# Prime Factorization vs Counter+.

The clearest difference is ads: Prime Factorization at none against Counter+.'s shown. Prime Factorization also leads on review sentiment (100% vs 84%) and monetization model (free vs ad-supported). Counter+.'s advantage is ratings volume (1.4K vs 5) and rating (4.7 vs 4.4). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Counter+. holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Counter+. has 1.4K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 100% of Prime Factorization's written reviews are positive against 84% of Counter+.'s, so the app with the better star average is not the one people write more warmly about.

Prime Factorization ships an update every 3 months, Counter+. every 4 months. The most recent releases landed on October 15, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Prime Factorization | Counter+. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (5 ratings)](https://appshunter.io/ios/app/prime-factorization/id528980227/reviews) | **[4.7 (1.4K ratings)](https://appshunter.io/ios/app/counter-plus/id986800297/reviews)** |
| Number of ratings | 5 | **1.4K** |
| Positive reviews | **100.0% of reviews** | 84.2% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | **Free** | Ad-supported |
| Size | 2 MB | 14 MB |
| Requires iOS | **8.0** | 12.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Sohei Mori](https://appshunter.io/developer/528980270) | [UniCom Technology](https://appshunter.io/developer/1270764210) |

## What reviewers say

### Prime Factorization

[App page](https://appshunter.io/ios/app/prime-factorization/id528980227)

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.

**Highlights:** Prime factorization of integers, Calculate number of divisors, Sum of divisors calculation, List all divisors, Identify prime numbers, Identify perfect, abundant, deficient numbers

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Counter+.

[App page](https://appshunter.io/ios/app/counter-plus/id986800297)

A straightforward tally counter designed for ease of use. It allows you to track anything with simple tap controls, offering haptic feedback and sound cues for each count. Save, share, and resume your counting sessions with this versatile utility.

**Highlights:** Save counted records, Share saved records, Vibrates on each count, Click sound on each count, Speaks count every 25 increments, Count up or down, Resume last counted numbers, Apple Watch compatibility

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 👍 Clear and straightforward
- 👍 Satisfying user experience
- 👍 Handy and useful tool
- 👍 Works well and is free

**What reviewers complain about**

- 🐛 Crashes at 1000 counts
- 💡 Needs ability to increase/decrease using volume buttons
- 🔍 Requests for feedback too frequent

**Reported bugs**

- Crashes at 1000 counts

**Requested features**

- Automatic counting feature
- Ability to remove ads


## Frequently asked questions

### Is Prime Factorization free?

Prime Factorization is free to download, with no in-app purchases.

### Is Counter+. free?

Counter+. is free to download, with no in-app purchases.

### Which has better reviews, Prime Factorization or Counter+.?

Counter+. is rated higher. Prime Factorization averages 4.4 out of 5 from 5 ratings, while Counter+. averages 4.7 from 1.4K ratings.

### Do Prime Factorization or Counter+. have ads?

Counter+. shows ads; Prime Factorization does not.

### Which is updated more often, Prime Factorization or Counter+.?

Prime Factorization ships an update every 3 months, and Counter+. every 4 months. Most recently, Prime Factorization was updated on October 15, 2026 and Counter+. on October 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*