Update to my previous post a couple of weeks ago (https://news.ycombinator.com/item?id=49661638). Feedback for that run was brutal and constructive, so thought it would be good to follow up.

The Viva is live – that was the "coming soon" feature from before. Once you have completed a concept's diagnostic, you will have a live voice conversation with the AI where it will ask follow-up questions and make you defend your reasoning orally as opposed to selecting a response. Finishing the conversation correctly will trigger an evaluation as opposed to just discarding the session.

Other issues addressed from the feedback:

The diagnostics were incorrectly rejecting short, verbatim answers (e.g. "mutex") – they were simply being flagged for an AI evaluation as a result of their brevity. Fixed. A few lessons were suffering from bad math formatting and some off-topic material making its way in due to the generation prompt – issue resolved. The mobile navigation was hiding the review controls – issue resolved. There is a feedback form on the homepage now rather than asking people to send an email.

Free, nothing priced yet. The thing I really want to find out is if it really does feel any different from taking a quiz, as the Viva is the ultimate proof of this because it’s much more difficult to fake knowledge in conversation. Wonder if it works for people who have tried it.