Quizlet is a mobile and web-based study application that allows students to study information via learning tools and games. Its creators claim that it is currently used by two-thirds of high school students and half of university students in the United States.[3] It was created by Andrew Sutherland in October 2005 and released to the public in January 2007.[4] Quizlet trains students via flashcards and various games and tests. As of February 6, 2019, Quizlet has over 300 million user-generated flashcard sets and more than 50 million active users.[5] It now ranks among the top 50 websites in the U.S.[6] In 2016, Quizlet was recognized by SimilarWeb as the fastest growing US Education site in 2015.[7]

Quizlet logo
Screenshot of the website's homepage (not logged in).
Type of site
Available inEnglish, German, Spanish, Chinese (Traditional and Simpified), Japanese, Korean, Portuguese (BR),[1] Polish, Russian, French, Quebec French, Indonesian, Dutch, Italian, Turkish, Vietnamese
San Francisco, California
Area servedSelect locations in the world
OwnerQuizlet Inc.
Founder(s)Andrew Sutherland
Key people
  • Matthew Glotzbach (CEO)
RevenueFreemium (ads/subscriptions)
Alexa rank 238 worldwide, 49 in the U.S. (February 2019)[2]
LaunchedJanuary 17, 2007 (2007-01-17)


Quizlet was conceptualized by Sutherland while he was memorizing animal names for his French class.[8][9] To aid in memorizing words, he began writing a program to help him study.[10] These first lines of code were deleted and then rewritten over a course of 420 days. In October 2005, Quizlet was released to the public.[11]

Until 2011, Quizlet shared staff and financial resources with the Collectors Weekly web site.[12] In 2015, Quizlet announced raising $12 million from Union Square Ventures, Costanoa Venture Capital, Altos Ventures and Owl Ventures to expand its digital study tools and grow internationally.[6]

In 2011, Quizlet added the ability to listen to content using text-to-speech.[13] In August 2012, Quizlet released an app for the iPhone and iPad and shortly afterward released an app for Android devices.[12]

On April 29, 2015, Quizlet enabled HTTPS on their site.[14].

On August 10, 2016, Quizlet introduced a revamp to their website with a new design interface, along with a new logo and homepage. Their mobile apps for iOS and Android also received a design interface update.[15]

On August 23, 2017, Quizlet introduced a new diagramming feature[16] to help learners with subjects heavy on visuals like geography, vocabulary, anatomy, and architecture.

On February 6, 2018, Quizlet announced that it had raised an additional $20 million in Series B funding,[17] led by Icon Ventures.

On October 31, 2018, Quizlet announced the opening of their second office, which was located in Denver[18].

Study modes and games

As a memorization tool, Quizlet lets registered users create sets of terms and definition customized for their own needs.[19] These sets of terms can then be studied under several study modes.[20][21]

Flash Cards
This mode is similar to paper flash cards. Users are shown a "card" for each term, which they can flip over by clicking or using the arrow keys or space bar.[22] The user has the option for the face of the card to be an image, a word, or both.
In this study mode, definitions scroll vertically down the screen in the shape of asteroids. The user must type the term that goes with the definition before it reaches the bottom of the screen. It is one of the 'Play' study modes.[23] Gravity was adapted from a previous game, Space Race. The user can pick the level of difficulty and game type.
In this study mode, users are shown a term or definition and must type the term or definition that goes with what is shown. After entering their answer, users see if their answer was correct or not, and can choose to override the automatic grading and count their answer as right if needed. This mode was previously called "Learn."
Long-Term Learning
In this study mode, users are given a recommended study set based on whether or not they answer study set questions correctly. Repetition of terms answered incorrectly increases in frequency and a dashboard shows learning progress over time. The mode uses spaced repetition concepts to focus on longer-term retention and subject mastery versus shorter-term memorization.[24]
In this mode, the term is read out loud and users must type in the term with the correct spelling. If the user gets every answer correct, they are rewarded with a video of a monster truck doing a jump, wheelie, and a flip. [22]
In this study mode, users are presented with a grid of scattered terms. Users drag terms on top of their associated definitions to remove them from the grid and try to clear the grid in the fastest time possible. Micro-match is a related matching game geared towards mobile devices and devices with small screens. Users may access the Micromatch mode on non-mobile devices by manually editing the URL in Match mode to use "micromatch" instead of "match".[22] Match was previously attributed as "Scatter". Though the name of the study mode changed, the game itself did not.
In this study mode, a Quizlet user with a Teacher upgrade (usually a teacher) breaks their class up into teams of however number of teams they want. The teacher chooses whether to start with a definition or term. Each team will have to choose the correct term/definition to win, with the team that has the most points winning. If the teacher decides to shuffle the teams, the groups are randomly put into new teams. This game works by choosing a set of flashcards and putting these flashcards into a format which works for the game.


Quizlet provides an API that allows others to access Quizlet data. Available functions include uploading and downloading flashcards, modifying users' flashcards, and finding definitions created by Quizlet users.[25]

See also


  1. "Quizlet in other languages - Quizlet". Quizlet.
  2. "Quizlet.com Traffic, Demographics and Competitors - Alexa". www.alexa.com. Retrieved February 21, 2019.
  3. "A new milestone for Quizlet: 50 million monthly learners". Inside Quizlet blog. Retrieved February 8, 2019.
  4. "QUIZLET". The Innovation Economy, presented by Intel, in partnership with the Aspen Institute, PBS Newshour. Retrieved January 29, 2013.
  5. Quizlet Mission Page.
  6. Kolodny, Lora (November 23, 2015). "Quizlet Raises $12 Million to Take Its Popular Study Tools International". Retrieved November 23, 2015.
  7. "SimilarWeb Digital Visionary Awards: 2015". SimilarWeb. January 21, 2016. Retrieved February 18, 2016.
  8. Tynan, Dan. PC World. (March 9, 2008) "Meet the Whiz Kids: 10 Overachievers Under 21".
  9. The Morning Show with Mike and Juliet.
  10. "QUIZLET: Join millions and Build Your Own Flashcards, Game Yourself to Smart". SF New Tech. November 2010. Retrieved January 29, 2013.
  11. MIT / "Quiz Yourself"].
  12. "Quizlet's Growth Puts It on the Top of the Edtech Stack". EdSurge. November 2012. Retrieved February 8, 2015.
  13. "Quizlet Now Offers "Speller" Mode in 18 Languages". Free Technology for Teachers. July 2011. Retrieved February 1, 2015.
  14. "Quizlet is now 100% secured with HTTPS". April 29, 2015.
  15. "Meet the new Quizlet". Retrieved August 10, 2016.
  16. "Introducing Quizlet Diagrams". Quizlet Blog. August 2017. Retrieved August 28, 2017.
  17. Roof, Katie. "Quizlet raises $20 million for virtual flash cards". TechCrunch. Retrieved February 26, 2018.
  18. "Quizlet is coming to Denver". Quizlet. Retrieved November 1, 2018.
  19. Wendy Boswell. Life Hacker. (January 28, 2007) "Practice your vocabulary with Quizlet".
  20. Barbara Feldman. The Boston Globe (November 26, 2010) .
  21. "What are the different ways I can study my flash cards?". Archived November 3, 2009, at the Wayback Machine Quizlet FAQ.
  22. "Engagement for Memory: Try Quizlet". Jeanne Farrington. October 2014. Retrieved February 1, 2015.
  23. "Quizlet Raises $12M Series A". VentureTracker. Retrieved November 23, 2015.
  24. "Announcing Quizlet's first funding round and what's next for us". quizlet.com. Retrieved November 23, 2015.
  25. "Quizlet Flashcards API". Retrieved May 2, 2017.
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