HydraGO vs CTT Mobile
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HydraGO
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Take soil measurements anywhere for those applications not requiring a permanent soil monitoring system. Your iOS device communicates wirelessly with the HydraGO / HydraGO Flex using bluetooth. Simply insert the probe into the soil, and tap the “Sample” button in the HydraGO app. The app will display soil moisture content, temperature, conductivity, and dielectric permittivity on-screen for immediate viewing. The date and time of each measurement are recorded along with the soil measurement data and the GPS location measured by your smartphone’s GPS receiver (HydraGO) or automotive-grade GPS receiver (HydraGO Flex). All data can be saved and emailed as a .CSV file for analysis in Excel. Notes and location names can be added to the data records. HydraGO / HydraGO Flex uses the same patented soil sensor as the HydraProbe.
CTT Mobile
Monitor real-time telemetry from your CTT devices. Adjust device duty cycles and connect to Bluetooth-enabled products like the Sidekick and Node Version 3.
- View latest telemetry data
- Assign device duty cycle changes
- Connect to Bluetooth enabled CTT products
- Monitor Sidekick and Node Version 3
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CTT Mobile allows you to view the latest telemetry data from your CTT devices on your mobile device. In addition you can use CTT Mobile to assign device duty cycle changes and connect to Bluetooth enabled CTT products such as the Sidekick and Node Version 3.
Screenshots
Verdict
The clearest difference is update cadence: CTT Mobile at every 2 months against HydraGO's every 24 months. HydraGO's advantage is iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
HydraGO ships an update every 24 months, CTT Mobile every 2 months. The most recent releases landed on October 17, 2026 and October 14, 2026 respectively.
| Parameter | HydraGO | CTT Mobile |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (7 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 7 — better |
| Update frequency | Every 24 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 5 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | Stevens Water Monitoring Systems, Inc. | Cellular Tracking Technologies |
In-app purchases
HydraGO
No in-app purchases
CTT Mobile
No in-app purchases
