Find Prime Num vs PFD Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Find Prime Num
Quickly determine if a number is prime and find one of its factors. This app also measures calculation time to help you benchmark your device's processing speed. Share your results and compare performance with others.
- Calculate prime numbers up to 64-bit integers
- Measure processing time for device speed comparison
- Find one factor of a non-prime number
- Share calculation results
- User-friendly interface
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Do you want to find out if a number if a prime number? Are you constantly spending hours to calculate if a long number is prime? If the answer is yes for any of these questions, you should download "Find Prime Num" app. "Find Prime Num" allows you to find out if a number is a prime or not. It will also give you a factor of this number. In addition, it will tell you how long it takes for the app to calculate, which indicates how fast your device is. You can use this value to test your device's processing speed against other devices. "Find Prime Num" is an app for you to find out if your number is prime. It can be used on iPhone, iPod Touch and iPad. It is simple, easy to use, and very informative. You can share your results with others as well. Main Features ◉ Calculate prime number up to 64-bit integer ◉ Calculate the processing time, an indicator of the speed of the CPU of your device ◉ Calculate one factor of your number if it isn't a prime ◉ Share your results with others to see whose devices are faster ◉ User-friendly interface
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
The clearest difference is ads: Find Prime Num at none against PFD Calc's shown. Find Prime Num also leads on update cadence (every 4 days vs every 5 weeks) and iOS requirement (12.0 vs 15.0). 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.
Find Prime Num ships an update every 4 days, PFD Calc every 5 weeks. The most recent releases landed on September 10, 2026 and September 17, 2026 respectively.
| Parameter | Find Prime Num | PFD Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 days — better | Every 5 weeks |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 8 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Duo Pisceses, Inc. | Kazuhisa Kobayashi |
In-app purchases
Find Prime Num
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is Find Prime Num free?
Is PFD Calc free?
Do Find Prime Num or PFD Calc have ads?
Which is updated more often, Find Prime Num or PFD Calc?
Other comparisons
