# Simple Pool vs Unwind

The clearest difference is in-app purchases: Unwind at none against Simple Pool's 1. Simple Pool's advantage is update cadence (every 6 days vs every 2 months) and ratings volume (21 vs 3). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Simple Pool sells 1 one-off in-app purchase. Unwind asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Simple Pool against 5.0 for Unwind. That said, the two scores are not equally well evidenced: Simple Pool has 21 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Simple Pool ships an update every 6 days, Unwind every 2 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | Simple Pool | Unwind |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (21 ratings)](https://appshunter.io/ios/app/simple-pool-chemistry-and-math/id6744664712/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/unwind-dog-behavior-tracker/id6755273686/reviews)** |
| Number of ratings | **21** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 29 MB | 26 MB |
| Requires iOS | **17.6** | 26.1 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Grey Park, LLC](https://appshunter.io/developer/1739831354) | [Identity Mad LLC](https://appshunter.io/developer/1852899164) |

## What reviewers say

### Simple Pool

[App page](https://appshunter.io/ios/app/simple-pool-chemistry-and-math/id6744664712)

This app helps you precisely test, dose, and track your pool and spa water chemistry. It offers practical dosing recommendations and tools to simplify routine maintenance for various pool types. Get accurate chemical calculations without ongoing fees.

**Highlights:** Water test logging, Dosing recommendations, Chemical tracking, LSI/CSI monitoring, Shock treatment mode, Test reminders, Chemical effects preview

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SimplePool - Lifetime | $9.99 | one-time |


### Unwind

[App page](https://appshunter.io/ios/app/unwind-dog-behavior-tracker/id6755273686)

Track your dog's walks, incidents, and enrichment activities to identify behavioral patterns. Gain insights into what's contributing to your dog's stress or anxiety, allowing you to intervene before issues escalate. Features household sharing and Apple Watch integration.

**Highlights:** Track walks with GPS routes and types, Log encounters and dog reactions, Record incidents with triggers and severity, Monitor enrichment and care activities, View weekly summaries and behavioral patterns, Household sharing and multi-dog support, Apple Watch companion app

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Simple Pool free?

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

### Is Unwind free?

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

### Which has better reviews, Simple Pool or Unwind?

Unwind is rated higher. Simple Pool averages 5.0 out of 5 from 21 ratings, while Unwind averages 5.0 from 3 ratings.

### Do Simple Pool or Unwind have ads?

Neither Simple Pool nor Unwind shows ads.

### Which is updated more often, Simple Pool or Unwind?

Simple Pool ships an update every 6 days, and Unwind every 2 months. Most recently, Simple Pool was updated on October 30, 2026 and Unwind on October 30, 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.*