# MSDC vs PFD Calc

The clearest difference is ads: MSDC at none against PFD Calc's shown. MSDC also leads on update cadence (every 2 weeks vs every 5 weeks) and iOS requirement (11.0 vs 15.0). On price, 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.

MSDC ships an update every 2 weeks, PFD Calc every 5 weeks. The most recent releases landed on October 19, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | MSDC | PFD Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Size | 11 MB | 14 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [YouTeacher Inc.](https://appshunter.io/developer/423093933) | [Kazuhisa Kobayashi](https://appshunter.io/developer/1580882000) |

## What reviewers say

### MSDC

[App page](https://appshunter.io/ios/app/msdc/id1416976829)

**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 MSDC free?

MSDC 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 MSDC or PFD Calc have ads?

PFD Calc shows ads; MSDC does not.

### Which is updated more often, MSDC or PFD Calc?

MSDC ships an update every 2 weeks, and PFD Calc every 5 weeks. Most recently, MSDC was updated on October 19, 2026 and PFD Calc on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*