# Mersenne Primes vs 心流.

The clearest difference is update cadence: Mersenne Primes at weekly against 心流.'s every 5 weeks. Mersenne Primes also leads on iOS requirement (9.0 vs 15.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Mersenne Primes sells 1 one-off in-app purchase and 心流. sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Mersenne Primes ships an update weekly, 心流. every 5 weeks. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Mersenne Primes | 心流. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mersenne-primes/id1362004527/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 weeks |
| Monetization | Free with in-app purchases | Freemium |
| Size | 60 MB | 171 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [华 魏](https://appshunter.io/developer/454719266) | [Shanghai Xiaochuang Technology Co.,Ltd](https://appshunter.io/developer/1524186984) |

## 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 |


### 心流.

[App page](https://appshunter.io/ios/app/id1535657903)

This app helps users cultivate positive self-talk and overcome negative thought patterns through daily affirmations. It allows for personalized quote categories and reminders to build a supportive personal environment for achieving goals and strengthening resilience.

**Highlights:** Daily positive affirmations, Overcome negative thoughts, Build positive self-talk, Personalized quote categories, Set reminders and push notifications, Strengthen subconscious connection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 心流月度会员 | $0.99 | per month |
| 心流年度会员(有折扣) | $3.99 | per year |
| 心流年度会员(无折扣) | $4.99 | per year |


## Frequently asked questions

### Is Mersenne Primes free?

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

### Is 心流. free?

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

### Do Mersenne Primes or 心流. have ads?

Neither Mersenne Primes nor 心流. shows ads.

### Which is updated more often, Mersenne Primes or 心流.?

Mersenne Primes ships an update weekly, and 心流. every 5 weeks. Most recently, Mersenne Primes was updated on October 16, 2026 and 心流. on October 24, 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.*