Kriterin is a free website that helps people examine partner preferences through statistics rather than intuition. Its calculator estimates how many adults in Türkiye may match a combination of criteria, such as height, age range, or education. The estimates draw on official population and demographic data alongside research on factors including income, habits, and physical traits. Where criteria are related, the site says it models those connections rather than simply multiplying independent percentages. Results are presented as estimates that illustrate scale, not as exact measurements.

The site also offers a daily guessing game based on statistics from Türkiye and around the world. Players receive directional and “warmer or colder” clues, with the answer and its source revealed at the end of the day; scores can contribute to streaks and a leaderboard. With Flörtünü Test Et, users can build and share a personal compatibility questionnaire by link. Respondents see their match percentage, while individual answers are visible only to the questionnaire creator.