This site provides a simple web service to generate text-based CAPTCHAs. These tell humans and robots apart by asking a simple logic question. These questions are aimed at a child's age of 7, so can be solved easily by all but the most cognitively impaired users. As they involve human logic, such questions cannot be solved by a robot.

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Tofu is a novel application to address the common problem that people don't like reading text on the screen.

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