Similar to Flinto? https://www.flinto.com/
Looks promising. Though it would be a great start, I hope it goes beyond basic sliding transitions. Looking forward to it!
Yeah, the first thing I noticed about every transition in the video is that. Slideshow essentially, hopefully it's high on the list to add other transitions, then... new video.
This looks awesome.
Can't wait to give it a try.
Video introducing Briefs for Mac and iOS.