# Prime number Snake Panic vs PFD Calc

The clearest difference is update cadence: Prime number Snake Panic at fortnightly against PFD Calc's every 5 weeks. Prime number Snake Panic also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Prime number Snake Panic ships an update fortnightly, PFD Calc every 5 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Prime number Snake Panic | PFD Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (11 ratings)](https://appshunter.io/ios/app/prime-number-snake-panic/id1595460548/reviews)** | — |
| Number of ratings | **11** | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Ad-supported | — |
| Size | 64 MB | 14 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ikeda tomoki](https://appshunter.io/developer/1538370047) | [Kazuhisa Kobayashi](https://appshunter.io/developer/1580882000) |

## What reviewers say

### Prime number Snake Panic

[App page](https://appshunter.io/ios/app/prime-number-snake-panic/id1595460548)

Practice identifying prime numbers through an engaging game. Tap for primes and swipe for non-primes, which then decompose into a snake-like sequence. Compete globally for the highest score.

**Highlights:** Prime number identification, Number decomposition, Snake-like gameplay, High score tracking, Worldwide ranking

**Features:** macOS Compatibility

**In-app purchases:** none


### PFD Calc

[App page](https://appshunter.io/ios/app/pfd-calc-prime-factorization/id6737405828)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Prime number Snake Panic free?

Prime number Snake Panic is free to download, with no in-app purchases.

### Is PFD Calc free?

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

### Do Prime number Snake Panic or PFD Calc have ads?

Both Prime number Snake Panic and PFD Calc show ads.

### Which is updated more often, Prime number Snake Panic or PFD Calc?

Prime number Snake Panic ships an update fortnightly, and PFD Calc every 5 weeks. Most recently, Prime number Snake Panic was updated on November 3, 2026 and PFD Calc on November 4, 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.*