Are you looking for an easy to use, collaborative whiteboard app that works on all tablets, phones, AND computers? Check out AWW: a web whiteboard (https://awwapp.com). Recommended by Sarah Davis in Teacher Education (EHHP), it allows you and your students to collaborate through drawing. Sarah used it to online tutor her niece in math. It’s great for writing, math, brainstorming, anything that can be done by drawing or writing.
It also couldn’t be easier to use if it had to be. Just go to https://awwapp.com and click Start Drawing. Once in the board just share the link with your users via email or a tweet and you’re on your way to collaboration.