# HT_IoT vs InsideWater

The clearest difference is update cadence: InsideWater at every 3 months against HT_IoT's every 9 months. HT_IoT's advantage is device support and iOS requirement (8.0 vs 13.0). On price 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.

HT_IoT ships an update every 9 months, InsideWater every 3 months. The most recent releases landed on December 5, 2025 and September 10, 2026 respectively.

## The numbers

| Metric | HT_IoT | InsideWater |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 9 months | **Every 3 months** |
| Size | 42 MB | 31 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [艳涛 何](https://appshunter.io/developer/1594290094) | [AQUA SPA](https://appshunter.io/developer/1610112085) |

## What reviewers say

### HT_IoT

[App page](https://appshunter.io/ios/app/ht-iot/id1594424353)

**Features:** macOS Compatibility

**In-app purchases:** none


### InsideWater

[App page](https://appshunter.io/ios/app/insidewater/id6446782142)

**In-app purchases:** none


## Frequently asked questions

### Is HT_IoT free?

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

### Is InsideWater free?

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

### Which is updated more often, HT_IoT or InsideWater?

HT_IoT ships an update every 9 months, and InsideWater every 3 months. Most recently, HT_IoT was updated on December 5, 2025 and InsideWater on September 10, 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.*