# Prime Factors vs Montessori Math

The clearest difference is price: Montessori Math at Free against Prime Factors's $0.99. Montessori Math also leads on update cadence (every 3 months vs every 21 months) and iOS requirement (12.0 vs 18.0). Prime Factors's advantage is in-app purchases (none vs 2) and review sentiment (79% vs 50%). On ads and device support there is nothing between them.

Montessori Math is free to download; Prime Factors costs $0.99 up front. Montessori Math sells 2 in-app purchases, starting at $3.99 per month. Prime Factors asks for nothing beyond the download.

Prime Factors holds the better App Store score, 3.9 against 3.5. Both are backed by a comparable volume of ratings — 24 and 6 respectively. Written reviews point the same way: 79% of Prime Factors's written reviews are positive against 50% of Montessori Math's.

Prime Factors ships an update every 21 months, Montessori Math every 3 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Prime Factors | Montessori Math |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/prime-factors/id741746948/reviews)** | [3.5 (6 ratings)](https://appshunter.io/ios/app/montessori-math/id1528038775/reviews) |
| Number of ratings | **24** | 6 |
| Positive reviews | **78.6% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 385 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Paul Hangas](https://appshunter.io/developer/433121902) | [Rantek Inc.](https://appshunter.io/developer/319592818) |

## What reviewers say

### Prime Factors

[App page](https://appshunter.io/ios/app/prime-factors/id741746948)

Explore numbers up to one trillion, with primes clearly marked. Tap any number to reveal its prime factors. Easily navigate to specific numbers using the search function and adjust the display with pinch-to-zoom gestures.

**Highlights:** View numbers up to 1 trillion, Prime numbers highlighted, Tap for prime factors, Search for specific numbers, Pinch and zoom display

**Features:** macOS Compatibility

**In-app purchases:** none


### Montessori Math

[App page](https://appshunter.io/ios/app/montessori-math/id1528038775)

This app teaches math concepts for children aged 3 and up, from basic preschool skills to arithmetic. It features interactive activities like the Hundred Board and Fractions, designed with Montessori principles. Audio and graphics support non-readers.

**Highlights:** Interactive math activities, Montessori-inspired learning, Covers preschool to arithmetic, Audio and visual support, Self-correcting activities, Progress tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Montessori Math Monthly Sub. | $3.99 | per month |
| Montessori Math Yearly Sub. | $39.99 | per year |


## Frequently asked questions

### Is Prime Factors free?

Prime Factors costs $0.99, with no in-app purchases.

### Is Montessori Math free?

Montessori Math is free to download, with in-app purchases available.

### Which has better reviews, Prime Factors or Montessori Math?

Prime Factors is rated higher. Prime Factors averages 3.9 out of 5 from 24 ratings, while Montessori Math averages 3.5 from 6 ratings.

### Do Prime Factors or Montessori Math have ads?

Neither Prime Factors nor Montessori Math shows ads.

### Which is updated more often, Prime Factors or Montessori Math?

Prime Factors ships an update every 21 months, and Montessori Math every 3 months. Most recently, Prime Factors was updated on October 24, 2026 and Montessori Math on October 7, 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.*