Curveu lets you manage your grades like mint.com manages your money. It also aims to be a platform for users to develop educational tools that help them succeed in middle school, high school, or college and beyond. Curveu is currently compatible with Infinite Campus, PowerSchool, Blackboard, and Brainhoney. Compatibility with Moodle is coming soon. All a student or parent has to do is sign up and enter their system's username and password.
Curveu also has iOS apps and Android apps