Comparison

Cool Astronomy Facts vs Alien Planets

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

Head to head
About

Cool Astronomy Facts

Discover mind-blowing astronomy and space facts across 17 categories. Improve your knowledge with offline access to around 400 facts, easily searchable and shareable. Customize your reading experience with adjustable font sizes and view options.

Highlights
  • Offline access
  • 17 astronomy categories
  • 400+ astronomy facts
  • Searchable facts
  • Favorite facts
  • Share facts
  • Adjustable font size
Features
Currently charting
Read full description

Our app has collection of interesting,amazing and fascinating astronomy and space facts that will blow your mind. You can improve your knowledge and information about astronomy and space with this app. FEATURES - Internet connection is NOT needed. - There are 17 astronomy categories. - There are about 400 astronomy facts. - Search any fact easily. - Save facts as your favorites. - Share facts with your friends over SMS and E-Mail. - You can view facts as catalog or as list. - You can navigate facts sliding right or left by hand. - You can change font size to read facts easily. CATEGORIES - Sun - Mercury - Venus - Mars - Jupiter - Saturn - Uranus - Neptune - Pluto - Moon - Asteroids - Meteoroids - Stars - Galaxies - Comets - Satellites - Space Stations

About

Alien Planets

Features
Read full description

Alien Planets is a field guide to worlds that do not orbit our Sun. Somewhere out there, a year can last a few days, a sky can hold two suns, and a planet can be so close to its star that its surface is a permanent storm. This app turns those distant discoveries into something you can actually browse. Open it and move through confirmed exoplanets and the stars they circle. Each world comes with the details that make it real: how large it is, how massive, how long it takes to orbit, how far away it sits, and how it was found. Set a planet next to Earth or Jupiter and the scale snaps into place. A “super-Earth” stops being a label and starts looking like a place. The catalog keeps growing. New observations revise old numbers, and planets once listed as candidates become confirmed. Alien Planets stays with that living record, written in plain language, so you can follow the nearest known worlds, the strangest orbits, and the thin band astronomers call the habitable zone without getting lost in a research paper. Save the planets you want to come back to. Then keep going. The galaxy is full of new worlds, and most of them still have a story waiting.

Screenshots

Cool Astronomy Facts4 screens
Alien Planets4 screens

Verdict

The call

The clearest difference is price: Cool Astronomy Facts at $1.99 against Alien Planets's $9.99. Cool Astronomy Facts also leads on chart position (#192 vs unranked) and iOS requirement (11.0 vs 27.0). On update cadence, ads, in-app purchases and device support 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

Cool Astronomy Facts costs $1.99 and Alien Planets $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Cool Astronomy Facts ships an update every 37 months, Alien Planets every 24 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
Cool Astronomy Facts versus Alien Planets: the parameters behind the verdict, then further details
ParameterCool Astronomy FactsAlien Planets
Price$1.99 — better$9.99
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 37 monthsEvery 24 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#192 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better27.0
Further details — not scored
Size24 MB51 MB
Age rating4+4+
DeveloperCoskun CAKIRJose Leal

In-app purchases

None

Cool Astronomy Facts

No in-app purchases

None

Alien Planets

No in-app purchases

Questions

Is Cool Astronomy Facts free?
Cool Astronomy Facts costs $1.99, with no in-app purchases.
Is Alien Planets free?
Alien Planets costs $9.99, with no in-app purchases.
Do Cool Astronomy Facts or Alien Planets have ads?
Neither Cool Astronomy Facts nor Alien Planets shows ads.
Which is updated more often, Cool Astronomy Facts or Alien Planets?
Cool Astronomy Facts ships an update every 37 months, and Alien Planets every 24 months. Most recently, Cool Astronomy Facts was updated on November 6, 2026 and Alien Planets on November 3, 2026.

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