Comparison

RelativityTheory vs Periodic

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

Periodic

Features
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The PeriodicTableElements is an elegant app that is interactive and fun. Easy to use, easy to understand, simple and effective. It shows the periodic table of elements in variety of ways 1) Classic grid with name that is color coded. You can configure it to look however you like. 2) Visually appealing electron distribution. 3) Visually appealing Lewis dot structure. 4) List that can be sorted based on different element properties like group, period, category etc. These awesome periodic tables can be shared by simple double click anywhere on the table. It is possible to copy the periodic table diagrams as high quality SVG xml. Drag your finger on the periodic table canvas to update elements automatically or tap on an element to see more details. Tap on an element and all the rest of the related elements are highlighted. Details of a selected element is shown in a beautifully drawn animated element. Tap on the animated element and you will see more details that can also be shared. Tapping on the list element will navigate you to a page that shows details of the element. It automatically saves your hard work locally on your device so you can come back and pick up from where you left off as your great effort will not be lost. This is a perfect app if you are a student learning chemistry. This is an app for all student groups. From high school to college to university students. Be creative. Enjoy the app!

Screenshots

RelativityTheory2 screens
Periodic4 screens

Verdict

The call

The clearest difference is update cadence: RelativityTheory at every 3 weeks against Periodic's every 5 weeks. RelativityTheory also leads on price ($0.99 vs $1.99). On ads, in-app purchases, device support and iOS requirement 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

RelativityTheory costs $0.99 and Periodic $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RelativityTheory ships an update every 3 weeks, Periodic every 5 weeks. The most recent releases landed on September 13, 2026 and August 16, 2026 respectively.

Scorecard2 real differences ยท 4 level
RelativityTheory versus Periodic: the parameters behind the verdict, then further details
ParameterRelativityTheoryPeriodic
Price$0.99 โ€” better$1.99
Update frequencyEvery 3 weeks โ€” betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.4 โ€” better15.1
Further details โ€” not scored
Size6 MB31 MB
Age rating4+4+
DeveloperTakao AkatsuOm Prakash Chapagain

In-app purchases

None

RelativityTheory

No in-app purchases

None

Periodic

No in-app purchases

Questions

Is RelativityTheory free?
RelativityTheory costs $0.99, with no in-app purchases.
Is Periodic free?
Periodic costs $1.99, with no in-app purchases.
Do RelativityTheory or Periodic have ads?
Neither RelativityTheory nor Periodic shows ads.
Which is updated more often, RelativityTheory or Periodic?
RelativityTheory ships an update every 3 weeks, and Periodic every 5 weeks. Most recently, RelativityTheory was updated on September 13, 2026 and Periodic on August 16, 2026.

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