Comparison

Back in Time vs StroopEffect2

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

StroopEffect2

This app demonstrates the psychological phenomenon known as the Stroop effect. It presents a time-trial game where users must identify the color of words, even when the word itself names a different color. It's a fun way to explore cognitive processing and reaction times.

Highlights
  • Stroop effect demonstration
  • Time trial game mode
  • Cognitive processing experiment
  • Reaction time measurement
  • Educational psychology tool
Features
Read full description

Stroop Effect Experiment app. Time Trial Game. Stroop Effect(from WIKIPEDIA in 2011.01.21) In psychology, the Stroop effect is a demonstration of the reaction time of a task. When the name of a color (e.g., "blue," "green," or "red") is printed in a color not denoted by the name (e.g., the word "red" printed in blue ink instead of red ink), naming the color of the word takes longer and is more prone to errors than when the color of the ink matches the name of the color.

Screenshots

StroopEffect24 screens

Verdict

The call

The clearest difference is review sentiment: StroopEffect2 at 100% against Back in Time's 76%. StroopEffect2 also leads on price ($2.99 vs $7.99) and device support (3 vs 1). Back in Time's advantage is update cadence (every 7 months vs every 14 months). On ads, in-app purchases, monetization model and iOS requirement 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 StroopEffect2 $2.99 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, StroopEffect2 every 14 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard4 real differences · 6 level
Back in Time versus StroopEffect2: the parameters behind the verdict, then further details
ParameterBack in TimeStroopEffect2
Price$7.99$2.99 — better
Rating4.7 (27 ratings) — better—
Positive reviews75.9% of reviews100.0% of reviews — better
Number of ratings27 — better—
Update frequencyEvery 7 months — betterEvery 14 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS16.015.6 — better
Further details — not scored
Size836 MB2 MB
Age rating4+4+
DeveloperLandkaYasuyoshi Ota

Customer experience

Back in Time

All ratings25 ratings
Positive92.0%
Neutral4.0%
Negative4.0%
Written reviews108 reviews
Positive75.9%
Neutral12.0%
Negative12.0%

StroopEffect2

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Back in Time

No in-app purchases

None

StroopEffect2

No in-app purchases

Questions

Is Back in Time free?
Back in Time costs $7.99, with no in-app purchases.
Is StroopEffect2 free?
StroopEffect2 costs $2.99, with no in-app purchases.
Do Back in Time or StroopEffect2 have ads?
Neither Back in Time nor StroopEffect2 shows ads.
Which is updated more often, Back in Time or StroopEffect2?
Back in Time ships an update every 7 months, and StroopEffect2 every 14 months. Most recently, Back in Time was updated on November 6, 2026 and StroopEffect2 on November 2, 2026.

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