I made something like this for my girlfriend. She uses it for school. It's not very polished, but it may work for your needs or give you some ideas.

notecard.herokuapp.com

You can create an account (no email verification necessary). Your first step is to create a semester, then a section, then you create notecards. The notecards flip front to back with a single click. You can also put your notecards in a "Known" or "Unknown" pile so you know what you have to study.

edit: The notecards also support HTML