# ENS de Lyon vs Chattr

The clearest difference is in-app purchases: ENS de Lyon at none against Chattr's 6. Chattr's advantage is update cadence (every 2 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Chattr sells 6 in-app purchases, starting at $19.99 per month. ENS de Lyon asks for nothing beyond the download.

ENS de Lyon ships an update every 4 months, Chattr every 2 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ENS de Lyon | Chattr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/chattr-conversation-practice/id6768665981/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 68 MB | 102 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Ecole Normale Superieure de Lyon](https://appshunter.io/developer/1687869247) | [FILIPPO PIETRANTONIO](https://appshunter.io/developer/1783662173) |

## What reviewers say

### ENS de Lyon

[App page](https://appshunter.io/ios/app/ens-de-lyon/id6449162106)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Chattr

[App page](https://appshunter.io/ios/app/chattr-conversation-practice/id6768665981)

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $19.99 | per month |
| Full Access | $24.99 | per month |
| 10 Voice Sessions | $9.99 | one-time |
| 25 Voice Sessions | $21.99 | one-time |
| 50 Voice Sessions | $37.99 | one-time |
| 100 Voice Sessions | $69.99 | one-time |


## Frequently asked questions

### Is ENS de Lyon free?

ENS de Lyon is free to download, with no in-app purchases.

### Is Chattr free?

Chattr is free to download, with in-app purchases available.

### Do ENS de Lyon or Chattr have ads?

Neither ENS de Lyon nor Chattr shows ads.

### Which is updated more often, ENS de Lyon or Chattr?

ENS de Lyon ships an update every 4 months, and Chattr every 2 weeks. Most recently, ENS de Lyon was updated on October 8, 2026 and Chattr 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.*