# CST ESS vs SEFLINK

The clearest difference is update cadence: SEFLINK at monthly against CST ESS's every 29 months. SEFLINK also leads on device support. CST ESS's advantage is iOS requirement (15.6 vs 17.6). 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.

CST ESS ships an update every 29 months, SEFLINK monthly. The most recent releases landed on October 1, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CST ESS | SEFLINK |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 29 months | **Monthly** |
| Size | 37 MB | 65 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [无锡乐伏网络科技有限公司](https://appshunter.io/developer/1197246083) | [ALTERMEDIA](https://appshunter.io/developer/1705705854) |

## What reviewers say

### CST ESS

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

**In-app purchases:** none


### SEFLINK

[App page](https://appshunter.io/ios/app/seflink/id6464300879)

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

**In-app purchases:** none


## Frequently asked questions

### Is CST ESS free?

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

### Is SEFLINK free?

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

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

CST ESS ships an update every 29 months, and SEFLINK monthly. Most recently, CST ESS was updated on October 1, 2026 and SEFLINK on October 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.*