# Pool Log vs Pool Chemistry

The clearest difference is device support: Pool Log at 3 against Pool Chemistry's 1. Pool Chemistry's advantage is iOS requirement (18 vs 26.0). On price, update cadence, ads and in-app purchases 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 Chemistry sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Pool Log ships an update every 4 weeks, Pool Chemistry every 6 weeks. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Pool Log | Pool Chemistry |
| --- | --- | --- |
| 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 6 weeks |
| Monetization | Free | — |
| Size | 14 MB | 9 MB |
| Requires iOS | 26.0 | **18** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Michael Holloway](https://appshunter.io/developer/877302832) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## 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 Chemistry

[App page](https://appshunter.io/ios/app/pool-chemistry-chlor/id6759573566)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chlor Pro Monthly | $4.99 | per month |
| Chlor Pro Yearly | $39.99 | per year |
| Chlor Pro Yearly Promo | $39.99 | per year |


## Frequently asked questions

### Is Pool Log free?

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

### Is Pool Chemistry free?

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

### Do Pool Log or Pool Chemistry have ads?

Neither Pool Log nor Pool Chemistry shows ads.

### Which is updated more often, Pool Log or Pool Chemistry?

Pool Log ships an update every 4 weeks, and Pool Chemistry every 6 weeks. Most recently, Pool Log was updated on October 24, 2026 and Pool Chemistry on October 20, 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.*