![]() The success of the app suggests they were on to something. While not psychologists, the foursome were curious to see if they could improve online dating by using mathematical algorithms. Over time, this transformed into its own app and was renamed OkCupid. SparkNotes had a cool feature: fun personality tests and quizzes. The four co-founders met at Harvard in 1999 when they created SparkNotes. ![]() ![]() Prices range from $17.50 to $45 per month.
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