# iCYPHER Chat vs CST ESS

The clearest difference is update cadence: iCYPHER Chat at every 4 days against CST ESS's every 29 months. iCYPHER Chat also leads on device support and iOS requirement (12.1 vs 15.6). 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.

iCYPHER Chat ships an update every 4 days, CST ESS every 29 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | iCYPHER Chat | CST ESS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/icypher-chat/id1587811159/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Every 4 days** | Every 29 months |
| Monetization | Free | — |
| Size | 121 MB | 37 MB |
| Requires iOS | **12.1** | 15.6 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [The Concrete Protector](https://appshunter.io/developer/1052275730) | [无锡乐伏网络科技有限公司](https://appshunter.io/developer/1197246083) |

## What reviewers say

### iCYPHER Chat

[App page](https://appshunter.io/ios/app/icypher-chat/id1587811159)

Secure your conversations with an app designed to prevent tracking, eavesdropping, and data theft. Enjoy private messaging without worrying about your information being compromised.

**Highlights:** Stops tracking, Prevents eavesdropping, Protects against data theft, Instant security, Private conversations

**Features:** macOS Compatibility, Siri integration

**In-app purchases:** none


### CST ESS

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

**In-app purchases:** none


## Frequently asked questions

### Is iCYPHER Chat free?

iCYPHER Chat 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, iCYPHER Chat or CST ESS?

iCYPHER Chat ships an update every 4 days, and CST ESS every 29 months. Most recently, iCYPHER Chat was updated on October 30, 2026 and CST ESS on October 30, 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.*