Primality vs AppAtlas Explorer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Primality testing
- Prime factorization
- Prime ordinality calculation
- Large integer support (up to 999,999,999,999)
- Clean and simple interface
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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.
AppAtlas Explorer
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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
Verdict
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
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.
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.
| Parameter | Primality | AppAtlas Explorer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (24 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 24 — better | — |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.2 — better | 18.6 |
| Further details — not scored | ||
| Size | 1 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Bruce Schechter | YUTAKA MIMURA |
In-app purchases
Primality
No in-app purchases
AppAtlas Explorer
- AppAtlas ExplorerPro (Monthly)$0.991 Month
- Support Development (Small)$0.99
- Support Development (Large)$9.99
Questions
Is Primality free?
Is AppAtlas Explorer free?
Do Primality or AppAtlas Explorer have ads?
Which is updated more often, Primality or AppAtlas Explorer?
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