Ask HN: Review my Project: SpellingThing

Hi All, I'm looking for some feedback on my web app, SpellingThing, a tool to help people improve their spelling. It's targeted at teens and adults (it seems like most spelling programs are targeted at kids). It's populated with EN-US words only (for now).

I'd love to hear what you think. What's confusing? What doesn't work for you? What's missing?

If people start using it and getting value out of it, I'd like to switch to a freemium model, so I'd appreciate any feedback in that direction too.

http://www.spellingthing.com/