# Mersenne Primes vs Dianetics

The clearest difference is in-app purchases: Dianetics at none against Mersenne Primes's 1. Dianetics also leads on ratings volume (30 vs 1) and update cadence (every 3 days vs weekly). Mersenne Primes's advantage is iOS requirement (9.0 vs 13.4). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Mersenne Primes sells 1 one-off in-app purchase. Dianetics asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Mersenne Primes against 4.9 for Dianetics. That said, the two scores are not equally well evidenced: Dianetics has 30 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Mersenne Primes ships an update weekly, Dianetics every 3 days. The most recent releases landed on September 30, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Mersenne Primes | Dianetics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mersenne-primes/id1362004527/reviews)** | [4.9 (30 ratings)](https://appshunter.io/ios/app/dianetics/id6745197076/reviews) |
| Number of ratings | 1 | **30** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 60 MB | 102 MB |
| Requires iOS | **9.0** | 13.4 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 17+ |
| Developer | [华 魏](https://appshunter.io/developer/454719266) | [Church of Scientology International](https://appshunter.io/developer/412117484) |

## What reviewers say

### Mersenne Primes

[App page](https://appshunter.io/ios/app/mersenne-primes/id1362004527)

Explore and view the digits of all known Mersenne prime numbers. Witness the generation process for extremely large primes, page by page, and locate specific digits by their sequence number.

**Highlights:** View all digits of known Mersenne Primes, Witness prime number generation process, Page-by-page digit exploration, Locate specific digits by sequence number, Generates primes using mobile CPU

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Support | $0.99 | one-time |


### Dianetics

[App page](https://appshunter.io/ios/app/dianetics/id6745197076)

Access the 75th Anniversary Edition of a groundbreaking book on the human mind, available as an eBook and digital audiobook. This app provides early access and synchronized reading/listening across all your devices with a required unlock code.

**Highlights:** Exclusive early access to 75th Anniversary Edition, Full official eBook optimized for mobile, Complete digital audiobook edition, Cross-device synchronization, Practical step-by-step method for mental clarity

**In-app purchases:** none


## Frequently asked questions

### Is Mersenne Primes free?

Mersenne Primes is free to download, with in-app purchases available.

### Is Dianetics free?

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

### Which has better reviews, Mersenne Primes or Dianetics?

Mersenne Primes is rated higher. Mersenne Primes averages 5.0 out of 5 from 1 ratings, while Dianetics averages 4.9 from 30 ratings.

### Do Mersenne Primes or Dianetics have ads?

Neither Mersenne Primes nor Dianetics shows ads.

### Which is updated more often, Mersenne Primes or Dianetics?

Mersenne Primes ships an update weekly, and Dianetics every 3 days. Most recently, Mersenne Primes was updated on September 30, 2026 and Dianetics on October 14, 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.*