Sutro vs iopool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sutro
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.
- Automatic water quality monitoring
- pH tracking
- Free chlorine measurement
- Alkalinity tracking
- Temperature monitoring
- Seamless app integration
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Sutro is the simple, safe, and seamless way to manage your Pool (or Spa) water with measurements that make sense and monitoring that is automatic. The Sutro app works with the Sutro Smart Monitor to measure your pool or spa’s pH, free chlorine (ppm), alkalinity, and temperature without you having to do anything.
iopool
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.
- Continuous water analysis
- Automated product addition notifications
- Step-by-step treatment guidance
- Intelligent maintenance recommendations
- Product inventory and quantity management
- Pool health monitoring
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The iopool application allows pool owners to manage their water treatment themselves. The EcO probe analyzes the water continuously and the application displays the results of the analyses. When an addition of products is necessary, the user is notified. The application explains step by step the steps to follow for optimal efficiency and safety. Thanks to iopool's intelligent recommendation engine and its application, users no longer need to worry about managing inventory and quantity of maintenance products. These products have been selected by iopool for their efficiency, in partnership with a university research center. The iopool application is the best companion for users of a private pool. The application makes it possible to know at any time the state of health of the pool, forgetting the chore of weekly strips.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sutro | iopool |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (175 ratings) | 4.3 (94 ratings) — better |
| Positive reviews | 72.9% of reviews — better | 60.0% of reviews |
| Number of ratings | 175 — better | 94 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.4 — better | 15.1 |
| Further details — not scored | ||
| Size | 39 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | Sutro Connect Inc | Iopool |
Customer experience
Sutro
iopool
Bugs and requests
Sutro
Reported bugs
4 issues- App crashes and freezes
- Disconnection issues with hub
- Calibration failures
- Inaccurate water chemistry readings
Requested features
4 requests- Measure total hardness and CYA
- Customizable notification settings
- Ability to cancel subscription easily
- Improved app stability and user experience
iopool
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Sutro
No in-app purchases
iopool
No in-app purchases
