HydraGO vs Emlid Flow
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.
Emlid Flow
Manage Emlid Reach receivers and perform positioning tasks like data collection and mapping. Offers free and pro plans for various survey workflows, with cloud sync and team collaboration features.
- Receiver management (base/rover setup)
- RTK/PPK configuration
- Point collection and stakeout
- Import/export various file formats
- Coordinate system library
- Cloud sync with Emlid Flow 360
- Team collaboration
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Emlid Flow is a companion app for Emlid Reach receivers, designed to manage devices and handle all your positioning tasks in one place. The app has Free and Pro plans for a wide range of applications, from ground control point collection to topographic mapping and earthworks. What you get with the free version: - Full control of your receivers: set up base and rover, update, configure RTK and PPK. - Point collection and stakeout. - Import/Export CSV, DXF, KML, or Shapefile files. - Built-in coordinate system library with over 1000 systems. - Ability to create custom coordinate systems. - Base shift. - Cloud sync with Emlid Flow 360. - Team collaboration with up to 10 members. Emlid Flow 360 is the web platform where you can access all data from the app and vice versa! Sync works instantly, allowing you to prepare, manage, and export projects in the office without manual file transfers and even with the receiver at hand. For more advanced survey workflows, Emlid Flow offers Pro Plan: - Collect and stakeout lines and polygons. - Stakeout reports and collect rules for accuracy control. - Survey codes to better differentiate data. - DTM support. - Auto collection tool to free your hands. - Inverse & Traverse for geometry calculations. - Team collaboration with an unlimited number of members. And much more with continuous updates! Try Pro Plan with a 30-day trial available on all platforms. Terms of use: https://emlid.com/legal/#apps-terms Privacy Policy: https://emlid.com/legal/#privacy
Screenshots
Verdict
The clearest difference is in-app purchases: HydraGO at none against Emlid Flow's 1. HydraGO also leads on iOS requirement (9.0 vs 16.0). Emlid Flow's advantage is update cadence (every 10 days vs every 24 months). On price, ads 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. Emlid Flow sells 1 in-app purchase, starting at $24.99 per month. HydraGO asks for nothing beyond the download.
HydraGO ships an update every 24 months, Emlid Flow every 10 days. The most recent releases landed on October 17, 2026 and October 25, 2026 respectively.
| Parameter | HydraGO | Emlid Flow |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.9 (36 ratings) — better |
| Positive reviews | — | 55.0% of reviews |
| Number of ratings | — | 36 — better |
| Update frequency | Every 24 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 5 MB | 205 MB |
| Age rating | 4+ | 4+ |
| Developer | Stevens Water Monitoring Systems, Inc. | Emlid Tech Kft. |
In-app purchases
HydraGO
No in-app purchases
Emlid Flow
- Pro Plan Individual Monthly1 Month trial$24.991 Month
