# AUXSOL vs KarstCharge

The clearest difference is update cadence: KarstCharge at every 4 days against AUXSOL's fortnightly. KarstCharge 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.

AUXSOL ships an update fortnightly, KarstCharge every 4 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | AUXSOL | KarstCharge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/auxsol/id6449678866/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free | — |
| Size | 137 MB | 65 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [NINGBO AUX SOLAR TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1690040159) | [Karstcom Tech (Shenzhen)](https://appshunter.io/developer/1845292130) |

## What reviewers say

### AUXSOL

[App page](https://appshunter.io/ios/app/auxsol/id6449678866)

Monitor PV inverters and devices in real-time with accurate messaging and intelligent alarms. This app calculates energy and efficiency, quickly locating faults to assist with efficient operation and maintenance.

**Highlights:** Real-time PV inverter monitoring, Accurate message push, Intelligent alarm system, Efficient operation and maintenance, Remote upgrade control, Statistical analysis

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### KarstCharge

[App page](https://appshunter.io/ios/app/karstcharge/id6753860855)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is AUXSOL free?

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

### Is KarstCharge free?

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

### Do AUXSOL or KarstCharge have ads?

Neither AUXSOL nor KarstCharge shows ads.

### Which is updated more often, AUXSOL or KarstCharge?

AUXSOL ships an update fortnightly, and KarstCharge every 4 days. Most recently, AUXSOL was updated on October 30, 2026 and KarstCharge on October 24, 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.*