# Orpheo vs Kaimai

The clearest difference is update cadence: Kaimai at every 2 months against Orpheo's every 6 months. Orpheo's advantage is iOS requirement (8.0 vs 15.1). 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.

Orpheo ships an update every 6 months, Kaimai every 2 months. The most recent releases landed on October 10, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Orpheo | Kaimai |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 112 MB | 39 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CCEI](https://appshunter.io/developer/468677300) | [JCM Technologies S.A.](https://appshunter.io/developer/1475472503) |

## What reviewers say

### Orpheo

[App page](https://appshunter.io/ios/app/orpheo/id1235085282)

This app helps regulate pH and ORP levels, ideal for liquid chlorine treatment systems. An optional chamber simplifies installation by combining measurement and injection.

**Highlights:** pH regulation, ORP regulation, Liquid chlorine treatment integration, Optional ZeliaPod measuring chamber, Flow sensor integration

**Features:** macOS Compatibility

**In-app purchases:** none


### Kaimai

[App page](https://appshunter.io/ios/app/kaimai/id6451405165)

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

**In-app purchases:** none


## Frequently asked questions

### Is Orpheo free?

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

### Is Kaimai free?

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

### Do Orpheo or Kaimai have ads?

Neither Orpheo nor Kaimai shows ads.

### Which is updated more often, Orpheo or Kaimai?

Orpheo ships an update every 6 months, and Kaimai every 2 months. Most recently, Orpheo was updated on October 10, 2026 and Kaimai on October 27, 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.*