# Flume Water vs Sutro

The clearest difference is rating: Flume Water at 4.7 against Sutro's 3.9. Flume Water also leads on ratings volume (1.7K vs 175). Sutro's advantage is in-app purchases (none vs 2) and review sentiment (73% vs 59%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Flume Water sells 2 in-app purchases, starting at $49.99 per year. Sutro asks for nothing beyond the download.

Flume Water holds the better App Store score, 4.7 against 3.9. That said, the two scores are not equally well evidenced: Flume Water has 1.7K ratings behind it against 175, so its average is the more settled of the two. Written reviews complicate that: 59% of Flume Water's written reviews are positive against 73% of Sutro's, so the app with the better star average is not the one people write more warmly about.

Flume Water ships an update every 6 weeks, Sutro every 2 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Flume Water | Sutro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.7K ratings)](https://appshunter.io/ios/app/flume-water/id1117135447/reviews)** | [3.9 (175 ratings)](https://appshunter.io/ios/app/sutro/id1439627399/reviews) |
| Number of ratings | **1.7K** | 175 |
| Positive reviews | 58.6% of reviews | **72.9% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 56 MB | 39 MB |
| Requires iOS | 15.0 | **12.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flume, Inc.](https://appshunter.io/developer/1117135446) | [Sutro Connect Inc](https://appshunter.io/developer/1439627398) |

## What reviewers say

### Flume Water

[App page](https://appshunter.io/ios/app/flume-water/id1117135447)

Monitor and manage your home's water usage with real-time data and leak detection. This app helps you understand your consumption, set budgets, and receive alerts to prevent costly water damage.

**Highlights:** Real-time water usage data, Leak detection and alerts, Water consumption budgeting, Household water use analysis, Easy self-installation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flume Insight | $49.99 | per year |
| Flume Insight | $49.99 | one-time |

**What reviewers like**

- 🚀 Easy installation and setup
- 🔒 Accurate water usage monitoring
- 👍 Helpful for detecting leaks
- 👍 Detailed water usage data and insights
- 👍 Responsive customer support

**What reviewers complain about**

- 🐛 Connectivity issues and unreliable notifications
- 🔋 Short battery life and expensive replacement
- 👎 Clunky and unintuitive app interface
- 🔒 Privacy concerns with data collection
- 👎 Recurring issues after firmware updates

**Reported bugs**

- App freezes and crashes
- Inaccurate water usage reporting
- Calibration issues after battery replacement
- Delayed or missed leak notifications

**Requested features**

- Landscape mode support for tablets
- Integration with smart home platforms
- Customizable notification settings
- Ability to manually train the system
- Enhanced data export and analysis tools


### 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 Flume Water free?

Flume Water is free to download, with in-app purchases available.

### Is Sutro free?

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

### Which has better reviews, Flume Water or Sutro?

Flume Water is rated higher. Flume Water averages 4.7 out of 5 from 1.7K ratings, while Sutro averages 3.9 from 175 ratings.

### Do Flume Water or Sutro have ads?

Neither Flume Water nor Sutro shows ads.

### Which is updated more often, Flume Water or Sutro?

Flume Water ships an update every 6 weeks, and Sutro every 2 months. Most recently, Flume Water was updated on November 6, 2026 and Sutro on November 2, 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.*