# Flume Water vs Sub

The clearest difference is review sentiment: Flume Water at 59% against Sub's 15%. Flume Water also leads on rating (4.7 vs 4.4). Sub's advantage is in-app purchases (none vs 2). On price, ratings volume, update cadence and ads there is nothing between them.

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

Flume Water holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 1.7K and 790 respectively. Written reviews point the same way: 59% of Flume Water's written reviews are positive against 15% of Sub's.

Flume Water ships an update every 6 weeks, Sub every 5 weeks. Both last shipped on November 11, 2026.

## The numbers

| Metric | Flume Water | Sub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.7K ratings)](https://appshunter.io/ios/app/flume-water/id1117135447/reviews)** | [4.4 (790 ratings)](https://appshunter.io/ios/app/sub-zero-group-owners-app/id1248991284/reviews) |
| Number of ratings | **1.7K** | 790 |
| Positive reviews | **58.6% of reviews** | 14.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 56 MB | 69 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flume, Inc.](https://appshunter.io/developer/1117135446) | [Sub-Zero and Wolf](https://appshunter.io/developer/983988992) |

## 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


### Sub

[App page](https://appshunter.io/ios/app/sub-zero-group-owners-app/id1248991284)

This app enhances your kitchen experience by guiding you through recipes from websites and a curated collection. It allows remote control and monitoring of Sub-Zero refrigeration, Cove dishwashing, and Wolf appliances, ensuring optimal performance and convenience.

**Highlights:** Guided cooking from online recipes, Chef-tested recipes optimized for Wolf appliances, Remote dishwasher control and monitoring, Refrigerator settings and alerts, Filter recipes by cooking mode, Bookmark and share recipes

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Responsive and intuitive app
- 👍 Helpful notifications and alerts
- 🔒 Secure connection to appliances

**What reviewers complain about**

- 🐛 Frequent connection issues and disconnects
- 🔍 Lack of actual temperature monitoring
- 🤔 Confusing setup and pairing process
- 🔍 Missing key features like remote start

**Reported bugs**

- App crashes after recent updates
- Unable to log in or register account
- Appliances disappear from the app
- Firmware update failures brick appliances

**Requested features**

- Add support for Celsius temperature units
- Provide real-time temperature and energy consumption data
- Integrate with smart home platforms like Apple HomeKit


## Frequently asked questions

### Is Flume Water free?

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

### Is Sub free?

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

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

Flume Water is rated higher. Flume Water averages 4.7 out of 5 from 1.7K ratings, while Sub averages 4.4 from 790 ratings.

### Do Flume Water or Sub have ads?

Neither Flume Water nor Sub shows ads.

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

Flume Water ships an update every 6 weeks, and Sub every 5 weeks. Most recently, Flume Water was updated on November 11, 2026 and Sub on November 11, 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.*