# iopool vs Sutro

The clearest difference is review sentiment: iopool at 60% against Sutro's 0%. iopool also leads on rating (4.3 vs 3.2) and update cadence (every 2 weeks vs every 8 months). Sutro's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, 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 3.2. That said, the two scores are not equally well evidenced: iopool has 94 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 60% of iopool's written reviews are positive against 0% of Sutro's.

iopool ships an update every 2 weeks, Sutro every 8 months. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | iopool | Sutro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (94 ratings)](https://appshunter.io/ios/app/iopool/id1449698927/reviews)** | [3.2 (11 ratings)](https://appshunter.io/ios/app/sutro-pro/id1552389685/reviews) |
| Number of ratings | **94** | 11 |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 8 months |
| Monetization | Ad-supported | **Free** |
| Size | 78 MB | 65 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Iopool](https://appshunter.io/developer/1449698926) | [Sutro Connect Inc](https://appshunter.io/developer/1439627398) |

## What reviewers say

### 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


### Sutro

[App page](https://appshunter.io/ios/app/sutro-pro/id1552389685)

This app connects multiple pool and spa monitoring devices to a single interface. It allows users to manage and view the status of all their connected Sutro devices from one convenient location.

**Highlights:** Connect multiple Sutro devices, Centralized device management, View device status, Route management for devices

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iopool free?

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

### Is Sutro free?

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

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

iopool is rated higher. iopool averages 4.3 out of 5 from 94 ratings, while Sutro averages 3.2 from 11 ratings.

### Do iopool or Sutro have ads?

iopool shows ads; Sutro does not.

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

iopool ships an update every 2 weeks, and Sutro every 8 months. Most recently, iopool was updated on October 7, 2026 and Sutro on October 6, 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.*