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Co–Star app icon
Co–Star screenshot
Co–Star screenshot
Initial releaseOctober 17, 2017; 3 years ago (2017-10-17)
Operating systemiOS, Android
Available inEnglish
TypeAstrology and social networking
LicenseProprietary software
Co–Star Astrology Society
  • Astrology
  • Social networking
FoundedOctober 17, 2017; 3 years ago (2017-10-17)
FounderBanu Guler
HeadquartersNew York City

Co–Star is an American astrological social networking service founded in 2017 and headquartered in New York City. Users enter the date, time and place they were born to receive an astrological chart and daily horoscopes that they can compare to those of their friends.[1]


Founder and CEO Banu Guler came up with the idea for the app after she gifted a friend's child an astrological chart that became a surprise hit at the baby shower.[2] In 2019, Co–Star raised a $5.2 million seed round from Maveron, Aspect, and 14W, following a $750,000 pre-seed from Female Founders Fund in early 2018.[3][4][5] In January 2020, Co–Star for Android was launched to a 120,000 person waitlist – two years after their iOS app was launched.[5] As of February 2020, Co–Star has been downloaded by 15% of American women aged 20 to 24, and counted 7.5 million registered users as of January.[6]


Co–Star employs artificial intelligence (AI) to analyze publicly accessible NASA JPL data and find patterns in a user’s transits.[7] Co–Star’s algorithm maps human-written snippets of text to planetary movements to display personalized content for each user.[4] That content has been called “slightly robotic,”[8] “wildly beautiful,”[4] “truly insane,"[9] “brutally honest,”[7] and compared to “a free therapy session.”[10]


  1. ^ Hess, Amanda (January 1, 2018). "How Astrology Took Over the Internet (Published 2018)". The New York Times. ISSN 0362-4331. Retrieved October 13, 2020.
  2. ^ Noble, Audrey. "What's Co-Star? Meet the Astrology App That's Intriguing Millennials Everywhere". Vogue. Retrieved October 13, 2020.
  3. ^ "Co-Star raises $5 million to bring its astrology app to Android". TechCrunch. Retrieved October 13, 2020.
  4. ^ a b c Bryant, Kenzie. "How Astrology App Co–Star Conquered the Millennial Lock Screen". Vanity Fair. Retrieved October 13, 2020.
  5. ^ a b Meisenzahl, Mary. "One of the internet's favorite horoscope and astrology apps is now on Android after over 120,000 fans begged for it". Business Insider. Retrieved October 13, 2020.
  6. ^ Velasco, Haley (February 20, 2020). "Why Astrology Apps Are Rising". Wall Street Journal. ISSN 0099-9660. Retrieved October 13, 2020.
  7. ^ a b EDT, Janice Williams On 8/3/19 at 10:17 AM (August 3, 2019). "Co-Star is more than just an astrology app, it's a community". Newsweek. Retrieved October 13, 2020.
  8. ^ Jones, Allie (October 4, 2019). "Inside Co—Star, the smartest (and meanest) astrology app out there". The Verge. Retrieved October 13, 2020.
  9. ^ "How To Destroy Your Friends Emotionally With Astrology Memes". BuzzFeed News. Retrieved October 13, 2020.
  10. ^ "Android Users Can Finally Get in on Co-Star's Brutally Honest Horoscopes". Gizmodo. Retrieved October 13, 2020.

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