HappyKey is a free iPhone app designed by Alex Baratti, offering a simple keyboard with various math symbols. This educational tool caters to math enthusiasts, providing access to numbers, superscripts, pi, math operators, relations, infinity, and more.

Moreover, HappyKey seamlessly integrates with Happy Grader, a PC application available at happygrader.com. This collaboration enhances the grading process for teachers by automating it through Google Forms and Microsoft Excel. Students can conveniently input math test answers using HappyKey, ensuring uniformity across responses. To enjoy the benefits of HappyKey, users need to install the app and configure the keyboard settings via Settings > General > Keyboard > Keyboards > Add New Keyboard > HappyKey.