H2O Precision Moisture Sensor vs SentryBlack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
H2O Precision Moisture Sensor
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.
- 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
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The H2O Precision Moisture Sensor allows round baler operators to accurately and efficiently read hay moisture up to 60%. Using the patented side-to-side moisture reading technology, the sensor reads the moisture across the width of the bale in the chamber via moisture sensing discs mounted on the chamber walls. The sensor will read crop moisture from 8% up to 60%, for those customers that make high moisture bales as well as dry bales. The H2O Precision Moisture Sensor uses the operators smartphone or tablet as the monitor, connecting wirelessly via Bluetooth, and using the free H2O app from Harvest Tec.
SentryBlack
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Turn your own iPhone, iPad, or Mac into a private home security camera. Set an old device to watch a room and its screen dims to a discreet dark monitor view — one that always shows a clear recording indicator, so it is never hidden — while it detects motion, saves event clips, and streams live to your other devices. Wake it any time with a press-and-hold. PRIVATE BY DESIGN Unlike typical CCTV apps, SentryBlack has no company servers watching your home. Your video stays on YOUR devices and YOUR own private iCloud — never our cloud, and never a third-party cloud you did not choose. • Live view goes device-to-device and is end-to-end encrypted. • If your network blocks a direct connection, you can optionally add a relay server of your own — the video through it stays end-to-end encrypted and the relay cannot decrypt it. SentryBlack provides no relay server, and this setting is off unless you fill it in. • Cameras, motion alerts, and clips sync only through your private iCloud. • No account, no sign-up, no tracking. USE ANY DEVICE AS A CAMERA • The screen dims to a dark monitor view with an always-on "REC" indicator and timer — discreet and power-saving, but never blank. • On-device motion detection saves a clip and snapshot of every event. • Press and hold to wake the screen. MONITOR FROM ANYWHERE • On another device signed into the same iCloud, tap Monitor to see all your cameras. • Get instant push alerts with a snapshot the moment motion is detected. • Watch live video — fastest on the same Wi-Fi, and end-to-end encrypted everywhere. SENTRYBLACK PRO The free version records with motion detection, sends cross-device alerts, and streams live on your Wi-Fi (with a small banner ad on non-camera screens; iPhone and iPad only — the Mac app has no ads). SentryBlack Pro adds: • Cloud clip backup to your own iCloud • Unlimited event history • HD live view • Person detection & motion zones • Multiple cameras • No ads Pro is an auto-renewing subscription (monthly or yearly) with a 3-day free trial. One subscription works on iPhone, iPad, and Mac. Payment is charged to your Apple Account; it renews automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in Settings. Note: because Apple stops the camera when an app is in the background or the device is locked, a camera device must stay on and in the app while on duty — keeping it plugged in is recommended. Please use SentryBlack only to monitor your own property and spaces. Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://mwsupplylimited.github.io/sentryblack/privacy.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | H2O Precision Moisture Sensor | SentryBlack |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 6 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 67 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Harvest Tec, Inc | Matthew Wong |
In-app purchases
H2O Precision Moisture Sensor
No in-app purchases
SentryBlack
- SentryBlack Pro (Monthly)3 Days trial$4.991 Month
- SentryBlack Pro (Yearly)3 Days trial$29.991 Year
Questions
Is H2O Precision Moisture Sensor free?
Is SentryBlack free?
Do H2O Precision Moisture Sensor or SentryBlack have ads?
Which is updated more often, H2O Precision Moisture Sensor or SentryBlack?
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