When comparing Insomnia vs Katalon Studio, the Slant community recommends Insomnia for most people. In the question“What are the best REST API Clients?” Insomnia is ranked 1st while Katalon Studio is ranked 8th. The most important reason people chose Insomnia is:
Response content and headers are presented in an accessible and readable format. JSON responses is prettified and can be filtered for for closer inspection.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Detailed information about response
Response content and headers are presented in an accessible and readable format. JSON responses is prettified and can be filtered for for closer inspection.
Pro Plugins
e.g. Swagger validator.
Pro Can generate code
Generates code for more than 30 languages, including Curl, NodeJS, Go, Swift, Python, Java and C.
Pro GraphQL support
Pro Valuable Features
Pro CI tools
CI tools available for e.g. Jenkins and Teamcity.
Pro SOAP and REST
Supports both SOAP and REST testing.
Cons
Con Does not support nested shadow root DOM structure
Con Not for desktop applications
Currently Katalon Studio supports Web, Mobile, and API automation testing.
Con Heavy file to download
Con No free version anymore
Despite promises made of "being free forever".