Pattern App?

✭✩ 𝔼 𝕃 𝕃 ✩✭ • •••>•Mother of 2 girls•Silent Miscarriage 2009 and four chemical pregnancies since 2019 • Baby # 3 due February 2023<•••

What is it? Can you only get it on Apple? I have an Android. But have heard the app is crazy spot on. I'm curious about it and if anyone has used it. 😊