Bulughul Maram is the latest and most complete

a glimpse of the fast section:

From Abu Hurairah Radliyallaahu 'anhu that the Prophet Shallallaahu' alaihi wa Sallam said: "Do not go ahead of Ramadhan by fasting a day or two, except for those who are accustomed to fast, then may he fast." Muttafaq Alaihi.

Ammar Ibn Yasir Radliyallaahu 'anhu said: Whoever fasting on a dubious day, he has been rebellious to Abdul Qasim (Muhammad) Shallallaahu' alaihi wa Sallam Hadith mu'allaq the history of Bukhari, Imam Lima rated maushul, while Ibn Khuzaimah and Ibn Hibban rated the hadeeth shahih.

Ibn Umar Radliyallaahu 'anhu said: I heard the Messenger of Allah Shallallaahu' alaihi wa Sallam said: "When you see it (moon) fast, and when you see it (moon) break, and if cloud cover you then estimate it." Muttafaq Alaihi. According to Muslim history: "If the cloud covers you then estimate thirty days." According to Bukhari's narration: "Make it count to be thirty days."

every part of this app contains some of the hadiths in it

 fiture:

-wipe offline / no internet connection

- small file size

-can be used in different versions of android