What are some alternatives?
When comparing Async and Approval Studio, you can also consider the following products
Slack - A messaging app for teams who see through the Earth!
ReviewStudio - ReviewStudio is an online proofing software built for easy collaboration on review and approval workflows, for all your image, video, web pages and PDF based projects.
Axosoft - Axosoft is proprietary software for project management.
ProofHub - ProofHub is an online project management software that helps you to plan, collaborate, organize and deliver projects.
FireRTC - FireRTC is the easiest way to call from your computer for free
Workgroups DaVinci - Project management and workflow automation software for marketing and creative teams.