Co-Star

Co-Star

AI-powered natal astrology and social app

Overview

Co-Star is a mobile app that delivers highly personalized daily horoscopes by building a full natal chart from a user’s exact birth data and combining NASA planetary positions with insights from human astrologers, processed through a proprietary AI engine. It updates daily with readings, offers personality analysis, and lets users connect with friends to compare compatibility, making astrology a social experience. In 2023 it launched The Void, an in-app feature that provides AI-generated answers to user questions based on their chart. The app uses a freemium model, offering premium chart readings and extended Q&A options, aimed at reducing loneliness by fostering daily reflection and connection through digital wellness and social networking around astrology.

About Co-Star

Simplify's Rating
Why Co-Star is rated
B-
Rated B on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

Data & Analytics

Consumer Software

AI & Machine Learning

Entertainment

Company Size

11-50

Company Stage

Series A

Total Funding

$21M

Headquarters

New York City, New York

Founded

2017

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Simplify's Take

What believers are saying

  • Co-Star reported 4.3 million monthly active users in Bloomberg on July 24, 2026.
  • Midjourney says Co-Star keeps Banu Guler’s control and gains expanded resources.
  • The July 2023 Void feature proved monetizable AI depth beyond basic horoscopes.

What critics are saying

  • Midjourney bought Co-Star on July 24, 2026; Co-Star becomes a side project.
  • Competitors like Chani, The Pattern, and Zodia attack its social-astrology niche.
  • Birth-chart data and AI outputs create trust and privacy exposure, inviting user backlash.

What makes Co-Star unique

  • NASA JPL data plus human astrologers power Co-Star’s personalized charts.
  • Co-Star turns astrology into a social network around friends’ compatibility.
  • Banu Guler’s design-led product creates a distinctive blunt, high-retention voice.

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Funding

Total Funding

$21M

Meets

Industry Average

Funded Over

3 Rounds

Series A funding typically happens when a startup has a product and some customers, and now needs funding to scale. This money is usually used to grow the team, expand marketing, and improve the product. Venture capital firms are frequently the main investors here.
Series A Funding Comparison
Meet Average

Industry standards

$15M
$8.2M
Discord
$15M
Canva
$15M
Co-Star
$30M
Kalshi

Benefits

Health Insurance

Vision Insurance

Dental Insurance

401(k) Retirement Plan

401(k) Company Match

Unlimited Paid Time Off

Paid Vacation

Parental Leave

Stock Options

Equity Grants

Wellness Program

Mental Health Support

Conference Attendance Budget

Professional Development Budget

Remote Work Options

Hybrid Work Options

Family Planning Benefits

Fertility Treatment Support

Phone/Internet Stipend

Home Office Stipend

Meal Benefits

Mentorship Program

Education Allowance

Training Programs

Tuition Reimbursement

Adoption Assistance

Employee Discounts

Company Social Events

Exercise Benefits

Pet Insurance

Bereavement Leave

Relocation Assistance

Commuter Benefits

Legal Services

Performance Bonus

Profit Sharing

Employee Stock Purchase Plan

Growth & Insights and Company News

Headcount

6 month growth

-2%

1 year growth

-2%

2 year growth

-5%
TechCrunch
Jul 24th, 2026
Midjourney acquired the astrology app Co-Star.

Midjourney acquired the astrology app Co-Star. Midjourney, an AI lab best known for its LLM-powered image and video generators, has acquired the social astrology app Co-Star, according to Bloomberg. The deal terms were not disclosed. Co-Star, which reportedly has about 4.3 million monthly active users, is mostly used to help people determine their astrological birth charts, which they can then share with other friends on the app. Co-Star uses both AI and humans to write horoscopes, compatibility assessments, and other advice based on a user's astrological information. Midjourney seems to be casting a wide net when it comes its product lineup. The company seems almost synonymous with the Discord server where users can generate text and images - there is no stand-alone Midjourney app - yet the AI lab is also trying to build a medical arm and spa. Why not throw an astrology app in the mix? Co-Star's team of two dozen employees has joined Midjourney as part of the acquisition. Given the team's experience in building consumer apps, Midjourney could perhaps finally get its own stand-alone app. October 13 - 15 San Francisco Scale faster. Grow your portfolio. Gain practical expertise. No matter your goal, Disrupt can empower you. Save up to $330 today!

Bloomberg
Jul 24th, 2026
AI startup Midjourney acquires astrology app Co-Star, plans first standalone image app

Midjourney has acquired astrology app Co-Star and is developing its first standalone image-generation application. The artificial intelligence startup's moves represent its latest push into new business areas following an announcement last month about ambitious expansion plans. The acquisition of the popular astrology app marks a significant diversification for Midjourney, which has primarily focused on AI-powered image generation. Details about the acquisition terms were not disclosed. The company is simultaneously working on its own image-generation app, expanding beyond its current offerings. These strategic developments signal Midjourney's broader ambitions to establish presence across multiple consumer-facing product categories.

Reporter.am
Apr 6th, 2025
J-Star Holding Co. Ltd. $6M IPO

J-Star Holding Co., Ltd. (YMAT) plans to raise $6 million in an IPO the week of April 14th, issuing 1.3 million shares at $4.00-$5.00 each. The company, with a market cap of $76.6 million, generated $18 million in revenue and $1.9 million in net income over the past year. Maxim Group is the underwriter. The IPO size was reduced to 1.25 million shares to raise $5.63 million, with Maxim Group as the sole book-runner, replacing EF Hutton.

Bustle
May 23rd, 2023
The Co-Star Astrology App Has A New AI-Powered Feature

Astrology app Co-Star launched a new in-app AI feature that allows you to ask the stars personalized questions and it will provide answers based on your birth chart.

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