# Cathay vs Cleantech Forums

The clearest difference is update cadence: Cleantech Forums at every 2 weeks against Cathay's every 13 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.

Cathay ships an update every 13 months, Cleantech Forums every 2 weeks. The most recent releases landed on September 8, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Cathay | Cleantech Forums |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 weeks** |
| Size | 21 MB | 72 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Cathay Innovation SAS](https://appshunter.io/developer/1596959525) | [CTG:I LLC](https://appshunter.io/developer/1771675672) |

## What reviewers say

### Cathay

[App page](https://appshunter.io/ios/app/cathay/id1596959523)

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

**In-app purchases:** none


### Cleantech Forums

[App page](https://appshunter.io/ios/app/cleantech-forums/id6736369386)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cathay free?

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

### Is Cleantech Forums free?

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

### Do Cathay or Cleantech Forums have ads?

Neither Cathay nor Cleantech Forums shows ads.

### Which is updated more often, Cathay or Cleantech Forums?

Cathay ships an update every 13 months, and Cleantech Forums every 2 weeks. Most recently, Cathay was updated on September 8, 2026 and Cleantech Forums on September 13, 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.*