The Code for Love and Heartbreak by Jillian Cantor

Emma Woodhouse is a genius at math, but clueless about people. After all, people are unreliable. They let you down—just like Emma’s sister, Izzy, did this year, when she moved to California for college. But numbers…those you can count on. (No pun intended.)

Emma’s senior year is going to be all about numbers, and seeing how far they can take her. When she and George, her Coding Club co-president, are tasked with brainstorming a new project, The Code for Love is born—a matchmaking app that goes far beyond swiping, using algorithms to calculate compatibility. George disapproves of Emma’s idea, accusing her of meddling in people’s lives. But all the happy new couples at school are proof that the app works. At least at first.

Emma’s code is flawless. So why is it that perfectly matched couples start breaking up, the wrong people keep falling for each other and her own feelings defy any algorithm? Emma thought math could solve everything. But there’s nothing more complex—or unpredictable—than love.