# IRIS SmartST vs Absolute Humidity

The clearest difference is review sentiment: Absolute Humidity at 80% against IRIS SmartST's 5%. IRIS SmartST's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Absolute Humidity sells 2 in-app purchases, starting at $1.99 per month. IRIS SmartST asks for nothing beyond the download.

IRIS SmartST ships an update monthly, Absolute Humidity every 5 weeks. The most recent releases landed on September 19, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | IRIS SmartST | Absolute Humidity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/absolute-humidity/id1640356804/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 5.0% of reviews | **80.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 12 MB |
| Requires iOS | **13.2** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [IRIS OHYAMA INC.](https://appshunter.io/developer/1354368086) | [Yuta Hirobe](https://appshunter.io/developer/572236713) |

## What reviewers say

### IRIS SmartST

[App page](https://appshunter.io/ios/app/iris-smartst/id1508483621)

This app helps you set up your smart speaker by registering your home WiFi information and choosing a voice command name. It facilitates the initial configuration for seamless integration with your smart home devices.

**Highlights:** Smart speaker initial setup, WiFi information registration, Voice command name setup, Device integration

**In-app purchases:** none


### Absolute Humidity

[App page](https://appshunter.io/ios/app/absolute-humidity/id1640356804)

This app calculates and displays absolute humidity using temperature and relative humidity data from connected devices. It helps users understand their environmental comfort level with numerical values and visuals. A Pro version offers weather forecasts for any location.

**Highlights:** Absolute humidity calculation, Supports HomeKit & SwitchBot meters, Comfort level visualization, Weather information (Pro version), Volumetric & gravimetric humidity display, Ad-free experience (Pro version)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $1.99 | per month |
| Annual Plan | $17.49 | per year |


## Frequently asked questions

### Is IRIS SmartST free?

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

### Is Absolute Humidity free?

Absolute Humidity is free to download, with in-app purchases available.

### Do IRIS SmartST or Absolute Humidity have ads?

Absolute Humidity shows ads; IRIS SmartST does not.

### Which is updated more often, IRIS SmartST or Absolute Humidity?

IRIS SmartST ships an update monthly, and Absolute Humidity every 5 weeks. Most recently, IRIS SmartST was updated on September 19, 2026 and Absolute Humidity on September 13, 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.*