# Smart Humidifier Pro vs LineConstants

The clearest difference is in-app purchases: Smart Humidifier Pro at none against LineConstants's 2. Smart Humidifier Pro also leads on iOS requirement (11.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. LineConstants sells 2 in-app purchases, starting at $9.99 per month. Smart Humidifier Pro asks for nothing beyond the download.

Smart Humidifier Pro ships an update monthly, LineConstants every 2 months. The most recent releases landed on October 12, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Smart Humidifier Pro | LineConstants |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/smart-humidifier-pro/id1668976459/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | — |
| Size | 39 MB | 33 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [易客创新(泉州)智能科技有限公司](https://appshunter.io/developer/1683294855) | [Sergey Gussev](https://appshunter.io/developer/1784439395) |

## What reviewers say

### Smart Humidifier Pro

[App page](https://appshunter.io/ios/app/smart-humidifier-pro/id1668976459)

Control your anti-gravity humidifier remotely. Adjust settings, monitor air quality, and manage your device's environment from your smartphone.

**Highlights:** Remote humidifier control, Anti-gravity functionality, Air quality monitoring, Device environment management, Smartphone integration

**Features:** macOS Compatibility

**In-app purchases:** none


### LineConstants

[App page](https://appshunter.io/ios/app/lineconstants/id6740081204)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Yearly | $19.99 | per year |


## Frequently asked questions

### Is Smart Humidifier Pro free?

Smart Humidifier Pro is free to download, with no in-app purchases.

### Is LineConstants free?

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

### Do Smart Humidifier Pro or LineConstants have ads?

Neither Smart Humidifier Pro nor LineConstants shows ads.

### Which is updated more often, Smart Humidifier Pro or LineConstants?

Smart Humidifier Pro ships an update monthly, and LineConstants every 2 months. Most recently, Smart Humidifier Pro was updated on October 12, 2026 and LineConstants on October 28, 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.*