Comparison

Back in Time 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
About

Back in Time

Explore the history of the Universe, Earth, Life, and Civilization through an immersive, interactive journey. This app uses custom animations, timelines, and interesting facts to bring historical events to life. It's designed to help users understand the connections between events and see the bigger picture.

Highlights
  • Interactive timeline of events
  • Custom animations and videos
  • Over 350 remarkable images
  • Little-known interesting facts
  • Offline access
  • Multilingual support
Features
Read full description

• "The coolest history textbook you’ll find on the iPad" - The New York Times • Winner of the WSA Mobile Award • Top1 iPad Book in US, UK, FR, ES, China… and 34 more Countries • Featured by The New York Times (Top10 iPad Apps of the year) • Featured by the American Photo Magazine (Top 10 Photo eBooks of the year) For iPhone/iPod touch download - Back in Time for iPhone Back in Time will take you on a stunning exploration of the history of our Universe, Earth, Life and Civilization. A journey through time where each event is documented with social and historical context, several images, an illustrative timeline and little-known interesting facts. Custom made animations bring those events to life, creating an interesting, immersive learning experience. An imaginary clock will guide you through this quest, proposing a simple analogy: the entire Universe started 24 hours ago. The Big Bang, the source of time and space, is the first event in our journey – the clock reads 0:00 hours. Today, 13.7 billion years later, the clock reads midnight. In between is a sequence of key events that has brought us to where we are today. Explore them, place them in perspective, see how they relate and understand the connections. We invite you to take a step back and see the whole picture. :::: REVIEWS :::: “...a beautifully executed lesson on the history of the universe and the evolution of life on earth. Great for high school students or parents who’d like to tutor younger children and enjoy a first-rate experience of their own...” - Bob Tedeschi, The New York Times “The iPad could use more apps like this one.” - The Daily “...the best iPad apps are those that combine coffee table-styled books with the fluid nature of the iPad’s interface. Back in Time is just that, it’s the story of the entire history of our universe made interactive on the iPad.” - Casey Chan, Gizmodo (App of the Day) “Back in Time is utterly gorgeous in its presentation. (...) The app is so easy to navigate that it is a delight to explore. Landka could scarcely have done a better job in putting everything together.” - Gwen Phua, Appmodo :::: FEATURES :::: Designed for iPad; 47 chapters; Over 350 remarkable images; 60+ amazing animations and videos; 40+ illustrated timelines; More than 200 little-known interesting facts; Music by the composer Rodrigo Leão; Developed in 7 different languages (English, Spanish, German, French, Portuguese, Japanese and Chinese); No internet connection required.

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

Solar System&Celestial Objects4 screens

Verdict

The call

The clearest difference is price: Solar System&Celestial Objects at Free against Back in Time's $7.99. Solar System&Celestial Objects also leads on update cadence (every 6 weeks vs every 7 months) and device support (3 vs 1). Back in Time's advantage is ads (none vs shown). On in-app purchases 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

Solar System&Celestial Objects is free to download; Back in Time costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Back in Time ships an update every 7 months, Solar System&Celestial Objects every 6 weeks. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

Scorecard5 real differences · 5 level
Back in Time versus Solar System&Celestial Objects: the parameters behind the verdict, then further details
ParameterBack in TimeSolar System&Celestial Objects
Price$7.99Free — better
Rating4.6 (25 ratings) — better—
Positive reviews83.7% of reviews—
Number of ratings25 — better—
Update frequencyEvery 7 monthsEvery 6 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaid—
DevicesiPadiPhone, iPad, iPod — better
Requires iOS16.012.0 — better
Further details — not scored
Size836 MB62 MB
Age rating4+4+
DeveloperLandkaNIKI TECH

In-app purchases

None

Back in Time

No in-app purchases

None

Solar System&Celestial Objects

No in-app purchases

Questions

Is Back in Time free?
Back in Time costs $7.99, 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 Back in Time or Solar System&Celestial Objects have ads?
Solar System&Celestial Objects shows ads; Back in Time does not.
Which is updated more often, Back in Time or Solar System&Celestial Objects?
Back in Time ships an update every 7 months, and Solar System&Celestial Objects every 6 weeks. Most recently, Back in Time was updated on October 7, 2026 and Solar System&Celestial Objects on October 2, 2026.

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