I really like it. An "Ignore rule" button would be nice. If you're trying to demonstrate a strong vocabulary in your paper, you might not ever want simpler word

I really like it. An "Ignore rule" button would be nice. If you're trying to demonstrate a strong vocabulary in your paper, you might not ever want simpler words. (I chose that rule in particular because you seem to have made that rule too aggressive. A passage of solely simple words, while possibly more clear, is not as pleasant to read.) Your suggestions don't always actually fit, but that's true of certain large, expensive pieces of software (Microsoft Word) too. Also, allowing people to upload files (at least text files, maybe rtf and doc if you can parse them into text) might be nice so they don't have to select and paste it all. Overall it looks like a very useful site though.