Show HN: Lathoa, a math app for kids where the AI is wrong on purpose

Lathoa is a math learning app for ages 10-14 that teaches critical thinking by having an AI character named Errol intentionally solve problems with one hidden mistake per case. Kids earn "detective ranks" by identifying the error and explaining why it's wrong in their own words, emphasizing the valuable skill of spotting flawed reasoning rather than just finding correct answers. The app offers a free tier with three daily cases and paid subscription options, with no ads or data harvesting.