# Calculator + vs Prime Factorization

The clearest difference is in-app purchases: Prime Factorization at none against Calculator +'s 12. Prime Factorization also leads on ads (none vs shown) and review sentiment (100% vs 85%). Calculator +'s advantage is update cadence (every 5 days vs every 3 months) and ratings volume (10K vs 5). On price and device support there is nothing between them.

Both are free to download. Calculator + sells 12 in-app purchases, starting at $4.99 per month. Prime Factorization asks for nothing beyond the download.

Calculator + holds the better App Store score, 4.6 against 4.4. That said, the two scores are not equally well evidenced: Calculator + has 10K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 85% of Calculator +'s written reviews are positive against 100% of Prime Factorization's, so the app with the better star average is not the one people write more warmly about.

Calculator + ships an update every 5 days, Prime Factorization every 3 months. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Calculator + | Prime Factorization |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (10K ratings)](https://appshunter.io/ios/app/calculator-plus/id351815470/reviews)** | [4.4 (5 ratings)](https://appshunter.io/ios/app/prime-factorization/id528980227/reviews) |
| Number of ratings | **10K** | 5 |
| Positive reviews | 84.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 49 MB | 2 MB |
| Requires iOS | 16.4 | **8.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [xNeat.com](https://appshunter.io/developer/327498295) | [Sohei Mori](https://appshunter.io/developer/528980270) |

## What reviewers say

### Calculator +

[App page](https://appshunter.io/ios/app/calculator-plus/id351815470)

This app offers a free basic and scientific calculator with an intuitive interface. It supports fractions, percentages, and advanced editing. Optional upgrades provide specialized calculators for fractions with units, polynomial and linear equation solving, graphing, and geometric shapes.

**Highlights:** Free basic and scientific calculator, Intuitive interface with equation and result display, Fraction and percent support, Advanced editing capabilities, Polynomial and linear equation solver, Graphing calculator, Unit conversion and geometric calculators

**Features:** Vision Pro support

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific Calculator | $4.99 | per month |
| Calculator | $39.99 | per year |
| Linear Calculator | $2.99 | one-time |
| Factoring Calculator | $2.99 | one-time |
| Handwriting Calculator | $2.99 | one-time |
| Currency Converter | $2.99 | one-time |
| Themes Pack | $2.99 | one-time |
| Graphing Calculator | $3.99 | one-time |
| Fraction Calculator | $3.99 | one-time |
| Scientific Calculator | $4.99 | one-time |
| Calculator Plus | $4.99 | one-time |
| Calculator | $16.99 | one-time |

**What reviewers like**

- 👍 Great features and easy to use
- 👍 Efficient and quick
- 👍 Versatile, functional calculator
- 👍 Fantastic, easy to use app
- 👍 Awesome calculator app

**What reviewers complain about**

- 🐛 New updated layout is awful
- 🐛 App is now terrible
- 🔒 Paying customer screwed over by update
- 🔒 Now timed trial, no free w/ads version
- 🔒 Not honest

**Reported bugs**

- Fraction calculator has TWO subtraction buttons and NO division button
- Decimals seem to be changed to fraction with no apparent way of changing it back
- Functionality is dropped by forcing you to the main menu every time you open it
- Currency converter broken
- Login screen freezes

**Requested features**

- Add mod function
- Add commas
- Add 1/x function
- Support for Retina Display
- Add number 4 with two lines


### 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


## Frequently asked questions

### Is Calculator + free?

Calculator + is free to download, with in-app purchases available.

### Is Prime Factorization free?

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

### Which has better reviews, Calculator + or Prime Factorization?

Calculator + is rated higher. Calculator + averages 4.6 out of 5 from 10K ratings, while Prime Factorization averages 4.4 from 5 ratings.

### Do Calculator + or Prime Factorization have ads?

Calculator + shows ads; Prime Factorization does not.

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

Calculator + ships an update every 5 days, and Prime Factorization every 3 months. Most recently, Calculator + was updated on October 25, 2026 and Prime Factorization on October 15, 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.*