# Sutro vs iopool

The clearest difference is ads: Sutro at none against iopool's shown. Sutro also leads on review sentiment (73% vs 60%) and monetization model (free vs ad-supported). iopool's advantage is rating (4.3 vs 3.9) and update cadence (every 2 weeks vs every 2 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iopool holds the better App Store score, 4.3 against 3.9. Both are backed by a comparable volume of ratings — 175 and 94 respectively. Written reviews complicate that: 73% of Sutro's written reviews are positive against 60% of iopool's, so the app with the better star average is not the one people write more warmly about.

Sutro ships an update every 2 months, iopool every 2 weeks. The most recent releases landed on June 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Sutro | iopool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (175 ratings)](https://appshunter.io/ios/app/sutro/id1439627399/reviews) | **[4.3 (94 ratings)](https://appshunter.io/ios/app/iopool/id1449698927/reviews)** |
| Number of ratings | **175** | 94 |
| Positive reviews | **72.9% of reviews** | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 39 MB | 78 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sutro Connect Inc](https://appshunter.io/developer/1439627398) | [Iopool](https://appshunter.io/developer/1449698926) |

## What reviewers say

### Sutro

[App page](https://appshunter.io/ios/app/sutro/id1439627399)

Effortlessly manage your pool or spa water quality. This app works with a smart monitor to automatically track pH, free chlorine, alkalinity, and temperature, providing insights that make sense for optimal water conditions.

**Highlights:** Automatic water quality monitoring, pH tracking, Free chlorine measurement, Alkalinity tracking, Temperature monitoring, Seamless app integration

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 👍 Accurate water testing
- 💡 Helpful notifications and recommendations
- 🔒 Reliable customer support
- 🚀 Convenient pool monitoring

**What reviewers complain about**

- 🐛 Connectivity issues
- 🐛 Inaccurate readings
- 🐛 Buggy app performance
- 🔋 Expensive subscription
- 🐛 Setup difficulties

**Reported bugs**

- App crashes and freezes
- Disconnection issues with hub
- Calibration failures
- Inaccurate water chemistry readings

**Requested features**

- Measure total hardness and CYA
- Customizable notification settings
- Ability to cancel subscription easily
- Improved app stability and user experience


### iopool

[App page](https://appshunter.io/ios/app/iopool/id1449698927)

This app helps pool owners manage their water treatment with continuous analysis from a smart probe. It provides step-by-step guidance for product additions and intelligent recommendations for maintenance, eliminating the need for manual inventory checks.

**Highlights:** Continuous water analysis, Automated product addition notifications, Step-by-step treatment guidance, Intelligent maintenance recommendations, Product inventory and quantity management, Pool health monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sutro free?

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

### Is iopool free?

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

### Which has better reviews, Sutro or iopool?

iopool is rated higher. Sutro averages 3.9 out of 5 from 175 ratings, while iopool averages 4.3 from 94 ratings.

### Do Sutro or iopool have ads?

iopool shows ads; Sutro does not.

### Which is updated more often, Sutro or iopool?

Sutro ships an update every 2 months, and iopool every 2 weeks. Most recently, Sutro was updated on June 10, 2026 and iopool on September 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.*