Comparison

Planet vs Solar System&Celestial Objects

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

Head to head

Solar System&Celestial Objects

Solar System Stars Flashcard

Free

📚 Education

No ratingsView app →

About

Planet

Features

Read full description

This App gives details about temperatures in our solar system. Beside the theoretical temperature the app will show actual facts about each planet like the albedo, temperature, average distance to sun and details about the atmosphere. It is specially programmed to help understanding the climates in our solar system and is helpfull for students, schools and teaching.

About

Solar System&Celestial Objects

Features

Read full description

Easy learning about solar system, stars, celestial objects, constellations, spacecraft with pictures ,sounds and quiz games. If you who always search and learn a quiz app like these, this app is for you ① Solar system Flash card app. ② Stars Quiz app. ③ Celestial objects quiz app. ④ Stars history and information app. ⑤ Constellations name cards. ⑥ Guess solar system app. Features: - You can learn many kinds of stars. - You can play solar system quiz. - Many information related to solar system, stars, celestial objects, constellations, spacecraft - Support Quiz feature. - Support 5 languages: English, Japanese, Korean, Chinese, Vietnamese

Screenshots

Planet3 screens

Solar System&Celestial Objects4 screens

Verdict

The call

The clearest difference is ads: Planet at none against Solar System&Celestial Objects's shown. Planet also leads on update cadence (every 3 weeks vs every 6 weeks). Solar System&Celestial Objects's advantage is iOS requirement (12.0 vs 15.4). On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Planet ships an update every 3 weeks, Solar System&Celestial Objects every 6 weeks. The most recent releases landed on October 25, 2026 and October 18, 2026 respectively.

Scorecard3 real differences · 3 level

Planet versus Solar System&Celestial Objects: the parameters behind the verdict, then further details
Parameter	Planet	Solar System&Celestial Objects
Price	Free	Free
Update frequency	Every 3 weeks — better	Every 6 weeks
Ads	No — better	Yes
In-app purchases	No	No
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	15.4	12.0 — better
Further details — not scored
Size	16 MB	62 MB
Age rating	4+	4+
Developer	David Borgelt	NIKI TECH

In-app purchases

None

Planet

No in-app purchases

None

Solar System&Celestial Objects

No in-app purchases

Questions

Is Planet free?

Planet is free to download, with no in-app purchases.

Is Solar System&Celestial Objects free?

Solar System&Celestial Objects is free to download, with no in-app purchases.

Do Planet or Solar System&Celestial Objects have ads?

Solar System&Celestial Objects shows ads; Planet does not.

Which is updated more often, Planet or Solar System&Celestial Objects?

Planet ships an update every 3 weeks, and Solar System&Celestial Objects every 6 weeks. Most recently, Planet was updated on October 25, 2026 and Solar System&Celestial Objects on October 18, 2026.