World Time Check vs Prime Factorization
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
World Time Check
Easily view and compare current times across multiple global cities simultaneously. This utility helps you coordinate international meetings or plan travel by showing time differences with intuitive scrolling and real-time synchronization.
- Multiple cities at once
- Real-time sync
- Check future times
- Easy city search
- Custom date & time
- Daylight saving support
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View times from cities around the world in a single list and check time differences with intuitive scrolling. Perfect for coordinating international meetings or planning trips abroad. See the flow of time across multiple cities simultaneously. 【Key Features】 ◆ Multiple Cities at Once No limit on cities you can add. View them all with horizontal scrolling. ◆ Real-Time Sync Auto-scroll to current time when real-time mode is enabled. ◆ Check Future Times Scroll vertically to see upcoming times for each region. ◆ Easy City Search Search by city name or quickly select from your history. ◆ Custom Date & Time Set a specific date and time to see corresponding times in all regions. ◆ Daylight Saving Support DST periods are visually highlighted in pink.
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".
Screenshots
Verdict
The clearest difference is review sentiment: Prime Factorization at 100% against World Time Check's 14%. Prime Factorization also leads on price (Free vs $0.99) and rating (4.4 vs 1.0). On update cadence, ads, 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
Prime Factorization is free to download; World Time Check costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Prime Factorization holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Prime Factorization has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 14% of World Time Check's written reviews are positive against 100% of Prime Factorization's.
World Time Check ships an update every 5 months, Prime Factorization every 3 months. The most recent releases landed on September 24, 2026 and September 30, 2026 respectively.
| Parameter | World Time Check | Prime Factorization |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.4 (5 ratings) — better |
| Positive reviews | 14.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.5 | 8.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | SHUJI FUKUNAGA | Sohei Mori |
Customer experience
World Time Check
Prime Factorization
In-app purchases
World Time Check
No in-app purchases
Prime Factorization
No in-app purchases
Questions
Is World Time Check free?
Is Prime Factorization free?
Which has better reviews, World Time Check or Prime Factorization?
Do World Time Check or Prime Factorization have ads?
Which is updated more often, World Time Check or Prime Factorization?
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