Comparison

Back in Time vs Universe Size Comparison

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

Universe Size Comparison

Explore the vastness of space and understand celestial body dimensions through interactive 3D comparisons. Discover the scale of planets and stars, from our Sun to hypergiant stars, with guided tours and free comparison modes.

Highlights
  • 3D astronomical comparisons
  • Tour Mode with guided explanations
  • Free Mode for custom comparisons
  • Scale comparisons of planets and stars
  • Detailed celestial body information
  • Elegant user interface
Features
Read full description

Universe Size Comparison is a unique 3D astronomical app that will make you understand the real dimensions of the universe and how small we are. Have you ever wondered how big the Sun is compared to Earth? Or what is the largest planet between Mars and Earth? Do you want to find out the dimensions of some of the most famous stars in the sky like Rigel and Betelgeuse in comparison to our Sun? Do you want to compare everything with the hypergiant star VY Canis Majoris? Universe Size Comparison is the right app for you. The app offers two modes: Tour Mode and Free Mode. Tour mode will guide you on a spectacular journey where you will see planets and stars compared in full scale. All accompanied by simple and clear explanations regardless of the level of knowledge of the subject. The Free mode will allow you to compare two celestial bodies of your choice in scale. You will also find out more information on the bodies you are comparing thanks to an elegant user interface designed to offer the maximum user experience.

Screenshots

Universe Size Comparison4 screens

Verdict

The call

The clearest difference is rating: Back in Time at 4.7 against Universe Size Comparison's 3.2. Back in Time also leads on review sentiment (84% vs 70%). Universe Size Comparison's advantage is price ($1.99 vs $7.99) and update cadence (every 3 months vs every 7 months). On ratings volume, ads, in-app purchases and monetization model 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

Back in Time costs $7.99 and Universe Size Comparison $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Back in Time holds the better App Store score, 4.7 against 3.2. Both are backed by a comparable volume of ratings — 27 and 30 respectively. Written reviews point the same way: 84% of Back in Time's written reviews are positive against 70% of Universe Size Comparison's.

UpkeepUpdate frequency

Back in Time ships an update every 7 months, Universe Size Comparison every 3 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard5 real differences · 5 level
Back in Time versus Universe Size Comparison: the parameters behind the verdict, then further details
ParameterBack in TimeUniverse Size Comparison
Price$7.99$1.99 — better
Rating4.7 (27 ratings) — better3.2 (30 ratings)
Positive reviews83.7% of reviews — better70.0% of reviews
Number of ratings2730 — better
Update frequencyEvery 7 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, Apple TV — better
Requires iOS16.0 — better17.0
Further details — not scored
Size836 MB411 MB
Age rating4++4
DeveloperLandkaDaniele Citi

Customer experience

Back in Time

All ratings25 ratings
Positive92.0%
Neutral4.0%
Negative4.0%
Written reviews43 reviews
Positive83.7%
Neutral7.0%
Negative9.3%

Universe Size Comparison

All ratings30 ratings
Positive46.7%
Neutral20.0%
Negative33.3%
Written reviews10 reviews
Positive70.0%
Neutral30.0%
Negative0.0%

In-app purchases

None

Back in Time

No in-app purchases

None

Universe Size Comparison

No in-app purchases

Questions

Is Back in Time free?
Back in Time costs $7.99, with no in-app purchases.
Is Universe Size Comparison free?
Universe Size Comparison costs $1.99, with no in-app purchases.
Which has better reviews, Back in Time or Universe Size Comparison?
Back in Time is rated higher. Back in Time averages 4.7 out of 5 from 27 ratings, while Universe Size Comparison averages 3.2 from 30 ratings.
Do Back in Time or Universe Size Comparison have ads?
Neither Back in Time nor Universe Size Comparison shows ads.
Which is updated more often, Back in Time or Universe Size Comparison?
Back in Time ships an update every 7 months, and Universe Size Comparison every 3 months. Most recently, Back in Time was updated on October 24, 2026 and Universe Size Comparison on October 26, 2026.

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