Star ratings are vague. Five stars could mean “changed my life” or “I stayed up until 2am.” They don’t tell Kyra which of two five-star books you’d actually reach for. This or That does.
We show you two books from your Read shelf. You click the one you liked better — then we immediately show the next pair. No confirmation, no loading screen. Just the next choice.
There’s no skip button and no tie option. That’s intentional. Forced decisions reveal preference in a way that optional ones never do. When you’re genuinely torn, you still have to choose — and that tension is the signal.
We don’t show you random pairs. The system is always working out which matchup will teach it the most — prioritising books with similar scores (where the outcome is genuinely uncertain) and books that haven’t been compared much yet. Maximum information per choice, not maximum choices.
After each choice, both books update using the stack ranking system. A book that beats a higher-ranked opponent gains more ground than one that beats a lower-ranked one. Over time your library self-sorts into a precise rank that captures not just what you liked, but how much, and relative to what.
You gave five books five stars. Kyra knows you liked all of them, but she has no idea which you’d actually reread, which you’d press into a friend’s hands, or which you barely remember. Every five-star book looks the same.
Kyra sees a precise preference order across your entire Read shelf — built from real choices under real pressure. She knows which books matter most to you, and she weights every new recommendation accordingly.
Free to use. No credits, no AI calls. Just you, two books, and a forced decision. The more you play, the more precisely Kyra knows your taste.
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