Prime Checker vs PFD Calc
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
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
The clearest difference is ads: Prime Checker at none against PFD Calc's shown. Prime Checker also leads on iOS requirement (12.4 vs 15.0). PFD Calc's advantage is update cadence (every 5 weeks vs every 17 months). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Prime Checker ships an update every 17 months, PFD Calc every 5 weeks. The most recent releases landed on August 29, 2026 and September 17, 2026 respectively.
| Parameter | Prime Checker | PFD Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 95.8% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 17 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 12.4 — better | 15.0 |
| Further details — not scored | ||
| Size | 3 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Heart Solutions, Inc. | Kazuhisa Kobayashi |
In-app purchases
Prime Checker
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is Prime Checker free?
Is PFD Calc free?
Do Prime Checker or PFD Calc have ads?
Which is updated more often, Prime Checker or PFD Calc?
Other comparisons
