# Symphony by GeoStar vs Sub

The clearest difference is rating: Sub at 4.4 against Symphony by GeoStar's 2.0. Sub also leads on ratings volume (786 vs 4) and update cadence (every 5 weeks vs every 4 months). Symphony by GeoStar's advantage is monetization model (free vs ad-supported). On price, ads, in-app purchases and device support there is nothing between them.

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

Sub holds the better App Store score, 4.4 against 2.0. That said, the two scores are not equally well evidenced: Sub has 786 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 0% of Symphony by GeoStar's written reviews are positive against 15% of Sub's.

Symphony by GeoStar ships an update every 4 months, Sub every 5 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Symphony by GeoStar | Sub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (4 ratings)](https://appshunter.io/ios/app/symphony-by-geostar/id1161399121/reviews) | **[4.4 (786 ratings)](https://appshunter.io/ios/app/sub-zero-group-owners-app/id1248991284/reviews)** |
| Number of ratings | 4 | **786** |
| Positive reviews | 0.0% of reviews | **14.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 17 MB | 69 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WaterFurnace International](https://appshunter.io/developer/940139733) | [Sub-Zero and Wolf](https://appshunter.io/developer/983988992) |

## What reviewers say

### Symphony by GeoStar

[App page](https://appshunter.io/ios/app/symphony-by-geostar/id1161399121)

Control and monitor your geothermal comfort system remotely. View real-time system feedback, track energy usage, and receive alerts for maintenance. Access your entire geothermal system, not just the thermostat, from any internet-connected device.

**Highlights:** Remote system monitoring, Real-time feedback, Temperature and program control, Energy usage tracking, Equipment alerts and reminders, Cloud-based access

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

**In-app purchases:** none


### 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 Symphony by GeoStar free?

Symphony by GeoStar is free to download, with no in-app purchases.

### Is Sub free?

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

### Which has better reviews, Symphony by GeoStar or Sub?

Sub is rated higher. Symphony by GeoStar averages 2.0 out of 5 from 4 ratings, while Sub averages 4.4 from 786 ratings.

### Do Symphony by GeoStar or Sub have ads?

Neither Symphony by GeoStar nor Sub shows ads.

### Which is updated more often, Symphony by GeoStar or Sub?

Symphony by GeoStar ships an update every 4 months, and Sub every 5 weeks. Most recently, Symphony by GeoStar was updated on October 24, 2026 and Sub on October 24, 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.*