# Cervello ESM vs Zai Chat

The clearest difference is update cadence: Zai Chat at every 3 days against Cervello ESM's every 4 months. 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.

Cervello ESM ships an update every 4 months, Zai Chat every 3 days. The most recent releases landed on October 4, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Cervello ESM | Zai Chat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Size | 104 MB | 48 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cervello Informática LTDA](https://appshunter.io/developer/976302819) | [Hg Consultoria](https://appshunter.io/developer/1888212616) |

## What reviewers say

### Cervello ESM

[App page](https://appshunter.io/ios/app/cervello-esm/id1527272348)

**In-app purchases:** none


### Zai Chat

[App page](https://appshunter.io/ios/app/zai-chat/id6761195334)

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

**In-app purchases:** none


## Frequently asked questions

### Is Cervello ESM free?

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

### Is Zai Chat free?

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

### Do Cervello ESM or Zai Chat have ads?

Neither Cervello ESM nor Zai Chat shows ads.

### Which is updated more often, Cervello ESM or Zai Chat?

Cervello ESM ships an update every 4 months, and Zai Chat every 3 days. Most recently, Cervello ESM was updated on October 4, 2026 and Zai Chat 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.*