Comparison

Primality vs AppAtlas Explorer

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

Head to head
About

Primality

This app determines if a given integer is prime or provides its prime factors. It also calculates the ordinal position of prime numbers found, up to a certain limit.

Highlights
  • Primality testing
  • Prime factorization
  • Prime ordinality calculation
  • Large integer support (up to 999,999,999,999)
  • Clean and simple interface
Features
Read full description

The Primality App has a clean and simple, yet powerful, function: Given any integer, the app determines either that the given integer is prime or else it provides all prime factors of that integer. Very clean, very simple, focussed. The app operates in the range of 0 - 999,999,999,999. A popular feature of the app is its ability to determine the prime ordinality of each prime found, such as observing that 97 if the 25th prime. (However, this particular feature is available only up to the 100,000th prime, which is 1,299,709.) Requires iOS 13 or higher.

About

AppAtlas Explorer

Features
Read full description

See the world’s popular apps at a glance. AppAtlas Explorer is an app that lets you browse App Store information by country and region, and view app trends around the world on a globe or in lists. By exploring popular apps and official rankings, you can enjoy discovering differences in app culture across regions and finding new apps. ■ Recommended for • People who want to know which apps are popular around the world • People interested in App Store trends in other countries • People who want to explore differences in app culture by region • People looking for new apps to discover ■ What you can do • View App Store rankings from around the world on a globe • Browse popular apps by country and region in list form • Switch between Top Free and Top Paid to compare them • See which apps are popular across multiple countries and regions • Search for apps by country or region • Enjoy exploring differences in app culture and trends around the world ■ Page features Globe You can visually explore popular apps from countries around the world on a globe. By looking at their distribution, you can intuitively understand regional differences. Store You can browse App Store rankings for a selected country or region in a list. This makes it easy to quickly check which apps are currently popular there. Coverage You can view apps that appear across multiple countries and regions in an aggregated list. This helps you find apps that are popular across a wide area or supported across regions. Search You can search for apps by country or region. This allows you to see how a particular app appears in different regions. ■ Privacy Policy and Terms of Use AppAtlas Explorer provides a Privacy Policy and Terms of Use. Please refer to the following pages for details. Privacy Policy https://www.atlascope.idatabase.info/app/en/privacy.html Terms of Use https://www.atlascope.idatabase.info/app/en/terms.html

Screenshots

Primality2 screens
AppAtlas Explorer4 screens

Verdict

The call

The clearest difference is in-app purchases: Primality at none against AppAtlas Explorer's 3. Primality also leads on ads (none vs shown) and iOS requirement (13.2 vs 18.6). AppAtlas Explorer's advantage is update cadence (every 4 days vs every 2 months). On price and device support 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

Both are free to download. AppAtlas Explorer sells 3 in-app purchases, starting at $0.99 per month. Primality asks for nothing beyond the download.

UpkeepUpdate frequency

Primality ships an update every 2 months, AppAtlas Explorer every 4 days. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

Scorecard4 real differences · 6 level
Primality versus AppAtlas Explorer: the parameters behind the verdict, then further details
ParameterPrimalityAppAtlas Explorer
PriceFreeFree
Rating4.9 (24 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings24 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.2 — better18.6
Further details — not scored
Size1 MB13 MB
Age rating4+4+
DeveloperBruce SchechterYUTAKA MIMURA

In-app purchases

None

Primality

No in-app purchases

3 purchases

AppAtlas Explorer

Subscriptions1
  • AppAtlas ExplorerPro (Monthly)$0.991 Month
One-time2
  • Support Development (Small)$0.99
  • Support Development (Large)$9.99

Questions

Is Primality free?
Primality is free to download, with no in-app purchases.
Is AppAtlas Explorer free?
AppAtlas Explorer is free to download, with in-app purchases available.
Do Primality or AppAtlas Explorer have ads?
AppAtlas Explorer shows ads; Primality does not.
Which is updated more often, Primality or AppAtlas Explorer?
Primality ships an update every 2 months, and AppAtlas Explorer every 4 days. Most recently, Primality was updated on October 13, 2026 and AppAtlas Explorer on October 1, 2026.

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