Which tool your team designs, tests and documents APIs in
Summary
As of Aug 16, 2026, the market’s strongest steer is Postman — followed by Swagger and Insomnia.
The engines name 11 of the 20 products measured here — the other 9 are never mentioned in an answer.
Postman is also the most searched for by name on this board.
“The AI-native API Platform” — their words · Aug 14, 2026
The rest of the board, ranked by what the market says — every score’s receipts one click away.
Why it ranks here →
- AI answersnamed by Claude, Gemini, Google's AI Mode and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand126,400 searches a month by name
Why it ranks here →
- AI answersnamed by Claude, Google's AI Mode and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand14,920 searches a month by name
Why it ranks here →
- AI answersnamed by Claude, Gemini, Google's AI Mode and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand27,100 searches a month by name
Why it ranks here →
- AI answersnamed by Google's AI Mode and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand91,000 searches a month by name
Why it ranks here →
- AI answersnamed by Claude, Gemini and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand22,660 searches a month by name
Why it ranks here →
- AI answersnamed by Google's AI Mode and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand210 searches a month by name
Why it ranks here →
- AI answersnamed by Claude and Google's AI Mode
- Search resultsnot in the top results where buyers search
- Buyer demand33,100 searches a month by name
Why it ranks here →
- AI answersnamed by Gemini
- Search resultsnot in the top results where buyers search
- Buyer demand4,990 searches a month by name
Why it ranks here →
- AI answersnamed by Google's AI Mode and Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
Why it ranks here →
- AI answersnamed by Google's AI Overview
- Search resultsnot in the top results where buyers search
- Buyer demand90 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand14,800 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand12,100 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand4,710 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
Why it ranks here →
- AI answersnot named in AI answers
- Search resultsnot in the top results where buyers search
- Buyer demand0 searches a month by name
What the engines say
Verbatim, from the answers themselves. We quote what an engine said and when it said it — never a paraphrase, and never our summary of it.
“Open-source options like Hoppscotch and Insomnia also offer collaborative workspaces, but require balancing cloud features against pricing or self-hosting needs.”
Google's AI Overview on Hoppscotch · Aug 16, 2026
“Insomnia - A REST client that's clean and intuitive, with good support for environment variables, request chaining, and GraphQL.”
Claude on Insomnia · Aug 16, 2026
“Apache JMeter - Better for load testing and performance testing at scale. cURL - The command-line classic for simple API testing, though less user-friendly than GUI tools.”
Claude on JMeter · Aug 16, 2026
“It is best for developers who prioritize data privacy and want to store API collections as plain-text files directly inside a Git repository without cloud lock-in. - Insomnia by Kong is a clean, developer-first API client.”
Google's AI Mode on Kong · Aug 16, 2026
“However, here are some of the most popular and highly-regarded options: API Development & Testing Tools: Postman - One of the most popular, with a user-friendly interface, collections, mock servers, and automated testing capabilities.”
Claude on Postman · Aug 16, 2026
“Functional and Performance Testing Specialists: * SoapUI (SmartBear): A widely used open-source tool specifically designed for functional and performance testing of SOAP and REST APIs.”
Gemini on SoapUI · Aug 16, 2026
Engines asked for this category: Claude, Gemini, Google's AI Mode and Google's AI Overview.
Check it yourself
Ask ChatGPT about this market →
You will not get our answer back, and you should not expect to. A single reply varies by the day, the account and the wording; the board is what several engines named across a fixed set of buying questions, recorded over time. What you can check is the part that matters — whether the products we say the engines name are the ones you are shown.
What decides a position
Four signals, chosen because a vendor cannot buy any of them directly. Each is a measurement of what the market does, not of what a company says.
What AI engines answer when buyers ask what to use for a job.
Where the product stands in the search results buyers actually see for the category’s buying queries — including who owns the answer box.
How many buyers search for the product by name.
Whether the product is gaining or losing ground against the others in its market, measured between dated captures rather than claimed.
A product is scored on the signals we could actually measure for it, and a signal we could not measure is left out rather than counted as zero. This is not a quality rating and not a recommendation. It measures how present and how well-regarded a product is across public surfaces — a different question from whether it is right for you.
Cite this
Free to quote, with attribution. Add your own accessed date if your style needs one — the date below is when we measured, which is the one that decides whether a number is still current.
The Lytms Index. "Which tool your team designs, tests and documents APIs in." Lytms AI. Measured Aug 16, 2026. https://lytms.ai/best/api-development
Prefer the numbers? Download the API development tools board as CSV — every row and every evidence line exactly as shown above, nothing extra.
Markets next to this one
Related because the rosters overlap, which is a fact about the products we track rather than a judgment about the markets. Each row says how much.
2 of these 20 products also appear on that roster — Workato and Zapier.