I've been looking for a product that does this for over a year! Toybox is very low-friction to get started, and when I use it to send feedback to team members they instantly understand my feedback. Can't wait to see the new features as they release them.
Toybox is a nice way for my co-worker and I to bounce things back and forth without getting up and disrupting each other, or sharing screenshots over and over. We're just getting started with it but I'm excited to see how it changes our workflow.
Very easy to use for a technologically challenged person (me) who wants to edit the visual identity of a site clearly and share that with people able to make those edits reality.