Existing application [Web/Flutter/Android/IOS] - Write Alphabets and Numbers in Any Language. Children can learn how to write the alphabets and numbers

This is a sample application reference, I am looking for something same.

https://play.google.com/store/apps/details?id=com.sathishshanmugam.writeenglishalphabetsandnumbers&hl=en_US&gl=US

Share me your application reference link or images or video in the chat.