Go ahead and buy this! It worked wonders on the approval process, super frictionless, does not require them to signup or login. Check this out:
https://mysoftwareadviser.com/articles/how-make-clients-give-feedback-design-or-website-picter

I'm already using this for clients so here's a few suggestions for the Picter team
🌮 built in screen capture for websites (right now I use markuphero to do the screencapture, download and then upload in Picter)
🌮 show old versions (version control)
🌮 square, circle and other shapes annotation, instead of just the freehand brush tool
🌮 For uploaded videos, it still says reject IMAGE
🌮 accept SOUND FILES

So why 5 tacos, Mike??
🌮 pricing for a lifetime is a no brainer up to 25 team members
🌮 uploading PDFs separates each page as an "image" for people to comment on
🌮 accepts videos (really frictionless for reviewers and the team)
🌮 they just released task assignment, Inbox links (create a space for your collaborators to upload files with a simple drag and drop.), Presentation Link
🌮 connect Slack if you don't want email notifications

Still not convinced?? Go ahead and try this link
https://workspace.picter.com/r/brsfE9o6

Cheers,
Mike
MySoftwareAdviser.com