# LSI Pool and Spa Calculator vs PoolCalc

The clearest difference is review sentiment: LSI Pool and Spa Calculator at 79% against PoolCalc's 17%. LSI Pool and Spa Calculator also leads on rating (5.0 vs 1.0) and update cadence (every 5 weeks vs every 2 months). PoolCalc's advantage is iOS requirement (7.1 vs 17.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. LSI Pool and Spa Calculator sells 2 in-app purchases, starting at $1.99 per month and PoolCalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

LSI Pool and Spa Calculator holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 79% of LSI Pool and Spa Calculator's written reviews are positive against 17% of PoolCalc's.

LSI Pool and Spa Calculator ships an update every 5 weeks, PoolCalc every 2 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | LSI Pool and Spa Calculator | PoolCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lsi-pool-and-spa-calculator/id373769371/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/poolcalc/id514707093/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **78.6% of reviews** | 16.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 8 MB | 8 MB |
| Requires iOS | 17.6 | **7.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Verosocial Studio](https://appshunter.io/developer/354566841) | [Bonham Customs](https://appshunter.io/developer/514707096) |

## What reviewers say

### LSI Pool and Spa Calculator

[App page](https://appshunter.io/ios/app/lsi-pool-and-spa-calculator/id373769371)

This app helps pool and spa professionals organize water testing readings, customer details, and service visits. It calculates the Langelier Saturation Index, tracks historical data, and generates service reports for clients.

**Highlights:** Calculate LSI from water parameters, Track customer and site details, Log service visits and chemical actions, View historical data and charts, Generate service reports, Schedule future visits

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LSI Calculators pro Monthly | $1.99 | per month |
| LSI Calculators pro lifetime | $14.99 | one-time |


### PoolCalc

[App page](https://appshunter.io/ios/app/poolcalc/id514707093)

This utility calculates the scaling potential of pool water using the Langelier Saturation Index. It allows users to save and edit readings, locations, and add notes. A paid upgrade offers advanced features for pool professionals.

**Highlights:** Langelier Saturation Index calculation, Save and edit readings, Save and edit locations, Add notes to readings, Quick add readings to locations, Paid upgrade for multiple location routes

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pool Professional Upgrade | $2.99 | one-time |


## Frequently asked questions

### Is LSI Pool and Spa Calculator free?

LSI Pool and Spa Calculator is free to download, with in-app purchases available.

### Is PoolCalc free?

PoolCalc is free to download, with in-app purchases available.

### Which has better reviews, LSI Pool and Spa Calculator or PoolCalc?

LSI Pool and Spa Calculator is rated higher. LSI Pool and Spa Calculator averages 5.0 out of 5 from 1 ratings, while PoolCalc averages 1.0 from 1 ratings.

### Do LSI Pool and Spa Calculator or PoolCalc have ads?

Neither LSI Pool and Spa Calculator nor PoolCalc shows ads.

### Which is updated more often, LSI Pool and Spa Calculator or PoolCalc?

LSI Pool and Spa Calculator ships an update every 5 weeks, and PoolCalc every 2 months. Most recently, LSI Pool and Spa Calculator was updated on November 6, 2026 and PoolCalc on November 6, 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.*