# Kerk vs RKIN

The clearest difference is iOS requirement: Kerk at 5.1.1 against RKIN's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Kerk ships an update every 10 months, RKIN every 9 months. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Kerk | RKIN |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 9 months** |
| Monetization | — | Free |
| Size | 75 MB | 190 MB |
| Requires iOS | **5.1.1** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Kerk Comercial](https://appshunter.io/developer/1327483304) | [Hotworks](https://appshunter.io/developer/1188728106) |

## What reviewers say

### Kerk

[App page](https://appshunter.io/ios/app/kerk/id927044338)

**Features:** macOS Compatibility

**In-app purchases:** none


### RKIN

[App page](https://appshunter.io/ios/app/rkin/id6740370274)

Monitor your home's water and air quality in real-time. The app offers seamless device setup, timely filter replacement reminders, and customizable settings for personalized environmental control. Gain insights with detailed usage reports to ensure a healthy living space.

**Highlights:** Real-time water and air quality monitoring, Seamless device setup, Filter replacement reminders, Customizable appliance settings, Detailed usage reports, Personalized environmental control

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kerk free?

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

### Is RKIN free?

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

### Do Kerk or RKIN have ads?

Neither Kerk nor RKIN shows ads.

### Which is updated more often, Kerk or RKIN?

Kerk ships an update every 10 months, and RKIN every 9 months. Most recently, Kerk was updated on October 7, 2026 and RKIN on October 6, 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.*