[fadeyev]

Thanks for the feedback! Glad you're finding it useful.

Name should be pronounced like "Use Aura" but without a gap. It's a play on the word Aura, combined with User, or Usability, as the heatmap is a bit like an aura.

There are a couple of angles I see for a paid version:

1) Beef up the features by adding more tests types (e.g. a preference test like: "Which do you like more: A or B?" -- like a poll but visual) and more customisation (e.g. ability to chain tests together, easy way to compare test performance for iterations, priority in the public test pool etc.).

2) Hook it up to Amazon's Mechanical Turk and basically get instant outsourced testers. Perhaps you can even do some demographic filtering here, although I don't have any experience with Amazon Turk yet. This option can probably tie in with 1) since the single page tests right now are probably too simple to pay for--you'll want to get more value out of each one, so getting a chain of tests with comments will make more sense.