Is the "Reverse speech" app compatible with the Mac OS?
No, the software is not compatible with Mac OSX. I have searched all the possible websites, and found out that the application is listed as being available for iPhone only.
The software was listed some time ago for Windows 7, but since then there have been no mentions or updates.
You can check the iPhone version here: https://itunes.apple.com/us/app/reverse-speech/id753357884?mt=8