Prime Factorization vs Stopwatch Library
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prime Factorization
This utility app breaks down integers into their prime factors. It also calculates the number and sum of divisors, lists all divisors, and identifies specific number types like prime, perfect, abundant, or deficient.
- Prime factorization of integers
- Calculate number of divisors
- Sum of divisors calculation
- List all divisors
- Identify prime numbers
- Identify perfect, abundant, deficient numbers
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This app factorize inputted integer to primes. You can input and factorize any integers under 100 million. App will show below result. * The result of prime factorization * The number of divisors * The sum total of divisors * All Divisors In addition, you can know which inputted number is "Prime number", "Perfect Number", "Multipru Perfect Number", "Abundant Number"or "Dificient Number".
Stopwatch Library
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複数のストップウォッチを表示させることができます。 アナログかデジタルかは選んでください。
Screenshots
Verdict
The clearest difference is in-app purchases: Prime Factorization at none against Stopwatch Library's 1. Prime Factorization also leads on iOS requirement (8.0 vs 17.0). Stopwatch Library's advantage is update cadence (every 3 days vs every 3 months). On price, ads 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. Stopwatch Library sells 1 one-off in-app purchase. Prime Factorization asks for nothing beyond the download.
Prime Factorization ships an update every 3 months, Stopwatch Library every 3 days. The most recent releases landed on September 30, 2026 and September 28, 2026 respectively.
| Parameter | Prime Factorization | Stopwatch Library |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 3 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Sohei Mori | Naoyuki Hasegawa |
In-app purchases
Prime Factorization
No in-app purchases
Stopwatch Library
- 広告を削除$2.99
Questions
Is Prime Factorization free?
Is Stopwatch Library free?
Do Prime Factorization or Stopwatch Library have ads?
Which is updated more often, Prime Factorization or Stopwatch Library?
Other comparisons
