# ICO vs Sutro

ICO and Sutro both sit at 3.9 stars, but that hides the real split: 73% of Sutro's written reviews are positive against 46% of ICO's. Sutro also leads on ratings volume (175 vs 38) and iOS requirement (12.4 vs 14.0). On price, rating, update cadence and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 3.9 for ICO against 3.9 for Sutro. Both are backed by a comparable volume of ratings — 38 and 175 respectively. Written reviews are what separate them: 46% of ICO's written reviews are positive against 73% of Sutro's.

ICO ships an update every 5 weeks, Sutro every 2 months. The most recent releases landed on September 26, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | ICO | Sutro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (38 ratings)](https://appshunter.io/ios/app/ico-smart-poolspa-partner/id1132611479/reviews)** | [3.9 (175 ratings)](https://appshunter.io/ios/app/sutro/id1439627399/reviews) |
| Number of ratings | 38 | **175** |
| Positive reviews | 45.9% of reviews | **72.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 78 MB | 39 MB |
| Requires iOS | 14.0 | **12.4** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ONDILO](https://appshunter.io/developer/1132611478) | [Sutro Connect Inc](https://appshunter.io/developer/1439627398) |

## What reviewers say

### ICO

[App page](https://appshunter.io/ios/app/ico-smart-poolspa-partner/id1132611479)

This application helps you maintain optimal water quality in your pool or spa. It provides personalized guidance for chemical dosing and best practices to ensure a healthier swimming experience and protect your equipment. Monitor your water quality conveniently from anywhere, anytime.

**Highlights:** Measures critical water parameters, Promotes healthier, cleaner water, Personalized chemical dosing guidance, Protects pool equipment, Provides best swimming experience, Accessible from anywhere, anytime

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is ICO free?

ICO 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, ICO or Sutro?

ICO is rated higher. ICO averages 3.9 out of 5 from 38 ratings, while Sutro averages 3.9 from 175 ratings.

### Do ICO or Sutro have ads?

Neither ICO nor Sutro shows ads.

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

ICO ships an update every 5 weeks, and Sutro every 2 months. Most recently, ICO was updated on September 26, 2026 and Sutro on June 10, 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.*