In Donald S. Whitney's excellent Praying the Bible book (Crossway, 2015), Whitney introduces a superb, systematic approach for praying through Scripture called "Psalms of the Day." Since there are 150 psalms in the book of Psalms and most months have at least 30 days, you can read through all 150 psalms in a month by reading five per day. You start by taking today's day of the month and reading the corresponding psalm, then keep adding 30 until you get your five psalms. On the 31st day of the month, you read Psalm 119 only. You quickly scan those five psalms then pick the one that best leads you to prayer at that moment.
This app was inspired by Whitney's "Psalms of the Day" prayer approach. Instead of having to do the math each day and manually flipping to each psalm in a physical Bible, this app automatically looks up today's date, does the math, and displays for you the exact five psalms for the day. You can read through a psalm by swiping up and down, and switch to a different psalm by swiping left and right.
You can also display the Proverbs chapter of the day, customize the look and feel of the Scripture text, and customize what happens on the 31st day of the month (show Psalm 119 or five random Psalms).