# KKT KOLBE vs KSTAR Sync

The clearest difference is update cadence: KSTAR Sync at every 2 weeks against KKT KOLBE's every 2 months. KKT KOLBE's advantage is iOS requirement (9.0 vs 14.0). 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.

KKT KOLBE ships an update every 2 months, KSTAR Sync every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | KKT KOLBE | KSTAR Sync |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 32 MB | 75 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SHENZHEN SHUOXINDA TECHNOLOGY Co., Ltd.](https://appshunter.io/developer/1650343340) | [Shenzhen Kstar Science & Technology Co., Ltd.](https://appshunter.io/developer/1460236605) |

## What reviewers say

### KKT KOLBE

[App page](https://appshunter.io/ios/app/kkt-kolbe/id6449969333)

Monitor your photovoltaic energy storage system with advanced data collection and analysis. View dynamic graphs and add devices easily for a clear understanding of your energy usage.

**Highlights:** Advanced data monitoring, Dynamic graph display, Clear data visualization, One-click device addition, Professional data analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### KSTAR Sync

[App page](https://appshunter.io/ios/app/kstar-sync/id6754310380)

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

**In-app purchases:** none


## Frequently asked questions

### Is KKT KOLBE free?

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

### Is KSTAR Sync free?

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

### Do KKT KOLBE or KSTAR Sync have ads?

Neither KKT KOLBE nor KSTAR Sync shows ads.

### Which is updated more often, KKT KOLBE or KSTAR Sync?

KKT KOLBE ships an update every 2 months, and KSTAR Sync every 2 weeks. Most recently, KKT KOLBE was updated on October 24, 2026 and KSTAR Sync 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.*