Thank you for making your first post on the forums!
I have been using my Oticon CROS system for a while now. The phone app works fine, and I have not had any issues with mine. I have an Android phone.
With that said, I don't use my phone app a lot. The settings my audiologist set for me seem to work most of the time. It's easier for me to press the little button on my Oticon for which program I need at the moment than it is to pull out my phone, put in the password, pull up the Oticon app, and then make the adjustments there. So, in my opinion, I probably would not make a decision on which CROS system to purchase based solely on having a phone app available.
To me, the most important factor is finding a good audiologist who can recommend what CROS system he/she thinks would work best for you and then adjust it according to your specific needs.
Finding a good audiologist is a challenge, and I have moved recently and need to find a new one for my checkup.
One of the things I appreciated about my former audiologist is that while she used a Phonak for her own hearing issues and had Phonak advertising and displays in her office, she told me she recommended Oticon for my own specific needs. I did not feel that she was trying to 'push' the brand she used herself nor the brand she sold the most hearing aids. I felt like she did try to take my needs into consideration. An audiologist you can trust is worth their weight in gold. And that, to me, is what is really important. I actually chose that audiologist because I had done a lot of reading on the different CROS systems, and I was going to go with a different brand (not Oticon nor Phonak), and her office carried the brand I wanted. That's why I went to her (whereas some of the other audiologists nearby did not carry that brand). But after speaking to her, she explained why she felt the Oticon was a better choice for my particular situation. And it made sense, so I went with her recommendation.
So, I am not going to recommend an Oticon to you caryng because that's what I use. Instead, I want you to have whatever works best for you.