# BEL vs CST ESS

The clearest difference is update cadence: BEL at fortnightly against CST ESS's every 29 months. BEL also leads on device support. CST ESS's advantage is iOS requirement (15.6 vs 26.0). On price and in-app purchases there is nothing between them.

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

BEL ships an update fortnightly, CST ESS every 29 months. The most recent releases landed on October 11, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | BEL | CST ESS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Fortnightly** | Every 29 months |
| Monetization | Free | — |
| Size | 71 MB | 37 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [BEACON ENERGY (PRIVATE) LIMITED](https://appshunter.io/developer/1584309287) | [无锡乐伏网络科技有限公司](https://appshunter.io/developer/1197246083) |

## What reviewers say

### BEL

[App page](https://appshunter.io/ios/app/bel-connect/id1523014430)

Monitor your solar panel systems from anywhere, anytime. Track energy generation, plant status, and identify potential issues with diagnostic tools and alerts. View weather data and environmental benefits to maximize your solar plant's performance and savings.

**Highlights:** Real-time monitoring, Manage multiple plants, Diagnostic tools and alerts, Plant status and performance graphs, Live weather reports, Plant location mapping, Cost and environmental benefits tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### CST ESS

[App page](https://appshunter.io/ios/app/cst-ess/id6447654088)

**In-app purchases:** none


## Frequently asked questions

### Is BEL free?

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

### Is CST ESS free?

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

### Which is updated more often, BEL or CST ESS?

BEL ships an update fortnightly, and CST ESS every 29 months. Most recently, BEL was updated on October 11, 2026 and CST ESS on October 19, 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.*