Cool Astronomy Facts vs Alien Planets
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Offline access
- 17 astronomy categories
- 400+ astronomy facts
- Searchable facts
- Favorite facts
- Share facts
- Adjustable font size
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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
Alien Planets
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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
Verdict
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
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.
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.
| Parameter | Cool Astronomy Facts | Alien Planets |
|---|---|---|
| Price | $1.99 — better | $9.99 |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 37 months | Every 24 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #192 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 27.0 |
| Further details — not scored | ||
| Size | 24 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Coskun CAKIR | Jose Leal |
In-app purchases
Cool Astronomy Facts
No in-app purchases
Alien Planets
No in-app purchases
Questions
Is Cool Astronomy Facts free?
Is Alien Planets free?
Do Cool Astronomy Facts or Alien Planets have ads?
Which is updated more often, Cool Astronomy Facts or Alien Planets?
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