# HydroData vs GaugeWatcher

The clearest difference is rating: GaugeWatcher at 5.0 against HydroData's 2.6. GaugeWatcher also leads on update cadence (weekly vs monthly). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GaugeWatcher holds the better App Store score, 5.0 against 2.6. Both are backed by a comparable volume of ratings — 5 and 3 respectively.

HydroData ships an update monthly, GaugeWatcher weekly. The most recent releases landed on August 5, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | HydroData | GaugeWatcher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (5 ratings)](https://appshunter.io/ios/app/hydrodata/id1576887037/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/gaugewatcher/id6498313776/reviews)** |
| Number of ratings | **5** | 3 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | Free |
| Size | 50 MB | 37 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Longitude 103](https://appshunter.io/developer/1576887039) | [Andrew Althage](https://appshunter.io/developer/1631629264) |

## What reviewers say

### HydroData

[App page](https://appshunter.io/ios/app/hydrodata/id1576887037)

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.

**Highlights:** Field data collection, Map-based feature selection, Location tracking, Cloud synchronization, Well water level logging, Dam inspection reports

**Features:** Vision Pro support

**In-app purchases:** none


### GaugeWatcher

[App page](https://appshunter.io/ios/app/gaugewatcher/id6498313776)

Access real-time river flow data without needing an account or encountering advertisements. Discover nearby gauges, monitor flow rates, and save your preferred locations for quick access.

**Highlights:** Real-time river flow data, Discover nearby gauges, Check flow rates, Bookmark favorite gauges, No signup required, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HydroData free?

HydroData is free to download, with no in-app purchases.

### Is GaugeWatcher free?

GaugeWatcher is free to download, with no in-app purchases.

### Which has better reviews, HydroData or GaugeWatcher?

GaugeWatcher is rated higher. HydroData averages 2.6 out of 5 from 5 ratings, while GaugeWatcher averages 5.0 from 3 ratings.

### Do HydroData or GaugeWatcher have ads?

Neither HydroData nor GaugeWatcher shows ads.

### Which is updated more often, HydroData or GaugeWatcher?

HydroData ships an update monthly, and GaugeWatcher weekly. Most recently, HydroData was updated on August 5, 2026 and GaugeWatcher on September 1, 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.*