Chose Usersnap
I haven't used anything else. I just used email and Google Docs before and that's hard to keep straight what you are talking about within a document to what it actually is on the website. Also, more phone calls are required to explain what you mean and need.
Independently Invited by TrustRadius
A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info

