Comparison

RelativityTheory vs SpaceFold

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

Head to head
About

RelativityTheory

Features
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Introducing and explaining the mysterious phenomenon derived from the theory of relativity. In particular, we will detail the changes in the way time progresses. The interstellar flight screen shows how time progresses in response to rocket speed. Shows the difference in how time progresses between rockets and the earth in space travel. The GPS screen shows that gravity changes the way time progresses.

About

SpaceFold

Features
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SpaceFold is an interactive AR learning experience that transforms the Theory of Relativity into something you can see, explore, and understand. Instead of relying on complex equations, SpaceFold uses Augmented Reality, interactive simulations, and intelligent explanations to help users build an intuitive understanding of space, time, and motion. FEATURES โ€ข Spacetime Fabric Place a spacetime grid in your environment and watch it bend under the influence of mass. Explore gravity as the curvature of spacetime and discover how objects naturally move through curved geometry. โ€ข Time Walk Become a moving observer and experience the effects of time dilation. Compare clocks, explore motion near light speed, and understand how time changes depending on your journey. โ€ข Observer Perspective Switch between different reference frames and see how events can appear differently to different observers. Learn why simultaneity is relative and why there is no universal clock. โ€ข Intelligent Explanations Powered by Apple Foundation Models, SpaceFold provides contextual explanations based on your interactions, helping transform observations into understanding. WHY SpaceFold? Physics is often taught through equations and diagrams. SpaceFold takes a different approach by allowing users to interact directly with the concepts behind relativity through immersive AR experiences. Whether you're a student or simply curious about the universe, SpaceFold offers a visual and intuitive way to explore one of the most fascinating ideas in modern physics. Experience physics. See space. Fold time.

Screenshots

RelativityTheory2 screens
SpaceFold4 screens

Verdict

The call

The clearest difference is price: SpaceFold at Free against RelativityTheory's $0.99. SpaceFold also leads on update cadence (weekly vs every 3 weeks). RelativityTheory's advantage is iOS requirement (14.4 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

SpaceFold is free to download; RelativityTheory costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RelativityTheory ships an update every 3 weeks, SpaceFold weekly. Both last shipped on October 1, 2026.

Scorecard3 real differences ยท 3 level
RelativityTheory versus SpaceFold: the parameters behind the verdict, then further details
ParameterRelativityTheorySpaceFold
Price$0.99Free โ€” better
Update frequencyEvery 3 weeksWeekly โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS14.4 โ€” better26.0
Further details โ€” not scored
Size6 MB6 MB
Age rating4+4+
DeveloperTakao AkatsuGALGOTIAS UNIVERSITY,SCHOOL OF BUSINESS

In-app purchases

None

RelativityTheory

No in-app purchases

None

SpaceFold

No in-app purchases

Questions

Is RelativityTheory free?
RelativityTheory costs $0.99, with no in-app purchases.
Is SpaceFold free?
SpaceFold is free to download, with no in-app purchases.
Do RelativityTheory or SpaceFold have ads?
Neither RelativityTheory nor SpaceFold shows ads.
Which is updated more often, RelativityTheory or SpaceFold?
RelativityTheory ships an update every 3 weeks, and SpaceFold weekly. Most recently, RelativityTheory was updated on October 1, 2026 and SpaceFold on October 1, 2026.

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