AlexDawson, sorry for silence and thanks for your reply.
I took a look at GS but they provide api access for $289/month. At this moment it's little expensive for me
So I made my choice for BetaEasy. It has ability to integrate feedback button into software and I'm going to implement this feature soon. I'm using BetaEasy for little more than two weeks and found it's support fast and helpful enough.