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Co–Star Review

Co–Star is an astrology application that provides personalized horoscopes and birth chart insights using NASA data and a natural-language engine.

shipped Sep 16, 2026researchpaid
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Co–Star — product screenshot

Why it matters

1Founded in 2017 by Banu Guler, Ben Weitzman, and Anna Kopp.
2Utilizes NASA data for astronomically accurate birth chart calculations.
3Over 30 million registered users, primarily Millennials and Gen Z.
4Features 'The Void' service, launched in July 2023, for open-ended astrological questions.

About Co–Star

Platforms
iOS, Android

Screenshots

overview

What is Co–Star?

Co–Star is an AI-powered astrology tool developed by Banu Guler, Ben Weitzman, and Anna Kopp that enables individuals to receive personalized astrological insights and social features. It generates personalized natal (birth) charts using NASA data based on a user's exact birth date, time, and location, combining this with professional astrologer methods to generate interpretations.

features

Key Features of Co–Star

Co–Star integrates several distinct features to provide a comprehensive astrological experience, leveraging AI and real-time astronomical data. These features cater to both individual self-discovery and social interaction within the app.

  • AI-Powered Personalization: Utilizes AI to analyze NASA data and generate personalized birth charts and daily horoscopes.
  • Social Astrology Network: Allows users to connect with friends, view their natal charts, and analyze relationship compatibility.
  • "Day at a Glance" Notifications: Delivers precise daily suggestions and push notifications known for their blunt and humorous tone.
  • "The Void" Feature: An in-app service introduced in July 2023 where users can ask open-ended questions and receive astrologically informed answers.
  • Astronomical Accuracy: Employs real NASA data for precise planetary positions, ensuring the accuracy of birth chart calculations.
  • Natural-Language Engine: Combines NASA data with professional astrologer methods to generate interpretations.
  • Real-time Insights: Provides up-to-date astrological information as planetary positions change.
  • Friend Tracking: Enables users to track friends' astrological insights and compare charts.

use cases

Who Should Use Co–Star?

Co–Star is designed for individuals seeking personalized astrological insights and a social platform to explore compatibility with friends. Its target demographic primarily includes Millennials and Gen Z individuals, particularly women aged 18-32, interested in self-discovery and social connection through astrology.

  • Individuals seeking personalized natal birth charts based on birth date, time, and location.
  • Users interested in receiving AI-powered daily horoscopes and insights tailored to their birth chart.
  • People who want to compare astrological compatibility and charts with friends for social interaction.
  • Those looking to gain a deeper understanding of themselves and personal context for daily life through astrology.
  • Users aiming to facilitate meaningful conversations and social connections through shared astrological insights.

how to use

How to Use Co–Star

To begin using Co–Star, users download the application from the iOS App Store or Google Play Store and provide their birth details. The app then generates a personalized birth chart and daily astrological insights.

  • 1Download the Co–Star application from the Apple App Store or Google Play Store.
  • 2Create an account and input your exact birth date, time, and location for accurate natal chart generation.
  • 3Access your personalized daily horoscopes and birth chart analysis.
  • 4Add friends to compare astrological compatibility and view their charts.
  • 5Utilize features like "The Void" to ask specific astrological questions (may involve payment).

pricing

Co–Star Pricing & Plans

Co–Star operates on a freemium model, offering core features without cost. The application is free to download and provides access to personalized birth charts, daily horoscopes, friend charts, and compatibility analysis. Premium features, such as "The Void" service for asking specific questions, are available as in-app purchases.

  • Free Tier: Includes personalized birth chart generation, daily horoscopes, friend charts, and compatibility analysis.
  • Premium Features: In-app purchases for additional services like "The Void" (specific pricing varies per question).

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Pros

  • +Utilizes real NASA data for astronomically accurate birth chart calculations.
  • +Offers unique social features for comparing astrological compatibility with friends, fostering engagement.
  • +Features a distinct, minimalist design and a 'brutally honest' interpretive style that resonates with users.
  • +Provides AI-powered personalized daily horoscopes and in-depth birth chart analysis.
  • +The 'The Void' feature allows for asking open-ended questions, expanding personalized insights.

Cons

  • −Some professional astrologers view AI-generated interpretations as 'surface-level' compared to full natal chart analysis.
  • −Users have reported issues with 'The Void' feature, including questions not being answered after payment.
  • −In-app purchases for premium features can be expensive.
  • −Focuses heavily on Sun, Moon, and Rising signs, potentially overlooking other complex astrological factors.

Similar Tools

Co–Star vs Competitors

Co–Star distinguishes itself in the astrology app market through its unique blend of AI-powered personalization, social features, and a distinct brand voice. Its integration of NASA data for accuracy and its minimalist design have resonated with a younger demographic.

1
The Pattern↗

Provides deep personality analysis and relationship compatibility insights in accessible psychological language, without requiring astrological vocabulary.

While Co–Star offers direct, sometimes cryptic, daily insights and social sharing, The Pattern focuses on in-depth psychological profiles and relationship dynamics, often without using astrological jargon.

2

Connects users with professional human astrologers, tarot readers, and psychics for live, on-demand readings.

Unlike Co–Star's AI-generated interpretations, Sanctuary offers direct interaction with human experts, providing a more personalized and conversational experience for specific questions.

3
CHANI↗

Provides weekly readings, guided meditations, and journal prompts with a warm, introspective tone, focusing on astrology as a tool for self-inquiry and personal growth.

While Co–Star offers direct, sometimes cutting, daily insights and social features, CHANI emphasizes a more meditative and reflective approach to astrology, with a focus on personal growth and less on social compatibility.

4
TimePassages↗

Offers detailed natal charts, transits, progressions, and synastry with in-depth interpretations written by experienced astrologers, providing a more professional-grade astrological toolkit.

TimePassages provides a much deeper and more technical astrological analysis than Co–Star, which is better suited for serious students of astrology who want to understand the mechanics behind the interpretations rather than just receiving bite-sized insights.

5
Amora: A Hint of Your Soulmate↗

Focuses on soulmate discovery, providing AI-generated soulmate sketches, love profiles, and compatibility analysis based on astrological data.

While Co–Star offers general compatibility with friends, Amora specializes in in-depth romantic compatibility, including unique features like AI soulmate sketches and love profiles, making it more focused on relationship astrology.

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