Symphony by GeoStar vs Sub
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Symphony by GeoStar
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.
- Remote system monitoring
- Real-time feedback
- Temperature and program control
- Energy usage tracking
- Equipment alerts and reminders
- Cloud-based access
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Symphony is a WiFi enabled comfort platform that’s unsurpassed in its ease of use, features and capabilities. It provides detailed system feedback in real-time and the tools to control it. Symphony marries the Aurora controls of your Geostar geothermal unit with the Aurora Weblink router, providing access to your equipment from practically anywhere. Symphony is cloud-based so there’s no software to install and provides control over your entire geothermal system - not just the thermostat as in other ‘smart thermostat’ systems. Symphony allows you to: • View and control your geothermal system’s operation from anywhere using a laptop, smart phone or tablet using an intuitive dashboard for quick access to your unit’s status, operation history, alert history, and energy usage. • Remotely control temperatures and programs for up to 6 zones (requires the IntelliZone2 zoning system). • Observe and track your unit’s energy use for the last 13 months. • Provide equipment performance data to dealers for remote monitoring and diagnosis. • Receive equipment alerts and service reminders (as well as your dealer) via email and texts.
Sub
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.
- 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
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Elevate your kitchen experience with the Sub-Zero Group Owner’s App. Connect your Wi-Fi-enabled appliances and enjoy greater control, personalized cooking, and now, integrated wine inventory management. • Build and manage your wine collection • Scan bottles to quickly add wines to your inventory • Track where each bottle is stored across locations • Organize your collection with filters, groups, and tags • View inventory history as wines are enjoyed over time • Enjoy a guided cooking experience with recipes tailored to your appliances • Set timers and view oven status directly from recipe steps • Monitor and control your appliances from anywhere • Receive notifications for appliance status, maintenance, and more The app also gives you powerful control over your Sub-Zero refrigeration and Cove dishwashing appliances. Start your dishwasher remotely, monitor cycles, and manage supplies Wine Inventory transforms a traditionally manual task into a simple, intuitive experience. Manage your collection, understand where your wines are stored, and stay connected to your kitchen in one place. Download now and get more from every Sub-Zero, Wolf, and Cove appliance.
Screenshots
Verdict
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.
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.
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.
| Parameter | Symphony by GeoStar | Sub |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (4 ratings) | 4.4 (786 ratings) — better |
| Positive reviews | 0.0% of reviews | 14.7% of reviews — better |
| Number of ratings | 4 | 786 — better |
| Update frequency | Every 4 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 17 MB | 69 MB |
| Age rating | 4+ | 4+ |
| Developer | WaterFurnace International | Sub-Zero and Wolf |
Customer experience
Symphony by GeoStar
Sub
Bugs and requests
Symphony by GeoStar
Not enough reviews yet to summarise bugs or requests.
Sub
Reported bugs
4 issues- App crashes after recent updates
- Unable to log in or register account
- Appliances disappear from the app
- Firmware update failures brick appliances
Requested features
3 requests- Add support for Celsius temperature units
- Provide real-time temperature and energy consumption data
- Integrate with smart home platforms like Apple HomeKit
In-app purchases
Symphony by GeoStar
No in-app purchases
Sub
No in-app purchases









