WaterGuru vs Sutro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WaterGuru
This app provides comprehensive control over your pool's water chemistry. It helps maintain a safe environment by keeping out harmful contaminants and offers lab-grade analysis and treatment advice for simplified pool management.
- Pool water chemistry control
- Harmful virus and bacteria prevention
- Lab-grade analysis
- Water treatment advice
- Simplified pool management
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Get ultimate control over your pool water chemistry with WaterGuru. Keep harmful viruses and bacteria out and simplify how you manage your pool forever. Rebuilt from the ground up, the next generation app includes all features you love and more, including lab grade analysis and water treatment advice.
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.
Screenshots
Verdict
The clearest difference is rating: WaterGuru at 4.1 against Sutro's 3.9. WaterGuru also leads on update cadence (every 4 weeks vs every 2 months). Sutro's advantage is iOS requirement (12.4 vs 15.0). On price, review sentiment, ratings volume and ads 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.
WaterGuru holds the better App Store score, 4.1 against 3.9. Both are backed by a comparable volume of ratings — 239 and 175 respectively. Written reviews split almost evenly too, at 74% and 73% positive.
WaterGuru ships an update every 4 weeks, Sutro every 2 months. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.
| Parameter | WaterGuru | Sutro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (239 ratings) — better | 3.9 (175 ratings) |
| Positive reviews | 73.8% of reviews — better | 72.9% of reviews |
| Number of ratings | 239 — better | 175 |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 15.0 | 12.4 — better |
| Further details — not scored | ||
| Size | 155 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | WaterGuru, Inc | Sutro Connect Inc |
Customer experience
WaterGuru
Sutro
User reviews
WaterGuru
From 239 App Store ratingsWhat we love
- 💰 Money saver
- 🔍 Accurate readings
- 🕰️ Convenient daily monitoring
- 👨💻 Excellent customer service
- 🔧 Easy to use
Room to improve
- 🐛 Connectivity issues
- 🔋 Battery drain
- 🤖 Inaccurate readings for some parameters
- 💸 Expensive cartridges
- 🤷♂️ Unreliable device
Sutro
From 175 App Store ratingsWhat we love
- 🚀 Easy to use
- 👍 Accurate water testing
- 💡 Helpful notifications and recommendations
- 🔒 Reliable customer support
- 🚀 Convenient pool monitoring
Room to improve
- 🐛 Connectivity issues
- 🐛 Inaccurate readings
- 🐛 Buggy app performance
- 🔋 Expensive subscription
- 🐛 Setup difficulties
Bugs and requests
WaterGuru
Reported bugs
3 issues- App notifications not working properly
- Inability to upload pool photos
- Inconsistent app performance after updates
Requested features
4 requests- Ability to set custom testing schedule
- Measure salt levels
- Provide more advice on adjusting water chemistry
- Add hourly temperature readings
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
In-app purchases
WaterGuru
No in-app purchases
Sutro
No in-app purchases
