# H2O Precision Moisture Sensor vs SentryBlack

The clearest difference is in-app purchases: H2O Precision Moisture Sensor at none against SentryBlack's 2. H2O Precision Moisture Sensor also leads on ads (none vs shown) and iOS requirement (12.0 vs 17.0). SentryBlack's advantage is update cadence (fortnightly vs every 6 months). On price and device support there is nothing between them.

Both are free to download. SentryBlack sells 2 in-app purchases, starting at $4.99 per month. H2O Precision Moisture Sensor asks for nothing beyond the download.

H2O Precision Moisture Sensor ships an update every 6 months, SentryBlack fortnightly. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | H2O Precision Moisture Sensor | SentryBlack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/h2o-precision-moisture-sensor/id1380753307/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 67 MB | 17 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Harvest Tec, Inc](https://appshunter.io/developer/975695298) | [Matthew Wong](https://appshunter.io/developer/6774040057) |

## What reviewers say

### H2O Precision Moisture Sensor

[App page](https://appshunter.io/ios/app/h2o-precision-moisture-sensor/id1380753307)

This app connects wirelessly to a moisture sensor to provide round baler operators with accurate hay moisture readings up to 60%. It utilizes patented technology to read moisture across the bale's width, displaying results on a smartphone or tablet.

**Highlights:** Accurate hay moisture readings up to 60%, Patented side-to-side moisture reading technology, Wireless Bluetooth connectivity, Uses smartphone or tablet as monitor, Reads moisture across bale width

**Features:** macOS Compatibility

**In-app purchases:** none


### SentryBlack

[App page](https://appshunter.io/ios/app/sentryblack-security-camera/id6790313702)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SentryBlack Pro (Monthly) | $4.99 | per month |
| SentryBlack Pro (Yearly) | $29.99 | per year |


## Frequently asked questions

### Is H2O Precision Moisture Sensor free?

H2O Precision Moisture Sensor is free to download, with no in-app purchases.

### Is SentryBlack free?

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

### Do H2O Precision Moisture Sensor or SentryBlack have ads?

SentryBlack shows ads; H2O Precision Moisture Sensor does not.

### Which is updated more often, H2O Precision Moisture Sensor or SentryBlack?

H2O Precision Moisture Sensor ships an update every 6 months, and SentryBlack fortnightly. Most recently, H2O Precision Moisture Sensor was updated on October 1, 2026 and SentryBlack on October 3, 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.*