Pocket Luach
Calendar function is very good, although you have to play with it a little to understand all its functions. It has Zmanim for most major cities for prayer times (like earliest and latest times for Shema). It is a bit slow loading. It has Mincha, Maariv, and Shacharit prayers if you are in a pinch. Not as good as a Siddur, but helpful when the Siddur is at home. I gave it a 4 stars, but it is arguably 5 stars, given how inexpensive it is. Part of my problem with it is that the Siddur does not allow scaling to a bigger size, for people like me who do better with larger print. It also does not shift when the IPOD is held horizontally. Minor quibbles. Maybe a 4 1/2 star app?
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Pocket Luach - The Jewish Calendar (siddur, zmanim)