# Symphony by GeoStar vs ET2900

The clearest difference is update cadence: ET2900 at every 10 days against Symphony by GeoStar's every 4 months. ET2900 also leads on iOS requirement (13.0 vs 15.0). 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.

Symphony by GeoStar ships an update every 4 months, ET2900 every 10 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Symphony by GeoStar | ET2900 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (4 ratings)](https://appshunter.io/ios/app/symphony-by-geostar/id1161399121/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 17 MB | 50 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [WaterFurnace International](https://appshunter.io/developer/940139733) | [Launch Tech Co., Ltd](https://appshunter.io/developer/447568418) |

## 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


### ET2900

[App page](https://appshunter.io/ios/app/et2900/id6475763943)

**In-app purchases:** none


## Frequently asked questions

### Is Symphony by GeoStar free?

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

### Is ET2900 free?

ET2900 is free to download, with no in-app purchases.

### Do Symphony by GeoStar or ET2900 have ads?

Neither Symphony by GeoStar nor ET2900 shows ads.

### Which is updated more often, Symphony by GeoStar or ET2900?

Symphony by GeoStar ships an update every 4 months, and ET2900 every 10 days. Most recently, Symphony by GeoStar was updated on November 2, 2026 and ET2900 on October 30, 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.*