Using Planbook has made lesson plan writing so simple and quick. I used to spend hours writing lessons, especially if my schedule changed unexpectedly. Bumping and yanking lessons in Planbook saves time. Jeff Hellman provides the fastest response to questions Ive ever encountered for ANYTHING! I use it on my Mac, then upload using Dropbox to access it from other devices. It works wonderfully on my iPad as well. I use my iPad at work so I dont have to print out pages and pages of plans. If I need a sub, I just upload that days lesson onto our substitute finder website. Would highly recommend Planbook if you want to reclaim your life from hours of lesson planning.