# Pool Log vs Pool Chemical LogBook

The clearest difference is update cadence: Pool Chemical LogBook at every 8 days against Pool Log's every 4 weeks. Pool Chemical LogBook also leads on iOS requirement (18.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Pool Log sells 2 in-app purchases, starting at $0.99 per month and Pool Chemical LogBook sells 10 in-app purchases, starting at $11.99 per month. Whichever you choose, the download price is not the number that matters.

Pool Log ships an update every 4 weeks, Pool Chemical LogBook every 8 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Pool Log | Pool Chemical LogBook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8 ratings)](https://appshunter.io/ios/app/pool-log/id6744295287/reviews)** | — |
| Number of ratings | **8** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 8 days** |
| Monetization | Free | — |
| Size | 14 MB | 27 MB |
| Requires iOS | 26.0 | **18.6** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Michael Holloway](https://appshunter.io/developer/877302832) | [POOL BY ENGINEER INC](https://appshunter.io/developer/1843551094) |

## What reviewers say

### Pool Log

[App page](https://appshunter.io/ios/app/pool-log/id6744295287)

This app provides precise chemical dosing instructions for pools and spas based on your test results. It tracks multiple water bodies, integrates local weather data, and offers advanced features like SLAM mode for algae and CSI calculations. All data is stored locally for privacy.

**Highlights:** Precise chemical dosing instructions, Manages multiple pools and spas, Weather-aware test result tracking, SLAM mode for algae treatment, Calcite Saturation Index (CSI) calculation, Chemical addition logging, Maintenance task tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $0.99 | per month |
| Annual Plan | $7.99 | per year |


### Pool Chemical LogBook

[App page](https://appshunter.io/ios/app/pool-chemical-logbook/id6753330664)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $11.99 | per month |
| 2 Seat Monthly Plan | $23.99 | per month |
| 3 Seat Monthly Plan | $35.99 | per month |
| 4 Seat Monthly Plan | $47.99 | per month |
| 5 Seat Monthly Plan | $59.99 | per month |
| 6 Seat Monthly Plan | $69.99 | per month |
| 7 Seat Monthly Plan | $84.99 | per month |
| 8 Seat Monthly Plan | $94.99 | per month |
| 9 Seat Monthly Plan | $109.99 | per month |
| 10 Seat Monthly Plan | $119.99 | per month |


## Frequently asked questions

### Is Pool Log free?

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

### Is Pool Chemical LogBook free?

Pool Chemical LogBook is free to download, with in-app purchases available.

### Do Pool Log or Pool Chemical LogBook have ads?

Neither Pool Log nor Pool Chemical LogBook shows ads.

### Which is updated more often, Pool Log or Pool Chemical LogBook?

Pool Log ships an update every 4 weeks, and Pool Chemical LogBook every 8 days. Most recently, Pool Log was updated on October 24, 2026 and Pool Chemical LogBook on October 24, 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.*