Simple Factors vs PFD Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simple Factors
This app helps users understand numbers by providing their factors and checking for primality or divisibility. It offers a straightforward interface for quick calculations up to 10 trillion.
- Calculates factors of numbers
- Checks for primality
- Determines divisibility
- Supports numbers up to 10 trillion
- Simple, menu-free interface
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Whether you need help with math or just like playing with numbers, Simple Factors is for you! Gives the factors of numbers up to 10 trillion! Helps you know if a number is prime, divisible by another number, etc. No menus to slow you down...simply open and use! Jesus loves you!
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
The clearest difference is price: PFD Calc at Free against Simple Factors's $0.99. PFD Calc also leads on update cadence (every 5 weeks vs every 20 months). Simple Factors's advantage is ads (none vs shown). On in-app purchases, device support 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
PFD Calc is free to download; Simple Factors costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Simple Factors ships an update every 20 months, PFD Calc every 5 weeks. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.
| Parameter | Simple Factors | PFD Calc |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.8 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 20 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Joseph Palmer | Kazuhisa Kobayashi |
In-app purchases
Simple Factors
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is Simple Factors free?
Is PFD Calc free?
Do Simple Factors or PFD Calc have ads?
Which is updated more often, Simple Factors or PFD Calc?
Other comparisons
