# Pool Water Calculator vs Vigorplus TPMS

The clearest difference is price: Vigorplus TPMS at Free against Pool Water Calculator's $4.99. Pool Water Calculator's advantage is update cadence (fortnightly vs every 9 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Vigorplus TPMS is free to download; Pool Water Calculator costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pool Water Calculator ships an update fortnightly, Vigorplus TPMS every 9 months. The most recent releases landed on September 24, 2026 and May 19, 2026 respectively.

## The numbers

| Metric | Pool Water Calculator | Vigorplus TPMS |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.6 (94 ratings)](https://appshunter.io/ios/app/pool-water-calculator/id1249919347/reviews)** | — |
| Number of ratings | **94** | — |
| Positive reviews | 76.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 9 months |
| Monetization | Free | — |
| Size | 30 MB | 39 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ingenio Productions LLC](https://appshunter.io/developer/1249919346) | [JET Opto](https://appshunter.io/developer/956415819) |

## What reviewers say

### Pool Water Calculator

[App page](https://appshunter.io/ios/app/pool-water-calculator/id1249919347)

This app helps you precisely balance and maintain your pool or spa water chemistry. It offers a chemistry calculator, pool volume measurement, and detailed data logging with visual trend analysis. Get tailored recommendations and manage multiple water profiles with ease.

**Highlights:** Chemistry calculator for precise chemical dosages, Pool volume calculator, Data logging for test results and additions, Visual trend graphs for water chemistry, Personalized chemical recommendations, Manage multiple pool/spa profiles, Broad chemical support

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

**In-app purchases:** none


### Vigorplus TPMS

[App page](https://appshunter.io/ios/app/vigorplus-tpms/id6466265085)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pool Water Calculator free?

Pool Water Calculator costs $4.99, with no in-app purchases.

### Is Vigorplus TPMS free?

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

### Do Pool Water Calculator or Vigorplus TPMS have ads?

Neither Pool Water Calculator nor Vigorplus TPMS shows ads.

### Which is updated more often, Pool Water Calculator or Vigorplus TPMS?

Pool Water Calculator ships an update fortnightly, and Vigorplus TPMS every 9 months. Most recently, Pool Water Calculator was updated on September 24, 2026 and Vigorplus TPMS on May 19, 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.*