BitMessage is in dire need of a complete external audit. If you're a professional researcher able to review the open source code, please contact the lead developer directly. By getting involved with the development of this free software, you'll be helping to build a better privacy option for all of us! Not just for yourself, but also others! By downloading the application and checking to see if it's secure, you can get a sense of whether or not it's something that you might want to use to keep in touch with friends or family.
Once you're done with your assessment, you can then get started with your initial testing, by installing it on your computer and giving it a try. There is no limit to the number of times you can do this, and it will let you gauge how much security the software has and how well it interacts with the Mac operating system. This will give you a good picture of what you can expect to get out of using the application. After you've given the software a try and have determined that it's secure enough to be downloaded, you can then decide whether or not you want to buy it.
The cost is very low compared to other programs that require a subscription, like PGP and iProtocol, so there's really no reason why you shouldn't download and test the free version. By doing so, you will help to ensure that the application works as intended on your Mac, ensuring that everyone can safely download it and use it without fear of spyware, malware, viruses, or even identity theft!
