# Fronius Solar.SOS vs RCMI

Fronius Solar.SOS and RCMI are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Fronius Solar.SOS ships an update every 3 months, RCMI every 2 months. The most recent releases landed on August 19, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Fronius Solar.SOS | RCMI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.5 (2 ratings)](https://appshunter.io/ios/app/fronius-solarsos/id1516602936/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 15 MB | 30 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Fronius International GmbH](https://appshunter.io/developer/431601279) | [Shanghai Rockcore Electronic Technology Co.,Ltd](https://appshunter.io/developer/1031556232) |

## What reviewers say

### Fronius Solar.SOS

[App page](https://appshunter.io/ios/app/fronius-solarsos/id1516602936)

This business tool helps installers quickly resolve technical issues with solar systems. It allows for easy ordering of replacement parts and provides access to important documentation. The app streamlines the service process directly at the installation site.

**Highlights:** Manage multiple accounts, Order replacement parts, Track order status, Messaging with support, Access installation guides, Troubleshoot technical issues

**In-app purchases:** none


### RCMI

[App page](https://appshunter.io/ios/app/rcmi/id1670782799)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fronius Solar.SOS free?

Fronius Solar.SOS is free to download, with no in-app purchases.

### Is RCMI free?

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

### Do Fronius Solar.SOS or RCMI have ads?

Neither Fronius Solar.SOS nor RCMI shows ads.

### Which is updated more often, Fronius Solar.SOS or RCMI?

Fronius Solar.SOS ships an update every 3 months, and RCMI every 2 months. Most recently, Fronius Solar.SOS was updated on August 19, 2026 and RCMI on September 10, 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.*