Quizlet is an online memorization tool that was originally created by then 15 years old Andrew Sutherland.

The tool was created by Andrew in his sophomore year of high school when his French teacher gave him a list of 111 french-to-english animal vocabulary to learn, after finding it hard to approach, he decided to create a systematic way to learning a vocabulary, after he built the prototype, showed his friends who used it which resulted in everyone doing well on their test, he only had one thing in mind, taking it beyond a prototype, and then Quizlet was born in October 2005.

In November 2009, Dave Margulius who worked with Sutherland as an investor and advisor for Quizlet since 2007, was named CEO of Quizlet. Sutherland would remain the President of Quizlet and CTO. In addition to hiring CEO Dave Margulius, Sutherland also announced the opening of Quizlet's office in San Francisco which would hold his small team of employees which work on Quizlet every day.

In January 2010, Quizlet announced that they had hired their first full-time developer and product manager, Phil Freo. Andrew Sutherland, the creator of Quizlet said "I'm very excited about this because Phil is a talented developer and can really help step up the pace of innovation at Quizlet."

In February 2010, Quizlet launched "Quizlet Plus", which gives the user the ability to upload and add their own images to their flash cards to study. This option also gives the user to create unlimited groups and have no ads. But there is a cost to this at a price of $10.

In March 2010, Quizlet launched a new design of the set page. The goal of the new design was to make the set page more intuitive and more visually appealing. The major change that the site made to the set page was to get rid of the Familiarize mode and build it right into the set page itself. After the new design was launched an update was made to add a button that will shuffle the flashcards that are built into the set page.