Comparison

Symphony by GeoStar vs Sub

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Remote system monitoring
  • Real-time feedback
  • Temperature and program control
  • Energy usage tracking
  • Equipment alerts and reminders
  • Cloud-based access
Features
Read full description

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.

About

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.

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
Read full description

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

Symphony by GeoStar3 screens
Sub4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard5 real differences · 5 level
Symphony by GeoStar versus Sub: the parameters behind the verdict, then further details
ParameterSymphony by GeoStarSub
PriceFreeFree
Rating2.0 (4 ratings)4.4 (786 ratings) — better
Positive reviews0.0% of reviews14.7% of reviews — better
Number of ratings4786 — better
Update frequencyEvery 4 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.5
Further details — not scored
Size17 MB69 MB
Age rating4+4+
DeveloperWaterFurnace InternationalSub-Zero and Wolf

Customer experience

Symphony by GeoStar

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Sub

All ratings778 ratings
Positive85.1%
Neutral3.0%
Negative12.0%
Written reviews177 reviews
Positive14.7%
Neutral8.5%
Negative76.8%

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

None

Symphony by GeoStar

No in-app purchases

None

Sub

No in-app purchases

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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