This is Good.

This is awesome, I was thinking of building an app very similar to this using Redis' GeoSet functionality to power it. Bravo!

Pros: Really fast, efficient, works like it's supposed to. Cons: Not much! Perhaps a little more functionality would make it a better experience. Here's some suggestions: Themes / custom themes, images, groups. Great job maintaining the web app! I hope you're not too mad, but I'm really glad you fixed it overnight (overnight for me)! I think sanitizing any possible inputs from a customer should be a priority especially if it's online. I noticed you prevented scripts to be run so props for that. Anyways, really cool idea!

useful for students!

@vsnthv I love this and it amazing...is it open source yet?

Nice work :)