# Soluna vs RPEMS

The clearest difference is update cadence: Soluna at every 2 months against RPEMS's every 10 months. Soluna also leads on iOS requirement (8.0 vs 12.0). 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.

Soluna ships an update every 2 months, RPEMS every 10 months. The most recent releases landed on September 26, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Soluna | RPEMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Size | 27 MB | 13 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DLG ENERGY](https://appshunter.io/developer/1383102028) | [Jiangsu RCT Power Energy Technology Co., Ltd](https://appshunter.io/developer/1577284762) |

## What reviewers say

### Soluna

[App page](https://appshunter.io/ios/app/soluna/id1483178937)

**Features:** macOS Compatibility

**In-app purchases:** none


### RPEMS

[App page](https://appshunter.io/ios/app/rpems/id1598243104)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Soluna free?

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

### Is RPEMS free?

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

### Do Soluna or RPEMS have ads?

Neither Soluna nor RPEMS shows ads.

### Which is updated more often, Soluna or RPEMS?

Soluna ships an update every 2 months, and RPEMS every 10 months. Most recently, Soluna was updated on September 26, 2026 and RPEMS on October 3, 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.*