# WaterQuality vs Calibrate Training App

The clearest difference is price: Calibrate Training App at Free against WaterQuality's $4.99. Calibrate Training App also leads on update cadence (fortnightly vs every 5 months). WaterQuality's advantage is in-app purchases (none vs 6) and chart position (#197 vs unranked). On ads and device support there is nothing between them.

Calibrate Training App is free to download; WaterQuality costs $4.99 up front. Calibrate Training App sells 6 one-off in-app purchases. WaterQuality asks for nothing beyond the download.

WaterQuality ships an update every 5 months, Calibrate Training App fortnightly. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | WaterQuality | Calibrate Training App |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/waterquality/id569193509/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | Paid | — |
| Best chart rank | **#197** | — |
| Size | 96 MB | 44 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Stroud Water Research Center](https://appshunter.io/developer/1200990268) | [Harry Simington](https://appshunter.io/developer/1763907787) |

## What reviewers say

### WaterQuality

[App page](https://appshunter.io/ios/app/waterquality/id569193509)

**Currently charting:** #197 Top Paid · Education (US App Store)

This educational app allows users of all ages to record stream study data and learn about water quality indicators. It functions offline and includes a field guide for identifying aquatic macroinvertebrates to assess pollution tolerance. Data can be exported for scientific research or educational purposes.

**Highlights:** Record stream study data, Learn about water quality indicators, Offline functionality, Macroinvertebrate field guide, Data export (print/email), Site location recording

**Features:** Vision Pro support

**In-app purchases:** none


### Calibrate Training App

[App page](https://appshunter.io/ios/app/calibrate-training-app/id6636496706)

**Features:** Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Shoulder Stability Program | $29.00 | one-time |
| Advanced Baseball Pitching | $59.00 | one-time |
| Calibrate Your Golf Swing | $59.99 | one-time |
| Golf Stability Program | $59.99 | one-time |
| Baseball Pitching Program | $59.99 | one-time |
| All Programs | $99.00 | one-time |


## Frequently asked questions

### Is WaterQuality free?

WaterQuality costs $4.99, with no in-app purchases.

### Is Calibrate Training App free?

Calibrate Training App is free to download, with in-app purchases available.

### Do WaterQuality or Calibrate Training App have ads?

Neither WaterQuality nor Calibrate Training App shows ads.

### Which is updated more often, WaterQuality or Calibrate Training App?

WaterQuality ships an update every 5 months, and Calibrate Training App fortnightly. Most recently, WaterQuality was updated on November 1, 2026 and Calibrate Training App on October 25, 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.*