Geosensors vs HydroData
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Geosensors
This application works with specialized hardware to conduct geophysical surveys. It allows users to monitor live sensor data, set up and record surveys, and transfer completed data for further analysis. Users can also modify sensor and logger configurations.
- Connect to Geosensors Logger via WiFi
- Monitor live EM and GPS data
- View sensor auxiliary data
- Resume incomplete surveys
- Modify sensor and logger configurations
- Download and email survey data
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The Geosensors app is the companion to the Geosensors Logger hardware that together make up a powerful geophysical surveying tool. The logger connects to an electromagnetic sensor and an external GPS device in order to provide all the information necessary to carry out a successful geophysical survey. The app connects to the logger via WiFi and allows a surveyor to monitor live data from the EM sensor, set-up and record a new survey, transfer completed survey data to the app, view the summary details and then email the data for further processing on a desktop computer. Note that to get the best use out of this app, it must be connected to a Geosensors Logger. Please contact us if you need to purchase a logger and/or EM sensor. Features: - Connect to a Geosensors Logger via WiFi - View EM and GPS data as it is being recorded to the logger. GPS data is shown on the map. - View auxiliary data from the EM sensor such as battery level, tilt and rotation angles and temperature. - Resume incomplete surveys - Use the terminal to modify internal EM sensor configuration settings - Modify the logger configuration settings such as sensor baud rates, device name, WiFi security - Download previous surveys from the logger to the app. Downloaded surveys can reviewed in app and then emailed as an attachment
HydroData
This app enables field data collection with map integration to pinpoint features and track your location. It supports gathering field reports, well water levels, and dam inspection data, syncing it all to the cloud when convenient.
- Field data collection
- Map-based feature selection
- Location tracking
- Cloud synchronization
- Well water level logging
- Dam inspection reports
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The application allows you to collect information within the field and then sync back to the cloud whenever you are ready. This includes a full map to select the feature while seeing your location on the map as well. It will also allow you to collect field reports, well water levels, and dam inspections.
Screenshots
Verdict
The clearest difference is rating: Geosensors at 5.0 against HydroData's 2.6. Geosensors also leads on iOS requirement (10.3 vs 17.6). HydroData's advantage is ratings volume (5 vs 1). On price, update cadence, ads and in-app purchases 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.
Geosensors holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: HydroData has 5 ratings behind it against 1, so its average is the more settled of the two.
Geosensors ships an update every 3 weeks, HydroData monthly. The most recent releases landed on September 29, 2026 and October 2, 2026 respectively.
| Parameter | Geosensors | HydroData |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 2.6 (5 ratings) |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.3 — better | 17.6 |
| Further details — not scored | ||
| Size | 19 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Geosensors | Longitude 103 |
Customer experience
Geosensors
HydroData
In-app purchases
Geosensors
No in-app purchases
HydroData
No in-app purchases









