Comparison

Solar Book vs Intergalactic Solar System

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

Head to head
About

Solar Book

This app provides detailed information about solar eclipses, including timings for different phases based on your location. It allows you to view sequential images and star charts for planning and observation.

Highlights
  • Solar eclipse phase timing
  • Location-based eclipse calculations
  • Sequential eclipse image display
  • Star chart visualization
  • Past and future eclipse planning
Read full description

The Solar Book is an app for smart-phones and tablets for a solar eclipse. The Solar Book shows at what time each portion of the Sun is covered by the Moon during a solar eclipse. The beginning time of a solar eclipse, time of the maximum phase of the solar eclipse and the ending time of the solar eclipse will change depending on the location of your observing area. The Solar Book will show you the eclipse phases at your location. Your location for observing the solar eclipse can be designated with use of the location setup dialog box. This allows you to plan in advance the progression of the eclipse. Sequential images of the solar eclipse will be displayed in the appropriate order when you tap on the eclipse thumbnail images icon on the lower right of the screen. Solar eclipses can be displayed by designating the date of a solar eclipse in the past or the future if you cannot find it in a list of the selection. The Solar Book will show you a star chart of the sky at your place of observation if the solar eclipse is not selected.

About

Intergalactic Solar System

Explore planets, moons, and countries in this space simulator mini-game. Learn astronomy and geography aligned with next-generation science standards. Discover the Milky Way galaxy and assess your knowledge through engaging gameplay.

Highlights
  • Planet and moon exploration
  • Country geography learning
  • Milky Way galaxy view
  • Common Core aligned curriculum
  • Proficiency assessment
  • Engaging gameplay levels
Features
Read full description

Intergalactic Education introduces Intergalactic Solar System, a mini-game that teaches about planets, moons, and countries. This space simulator lets you explore celestial bodies from the viewpoint of space itself. The latest edition adds the Milky Way as an observable galaxy. Intergalactic Solar System uses next generation science standards (Common Core aligned) astronomy and geography. (Follows standards ESS1.A, ESS1.B, and CCSS.ELA-LITERACY.RH.6-8.7) Try Intergalactic Solar System! Assess proficiency in Solar System knowledge according to educational standards. Rewarding levels of gameplay maintain engagement. You will forget you were doing astronomy and geography!

Screenshots

Solar Book3 screens
Intergalactic Solar System3 screens

Verdict

The call

The clearest difference is rating: Solar Book at 4.7 against Intergalactic Solar System's 4.0. Solar Book also leads on in-app purchases (none vs 1). Intergalactic Solar System's advantage is update cadence (monthly vs every 14 months) and ratings volume (25 vs 3). On price, ads, 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. Intergalactic Solar System sells 1 one-off in-app purchase. Solar Book asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Solar Book holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Intergalactic Solar System has 25 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Solar Book ships an update every 14 months, Intergalactic Solar System monthly. The most recent releases landed on October 19, 2026 and October 9, 2026 respectively.

Scorecard5 real differences · 5 level
Solar Book versus Intergalactic Solar System: the parameters behind the verdict, then further details
ParameterSolar BookIntergalactic Solar System
PriceFreeFree
Rating4.7 (3 ratings) — better4.0 (25 ratings)
Positive reviews—70.0% of reviews
Number of ratings325 — better
Update frequencyEvery 14 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size5 MB355 MB
Age rating4+4+
DeveloperVixen Co.,Ltd.Intergalactic Education LLC

Customer experience

Solar Book

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Intergalactic Solar System

All ratings20 ratings
Positive75.0%
Neutral5.0%
Negative20.0%
Written reviews10 reviews
Positive70.0%
Neutral10.0%
Negative20.0%

In-app purchases

None

Solar Book

No in-app purchases

1 purchases

Intergalactic Solar System

One-time1
  • Access to Full Game$3.99

Questions

Is Solar Book free?
Solar Book is free to download, with no in-app purchases.
Is Intergalactic Solar System free?
Intergalactic Solar System is free to download, with in-app purchases available.
Which has better reviews, Solar Book or Intergalactic Solar System?
Solar Book is rated higher. Solar Book averages 4.7 out of 5 from 3 ratings, while Intergalactic Solar System averages 4.0 from 25 ratings.
Do Solar Book or Intergalactic Solar System have ads?
Neither Solar Book nor Intergalactic Solar System shows ads.
Which is updated more often, Solar Book or Intergalactic Solar System?
Solar Book ships an update every 14 months, and Intergalactic Solar System monthly. Most recently, Solar Book was updated on October 19, 2026 and Intergalactic Solar System on October 9, 2026.

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