The Smart Siddur gives you the Prayers of each day. For Example, on Rosh Hodesh it displays Yaleh Ve'yavo and Halel, while on regular days it doesn't. In addition, it has a great user interface, and it's the most easy to use Siddur application in the market. Tfilot included. Shacharit. Mincha. Arvit. Birkat HaMazon. Days included. Rosh Hodesh, Passover, Sukot. Fasts.