Prime Checker vs 3n or Not
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
Read full descriptionHide full description
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
3n or Not
Test your quick thinking with this educational game. It challenges you to rapidly identify if a given number is divisible by three. Perfect for practicing mental math skills.
- Quick number discrimination
- Multiple of 3 identification
- Mental math practice
- Educational game
Read full descriptionHide full description
3n or Not is a game to quickly discrimination whether that number is a multiple of 3 or not.
Screenshots
Verdict
The clearest difference is ads: Prime Checker at none against 3n or Not's shown. Prime Checker also leads on monetization model (free vs ad-supported) and iOS requirement (12.4 vs 14.0). 3n or Not's advantage is update cadence (every 4 months vs every 17 months). On price, rating, review sentiment and ratings volume 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. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Prime Checker against 5.0 for 3n or Not. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews split almost evenly too, at 96% and 95% positive.
Prime Checker ships an update every 17 months, 3n or Not every 4 months. The most recent releases landed on September 29, 2026 and October 24, 2026 respectively.
| Parameter | Prime Checker | 3n or Not |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (3 ratings) |
| Positive reviews | 95.8% of reviews — better | 95.5% of reviews |
| Number of ratings | 3 | 3 |
| Update frequency | Every 17 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 12.4 — better | 14.0 |
| Further details — not scored | ||
| Size | 3 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Heart Solutions, Inc. | Ninicode |
Customer experience
Prime Checker
3n or Not
In-app purchases
Prime Checker
No in-app purchases
3n or Not
No in-app purchases
