# K.O. II Calc. vs EMF Meter

The clearest difference is price: K.O. II Calc. at Free against EMF Meter's $0.99. K.O. II Calc. also leads on update cadence (monthly vs every 2 months). EMF Meter's advantage is in-app purchases (none vs 2) and device support (3 vs 1). On ads there is nothing between them.

K.O. II Calc. is free to download; EMF Meter costs $0.99 up front. K.O. II Calc. sells 2 one-off in-app purchases. EMF Meter asks for nothing beyond the download.

K.O. II Calc. ships an update monthly, EMF Meter every 2 months. The most recent releases landed on October 14, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | K.O. II Calc. | EMF Meter |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | — | Paid |
| Size | 1 MB | 58 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jesus Evert Corral Pedraza](https://appshunter.io/developer/1777466218) | [PPLST Tech](https://appshunter.io/developer/1832748300) |

## What reviewers say

### K.O. II Calc.

[App page](https://appshunter.io/ios/app/ko-ii-calc/id6752974851)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Espresso coffee | $1.99 | one-time |
| Cappuccino coffee | $2.99 | one-time |


### EMF Meter

[App page](https://appshunter.io/ios/app/emf-meter/id6756597802)

Monitor electromagnetic field levels and Bluetooth exposure with real-time readings and safety zone indicators. Understand signal strength and exposure levels around you for awareness at home, work, or while traveling.

**Highlights:** Real-time EMF readings, Bluetooth device scanning, Signal strength in dBm, Safety zone indicators, Visual EMF analytics, Dark and light themes

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

**In-app purchases:** none


## Frequently asked questions

### Is K.O. II Calc. free?

K.O. II Calc. is free to download, with in-app purchases available.

### Is EMF Meter free?

EMF Meter costs $0.99, with no in-app purchases.

### Do K.O. II Calc. or EMF Meter have ads?

Neither K.O. II Calc. nor EMF Meter shows ads.

### Which is updated more often, K.O. II Calc. or EMF Meter?

K.O. II Calc. ships an update monthly, and EMF Meter every 2 months. Most recently, K.O. II Calc. was updated on October 14, 2026 and EMF Meter on November 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.*