# myHarkness Calculator vs KDM Reader

The clearest difference is update cadence: KDM Reader at every 3 weeks against myHarkness Calculator's every 3 months. myHarkness Calculator's advantage is iOS requirement (11.0 vs 16.0). 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.

myHarkness Calculator ships an update every 3 months, KDM Reader every 3 weeks. The most recent releases landed on September 20, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | myHarkness Calculator | KDM Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kdm-reader/id6476420239/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 79 MB | 1 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Harkness Screens Ltd](https://appshunter.io/developer/987523118) | [Center Point Post](https://appshunter.io/developer/1726641663) |

## What reviewers say

### myHarkness Calculator

[App page](https://appshunter.io/ios/app/myharkness-calculator/id792736941)

**In-app purchases:** none


### KDM Reader

[App page](https://appshunter.io/ios/app/kdm-reader/id6476420239)

Easily verify KDM validity times, content version, and target DCP player. View information in your local timezone or UTC.

**Highlights:** Verify KDM validity times, Check content version, Identify target DCP player, View in local timezone, View in UTC

**In-app purchases:** none


## Frequently asked questions

### Is myHarkness Calculator free?

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

### Is KDM Reader free?

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

### Do myHarkness Calculator or KDM Reader have ads?

Neither myHarkness Calculator nor KDM Reader shows ads.

### Which is updated more often, myHarkness Calculator or KDM Reader?

myHarkness Calculator ships an update every 3 months, and KDM Reader every 3 weeks. Most recently, myHarkness Calculator was updated on September 20, 2026 and KDM Reader on June 5, 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.*