When comparing Katalon Studio vs Puppeteer, the Slant community recommends Puppeteer for most people. In the question“What are the best headless browsers for testing?” Puppeteer is ranked 2nd while Katalon Studio is ranked 7th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Works great with modern node.js features
Pro Runs a real browser
Unlike the other options here, this is a real browser, just without the GUI parts. This means the quality of the test is much higher, and lets you do things like save to PDF or images.
Pro Actively developed and promoted by Google
Pro Complete API for Chromium included
Chromium tests depend on the same API that Puppeteer gives you access to, so all the features are included
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".
Con Slow sometimes
Con Not good for Cross Browser Tests
Since it only tests via Chromium, it won't help you test inconsistencies between browsers like Edge or Safari. There are projects to get around this, but they aren't mature.