# LSI Water Service Logbook/Plan vs Pool Soft Admin

The clearest difference is in-app purchases: Pool Soft Admin at none against LSI Water Service Logbook/Plan's 2. Pool Soft Admin also leads on iOS requirement (15.6 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. LSI Water Service Logbook/Plan sells 2 in-app purchases, starting at $1.99 per month. Pool Soft Admin asks for nothing beyond the download.

LSI Water Service Logbook/Plan ships an update every 2 months, Pool Soft Admin monthly. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | LSI Water Service Logbook/Plan | Pool Soft Admin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lsi-water-service-logbookplan/id373769371/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Paid | — |
| Size | 6 MB | 46 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Verosocial Studio](https://appshunter.io/developer/354566841) | [SUBCOMM MANAGEMENT OOD](https://appshunter.io/developer/1608680226) |

## What reviewers say

### LSI Water Service Logbook/Plan

[App page](https://appshunter.io/ios/app/lsi-water-service-logbookplan/id373769371)

Easily calculate and track the Langelier Saturation Index for your pool water. Maintain optimal water balance for a healthy and safe swimming environment. Supports multiple units and saves your calculations over time.

**Highlights:** LSI Calculation, Water Chemistry Tracking, Email Calculations, CSV Export, Offline Use, Universal App Support

**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 |


### Pool Soft Admin

[App page](https://appshunter.io/ios/app/pool-soft-admin/id1611956295)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LSI Water Service Logbook/Plan free?

LSI Water Service Logbook/Plan is free to download, with in-app purchases available.

### Is Pool Soft Admin free?

Pool Soft Admin is free to download, with no in-app purchases.

### Do LSI Water Service Logbook/Plan or Pool Soft Admin have ads?

Neither LSI Water Service Logbook/Plan nor Pool Soft Admin shows ads.

### Which is updated more often, LSI Water Service Logbook/Plan or Pool Soft Admin?

LSI Water Service Logbook/Plan ships an update every 2 months, and Pool Soft Admin monthly. Most recently, LSI Water Service Logbook/Plan was updated on September 18, 2026 and Pool Soft Admin on September 12, 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.*