When comparing eggPlant Function vs Sikuli Slides, the Slant community recommends eggPlant Function for most people. In the question“What are the best generic (image based) GUI functional test frameworks?” eggPlant Function is ranked 2nd while Sikuli Slides is ranked 6th.
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Pros
Pro One of the most feature complete
Pro Text recognition
eggPlant Function uses OCR technology to recognize text in images. It also supports different languages including Russian and Chinese.
Pro Open source
Sikuli slides is free and open source. The source code is hosted on GitHub and is freely distributed under the MIT license.
Cons
Con Unknown yearly subscription fee
Although there's a free trial, in order to be able to use eggPlant Functional fully you need to pay a yearly subscription fee which is not clear and nor is it available on the site. You need to contact the eggPlant team to get the price information.