Incredibly students love working on math facts when a "best of list" is at stake! The Math Drills app allows for profile creations by students that creates an achievement list of all tests taken. It shows their progress throughout the year.
We do not work on math facts every day, but work them in when five minutes are available.
This is a paid app, but I believe is the best app for math facts for grades four and up!
The list of accomplishments.
Students are able to personalize the look of the screen.