Prime Cracker vs PFD Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prime Cracker
This app helps users explore the fascinating world of prime numbers. It allows you to check if a number is prime, find its factors, and discover nearby primes. You can also analyze ranges of numbers for primes and twin primes.
- Determine primality and factors
- Find prime position
- Explore nearby primes
- Check number ranges for primes
- Identify twin primes
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• Determine a number's primality, factors or prime position • Explore nearby prime numbers conveniently • Check ranges of numbers for primes and twin primes
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
The clearest difference is ads: Prime Cracker at none against PFD Calc's shown. Prime Cracker also leads on device support (5 vs 3). On price, update cadence, in-app purchases and iOS requirement 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 Cracker ships an update every 2 weeks, PFD Calc every 5 weeks. The most recent releases landed on September 25, 2026 and September 17, 2026 respectively.
| Parameter | Prime Cracker | PFD Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (31 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 31 — better | — |
| Update frequency | Every 2 weeks — better | Every 5 weeks |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 6 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Sven Freitag | Kazuhisa Kobayashi |
In-app purchases
Prime Cracker
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is Prime Cracker free?
Is PFD Calc free?
Do Prime Cracker or PFD Calc have ads?
Which is updated more often, Prime Cracker or PFD Calc?
Other comparisons
