Had to read the documentation to see that serving the comments-widget one time consumes 1 credit, but sending a single email-notification consumes 15.

It seems very "expensive" to send emails.

Looks like a cute product, and the pricing mechanism is interesting. Good luck.

(I wrote some a simple self-hosted system, far less featureful, but it seems popular enough - http://github.com/skx/e-comments/ )

Thanks for the link to your system. Is there a demo instance somewhere?

Yeah, emails are quite expensive. AWS itself charges $100 per 1 million plus additional infrastructure to manage subscriptions + email validation & dealing with bounces.

Therefore, email notifications are an optional feature. I hope in the future push notifications will be supported much better by the browsers so that it won't make sense to use emails.

There used to be a demo, but the site the comments were designed for is now defunct so it was removed.

It would be cool if you could add a "Deploy to Heroku" button or similar. Or at least screenshots. I think it would be nice to see how the UI looks like.