# LSI Pool and Spa Calculator vs PoolBuddy

The clearest difference is in-app purchases: PoolBuddy at none against LSI Pool and Spa Calculator's 2. PoolBuddy also leads on update cadence (every 4 days vs every 6 weeks). On price, ads, device support and iOS requirement 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. PoolBuddy asks for nothing beyond the download.

LSI Pool and Spa Calculator ships an update every 6 weeks, PoolBuddy every 4 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | LSI Pool and Spa Calculator | PoolBuddy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lsi-pool-and-spa-calculator/id373769371/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 3 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | +4 | 4+ |
| Developer | [Verosocial Studio](https://appshunter.io/developer/354566841) | [Netknow](https://appshunter.io/developer/398337114) |

## 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 meticulously track water chemistry, customer details, and service records. It calculates the Langelier Saturation Index, logs visits with notes, and organizes customer and property information. Visualize trends with charts and generate reports for comprehensive service management.

**Highlights:** Calculate LSI with detailed water chemistry inputs, Log service visits with notes and treatments, Organize customer and property contact information, Map saved pool and spa locations, Review historical water chemistry data with charts, Quick calculation without saving readings, Generate PDF reports and export data as CSV

**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 |


### PoolBuddy

[App page](https://appshunter.io/ios/app/poolbuddy-pool-assistant/id6786665207)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## 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 PoolBuddy free?

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

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

Neither LSI Pool and Spa Calculator nor PoolBuddy shows ads.

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

LSI Pool and Spa Calculator ships an update every 6 weeks, and PoolBuddy every 4 days. Most recently, LSI Pool and Spa Calculator was updated on November 1, 2026 and PoolBuddy on October 31, 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.*