Prime Checker vs Prime Factors
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prime Checker
This app performs advanced mathematical calculations for numbers, including integer factorization, Euler's totient function, and solving specific Diophantine equations. It utilizes advanced algorithms for factorization and primality testing.
- Integer factorization
- Euler's totient function
- Primitive root calculation
- Diophantine equation solver
- Primality testing
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This application calculate values of given number which are described below: * Integer factorization * Euler's totient function * Primitive root (if exist) * x, y where x^2 + y^2 = p if p is 4n+1 * x, y where x^2 + 3y^2 = p if p is 3n+1 * x, y where x^2 + 2y^2 = p if p is 8n+1 or 8n+3 * x, y where x^2 - 2y^2 = p if p is 8n+1 or 8n+7 This application uses Fermat algorithm, Pollard's rho algorithm and Lenstra's ECM for factorization, Miller–Rabin algorithm for primality test
Prime Factors
Explore numbers up to one trillion, with primes clearly marked. Tap any number to reveal its prime factors. Easily navigate to specific numbers using the search function and adjust the display with pinch-to-zoom gestures.
- View numbers up to 1 trillion
- Prime numbers highlighted
- Tap for prime factors
- Search for specific numbers
- Pinch and zoom display
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View all numbers from 1 to 1,000,000,000,000. Prime numbers shown with a red circle. Tap a number to see its Prime Factors. Jump directly to a number with the search field. • Prime Numbers are marked with a red circle • Prime Factors can be viewed by tapping on a number • Pinch and Zoom to change the number of columns
Screenshots
Verdict
The clearest difference is price: Prime Checker at Free against Prime Factors's $0.99. Prime Checker also leads on rating (5.0 vs 3.9) and review sentiment (96% vs 79%). Prime Factors's advantage is ratings volume (24 vs 3). On update cadence, ads, in-app purchases and monetization model 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
Prime Checker is free to download; Prime Factors costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Prime Checker holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Prime Factors has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 96% of Prime Checker's written reviews are positive against 79% of Prime Factors's.
Prime Checker ships an update every 17 months, Prime Factors every 21 months. The most recent releases landed on September 29, 2026 and October 24, 2026 respectively.
| Parameter | Prime Checker | Prime Factors |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (3 ratings) — better | 3.9 (24 ratings) |
| Positive reviews | 95.8% of reviews — better | 78.6% of reviews |
| Number of ratings | 3 | 24 — better |
| Update frequency | Every 17 months — better | Every 21 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 12.4 — better | 18.0 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Heart Solutions, Inc. | Paul Hangas |
Customer experience
Prime Checker
Prime Factors
In-app purchases
Prime Checker
No in-app purchases
Prime Factors
No in-app purchases
Questions
Is Prime Checker free?
Is Prime Factors free?
Which has better reviews, Prime Checker or Prime Factors?
Do Prime Checker or Prime Factors have ads?
Which is updated more often, Prime Checker or Prime Factors?
Other comparisons
