What are some alternatives?
When comparing Mightytext and Zeplin, you can also consider the following products
Pamela for Skype - A versatile and easy to use Skype audio and video recording software. Features
Invision - Prototyping and collaboration for design teams
Abstract - A secure, version-controlled hub for your design files
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
ActiveWords - Other Collaboration
Framer - Bring your designs to life.