When comparing Lean FT vs BugBug.io, the Slant community recommends BugBug.io for most people. In the question“What are the best test automation tools for web apps?” BugBug.io is ranked 14th while Lean FT is ranked 20th. The most important reason people chose BugBug.io is:
You are able to group the steps in tests into reusable components to manage and repair them easier. As a bonus, you can see all test flows on a single project graph.
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Pros
Pro It helps move testing closer to the development cycle
It's very easy to go between UFT and LeanFT. Whoever is used with UFT can easily become very productive with LeanFT too, but with the added benefit of moving the testing closer to the development cycle.
Pro Reusable components
You are able to group the steps in tests into reusable components to manage and repair them easier. As a bonus, you can see all test flows on a single project graph.
Pro Great UI & UX
A design for a high efficiency
Pro Debuggability
You can run tests and debug directly from a Chrome browser, where you have access to DevTools.
Cons
Con May have some stability issues
Since it's still a (relatively) new product, it may very well have some stability issues, which are sure to be fixed in the future though.