What are some alternatives?
When comparing SideComments.js and Sidenotes, you can also consider the following products
Nofanity - Nofanity removes swear words from YouTube videos
Genius Beta - Annotate the Internet
Carnival - Carnival Mobile offers a suite of Mobile Marketing Engagement and Analytical Tools. Get the best in creative, location-based mobile marketing.
Thought Train - Stop using sticky notes to remember what you're doing 📒 🚫
Hidy - Auto hide unwanted social comments (FB, Instagram)
Whimsical Sticky Notes - Visual project management using sticky notes