Comparison

Knowe Astro:Birth Chart vs Synastry

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Knowe Astro:Birth Chart

This app generates detailed natal charts, synastry comparisons, and transit readings. It offers AI-powered interpretations and includes a built-in astrology library for in-depth study. Ideal for both beginners and experienced astrologers seeking a clear workspace.

Highlights
  • Accurate natal and birth charts
  • Synastry and compatibility analysis
  • Transit tracking and timing
  • AI chart interpretation
  • In-app astrology library
  • Detailed placement study
Features
Read full description

Knowe Astro is a precise, focused workspace for people who want to understand natal charts, relationships, and transits beyond a generic horoscope. Enter a birth date, exact time, and place to create a complete chart. Read its overall structure, open every planet, sign, house, and aspect, save the people who matter, and move through time to follow changing transits. - A CLEAR, PRECISE BIRTH CHART Calculate planets, angles, houses, and aspects from the birth data and see the chart's essential structure in one readable view. - SYNASTRY AND COMPOSITE CHARTS Compare two charts through synastry to understand their astrological connections. Use a composite chart to explore the central themes of the relationship itself. - TRANSITS THROUGH TIME Change the date to inspect the planetary positions at that moment and the contacts they form with the natal chart. - AI INSIGHT GROUNDED IN THE ACTUAL CHART Generate an overall or monthly reading for the selected chart. The content is shaped by its specific astrological data rather than a generic Sun-sign template. - DETAILS THAT KEEP THEIR CONTEXT Open planets, signs, houses, and aspects one by one while keeping degrees, conditions, and relationships connected in the same reading flow. - ASTROLOGY LIBRARY AND HOME SCREEN WIDGETS Read classic astrology books inside the app and use Home Screen widgets to check current transits for the selected profile at a glance. Whether you are learning to read your first chart or already study astrology regularly, Knowe Astro gives you a calm, clear environment for going deeper. The transit timeline, in-depth chart details, widgets, and saved charts beyond the free limit require Pro or Ultra access. AI readings require an Ultra subscription. By using this app, you agree to Apple's Standard End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Synastry

Features
Read full description

Synastry: Your Personalized Astrology App for Real-Time Insights The Synastry app analyzes your astrological birth chart and calculates the planetary aspects happening right now. Our advanced features allow you to: Receive notifications about new transits affecting your chart. Understand the meaning of each transit and its potential effects. View details about the duration of each planetary aspect. Important Note: Synastry is designed for users already familiar with astrology and planetary aspects. It does not offer generalized predictions for your zodiac sign on a monthly or weekly basis. Instead, it provides a highly personalized experience by monitoring the planetary landscape tailored specifically to you. Synastry provides a new way to explore your connection to the cosmos, with a beautiful and intuitive user interface inspired by the creative ideas and visualizations of Ginno Dizon.

Screenshots

Knowe Astro:Birth Chart4 screens
Synastry4 screens

Verdict

The call

The clearest difference is in-app purchases: Synastry at none against Knowe Astro:Birth Chart's 4. Knowe Astro:Birth Chart's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Knowe Astro:Birth Chart sells 4 in-app purchases, starting at $4.99 per month. Synastry asks for nothing beyond the download.

UpkeepUpdate frequency

Knowe Astro:Birth Chart ships an update every 4 days, Synastry every 6 days. The most recent releases landed on September 29, 2026 and October 13, 2026 respectively.

Scorecard2 real differences · 7 level
Knowe Astro:Birth Chart versus Synastry: the parameters behind the verdict, then further details
ParameterKnowe Astro:Birth ChartSynastry
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 4 days — betterEvery 6 days
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.0 — better18.6
Further details — not scored
Size22 MB15 MB
Age rating4+4+
Developer占辉 百Tryfon Stergiou

In-app purchases

4 purchases

Knowe Astro:Birth Chart

Subscriptions4
  • Monthly Pro Membership$4.991 Month
  • Monthly Ultra Membership$6.991 Month
  • Yearly Pro Membership$19.991 Year
Show 1 more
  • Yearly Ultra Membership$29.991 Year
None

Synastry

No in-app purchases

Questions

Is Knowe Astro:Birth Chart free?
Knowe Astro:Birth Chart is free to download, with in-app purchases available.
Is Synastry free?
Synastry is free to download, with no in-app purchases.
Do Knowe Astro:Birth Chart or Synastry have ads?
Synastry shows ads; Knowe Astro:Birth Chart does not.
Which is updated more often, Knowe Astro:Birth Chart or Synastry?
Knowe Astro:Birth Chart ships an update every 4 days, and Synastry every 6 days. Most recently, Knowe Astro:Birth Chart was updated on September 29, 2026 and Synastry on October 13, 2026.

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