You can try out a running demo of this app here.
The Rails app contains one
Comment, that validates with a
correct textcaptcha logic answer (on create). It is configured with a
file that sets a few options and includes fallback questions (in the event
of a failed API request).
To identify calls to the API (at textcaptcha.com) the
TEXTCAPTCHA_API_IDENTIFIER ENV variable must be set. If you are deploying with
Heroku's one-click button, this will be auto-generated for you.
For more information on the acts_as_textcaptcha gem and how to configure it, see the links below.