https://t.me/NatashaCalendarBot/CalendarApp
(source: https://github.com/dordje21/WomensCalendar-Natasha/commit/7bc99a5a854f40be3fb8e954fdd4e10ef7991a11)

WomensCalendar-Natasha is a 🥼 women's period and ovulation tracker app functioning as a mini app on Telegram 📲. It allows users to keep track of their menstruation cycle 📅 and predict ovulation dates, all through a user-friendly 👩‍💻 and intuitive interface. There are also some funny advices from bot natasha in main page

Here are some screenshots

Nice idea, I would also like to see the UI transforms into a more native-like Telegram theme.