everywhere buyers look. Most vendors have never checked whether they show up at all.
If you sell in a category like this one, the same check runs on yours. It is free, needs no account, and takes about a minute.
The full list, counted
| Product | Named in | Share |
|---|---|---|
| Postman | 6 of 6 | 100% |
| Apidog | 4 of 6 | 67% |
| Insomnia | 4 of 6 | 67% |
| SoapUI | 4 of 6 | 67% |
| Bruno | 3 of 6 | 50% |
| ACCELQ | 2 of 6 | 33% |
| Hoppscotch | 2 of 6 | 33% |
| JMeter | 2 of 6 | 33% |
| StackHawk | 2 of 6 | 33% |