The subscription-based program is mostly designed for parents and kids and doesn't include a teacher dashboard for managing students and monitoring their progress. It does allow kids to practice at home with a Common Core-aligned program, though, and you can encourage parents to take an active role in their kids’ math progress by following along on the website.

Continue reading**Editor's Note: StraightAce has closed and is no longer available.**

*StraightAce *is an app offering a traditional middle school math curriculum with a modern wrapper. Kids log in and then choose from three grades and any of hundreds of topics. They'll then elect to study a lesson or launch right into a quiz with about 10 questions each. Press buttons for a hint, virtual scratch paper, or to send a message to a parent via the website. If kids select an incorrect answer, an unhappy face spins into view along with a (sometimes empty) explanation field, the answer, total percentage of students who got it right, and a button to see the question again.

Hundreds of topics focus on sixth-, seventh-, and eighth-grade concepts such as ratio, fractions, negative numbers, geometry, representing data, square roots, irrational numbers, and exponents. The StraightAce Link website allows parents to see kids' topics completed, number of questions answered, total time spent, lessons reviewed, and overall success.

Menus and graphics are crisp, and navigation is mostly intuitive. Earned coins, a three-star system, and positive messages will encourage kids to keep trying here.

Unfortunately, the lessons, questions, and explanations suffer from wordiness, occasional ambiguous descriptions, and technical, textbook-like language, not to mention formatting problems like missing line breaks and varying font sizes. Chronically low global success percentages displayed after every question might also be discouraging; if no one's getting the answer right, maybe the questions aren't so great.