Tfilon is a free siddur that shows the prayers correct to the Hebrew date (Yaale Ve'Yavo on Rosh Chodesh, Al Ha'Nisim on Chanuka and Purim) without using the phone's internet. All time and date calculations are done in the phone itself!
אורי הולנדר is the developer of the tool which can be found in the Books & Reference category. The most recent update of the app was launched on Oct 18, 2020 and this application was downloaded by over 0,5M users. On Google Play, Tfilon has been rated 4.7 by its users.