Comparison

Planetary Guide vs Synastry

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

Head to head
About

Planetary Guide

Features
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Daily Planetary Guide showing exact timing of transits for selected locations / timezones (additional timezones can be added on request. This app provides all the information that you would expect in a daily planetary guide to assist with finding the best time for opportunities. Includes many techniques used by Mundane astrologers. Planetary Guide provides: - exact transit timing (to the minute) of planets, including retrogrades and ingresses - choice of either tropical or sidereal zodiacs defaults - variety of default locations / timezones to choose from - full /new moons, solar /lunar eclipse - retrogrades, ingresses and outer planet transit for extended periods - current longitude of planets and for the sidereal zodiac navamsha and nakshatra for each planet is included - current longitude by degree - this assists users to identify planets at close degrees, planets combust Sun or planets about to leave a sign - current aspects with orbs - current aspects to midpoints - ephemeris tables - longitude and declination - 30 and 45 degree graphical ephemeris - 2 options: All planets - 15 days, Outers - 90 days - annual retrogrades - eclipse dates for a 1 year period - aspects to new and full moons - 30 days prior and post selected date - moon void of course for next 30 days - 2 heat maps - current for the next 20 days and biannual for the next 180 days. Ingresses and Direct/Retrogrades can be overlayed to each heat map - transit chart for selected locations in both round and diamond format. The diamond format used by Sidereal Astrologers has a 9th harmonic chart and a listing of planetary strengths, aspects, combustion with the Sun - sort strip for a 15 degree equivalent longitude degree - solar lunar calendar - lunar cycle - planetary cycles - select a planetary pair to show their planetary cycle by way of a pie-chart. Also includes a summary listing of various planets and their current phase in their respective cycle - add notes - aspect / retrograde / ingress / planet to degree search for a 1 year period - Watch List capability so users can add / delete selected aspects / retrogrades / ingresses / degree from the Search menu option. Items can also be added to the Watch List from Moon, Ingresses, Retro , Outers tabs and Eclipses - date picker so user can select other time periods for all calculations - high precision calculations based on the latest Swiss Ephemeris The app is easy to use with clear, concise tables setting out the information

About

Synastry

This app analyzes your astrological birth chart and current planetary aspects to provide personalized, real-time cosmic insights. It notifies you of transits affecting your chart and explains their potential impact and duration. Designed for those already familiar with astrology, it offers a unique connection to the cosmos.

Highlights
  • Personalized birth chart analysis
  • Real-time planetary aspect tracking
  • Transit notifications
  • Explanation of transit meanings
  • Aspect duration details
  • Intuitive user interface
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

Planetary Guide4 screens
Synastry4 screens

Verdict

The call

The clearest difference is price: Synastry at Free against Planetary Guide's $9.99. Planetary Guide's advantage is ads (none vs shown). On update cadence, in-app purchases, 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

Synastry is free to download; Planetary Guide costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Planetary Guide ships an update weekly, Synastry every 6 days. The most recent releases landed on November 4, 2026 and November 8, 2026 respectively.

Scorecard2 real differences · 7 level
Planetary Guide versus Synastry: the parameters behind the verdict, then further details
ParameterPlanetary GuideSynastry
Price$9.99Free — better
Rating—2.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyWeeklyEvery 6 days — better
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.0 — better18.6
Further details — not scored
Size7 MB15 MB
Age rating4+4+
DeveloperAllyson Jane BuntingTryfon Stergiou

In-app purchases

None

Planetary Guide

No in-app purchases

None

Synastry

No in-app purchases

Questions

Is Planetary Guide free?
Planetary Guide costs $9.99, with no in-app purchases.
Is Synastry free?
Synastry is free to download, with no in-app purchases.
Do Planetary Guide or Synastry have ads?
Synastry shows ads; Planetary Guide does not.
Which is updated more often, Planetary Guide or Synastry?
Planetary Guide ships an update weekly, and Synastry every 6 days. Most recently, Planetary Guide was updated on November 4, 2026 and Synastry on November 8, 2026.

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