# HydroData vs whatwatt

The clearest difference is rating: whatwatt at 5.0 against HydroData's 2.6. HydroData's advantage is ratings volume (5 vs 1). On price, update cadence, 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.

whatwatt 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.

HydroData ships an update monthly, whatwatt every 2 weeks. The most recent releases landed on August 5, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | HydroData | whatwatt |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (5 ratings)](https://appshunter.io/ios/app/hydrodata/id1576887037/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/whatwatt/id6740263482/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 50 MB | 53 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Longitude 103](https://appshunter.io/developer/1576887039) | [whatwatt AG](https://appshunter.io/developer/1789292734) |

## 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


### whatwatt

[App page](https://appshunter.io/ios/app/whatwatt/id6740263482)

This utility app is preparing for future enhancements. Developers are working on new functionalities that will be revealed soon.

**Highlights:** Future feature groundwork, Upcoming enhancements, Developer updates

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HydroData free?

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

### Is whatwatt free?

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

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

whatwatt is rated higher. HydroData averages 2.6 out of 5 from 5 ratings, while whatwatt averages 5.0 from 1 ratings.

### Do HydroData or whatwatt have ads?

Neither HydroData nor whatwatt shows ads.

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

HydroData ships an update monthly, and whatwatt every 2 weeks. Most recently, HydroData was updated on August 5, 2026 and whatwatt on September 16, 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.*