# Circle.ooo vs Chat CT

The clearest difference is update cadence: Circle.ooo at weekly against Chat CT's monthly. 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.

Circle.ooo ships an update weekly, Chat CT monthly. Both last shipped on October 27, 2026.

## The numbers

| Metric | Circle.ooo | Chat CT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Size | 132 MB | 77 MB |
| Requires iOS | 14.0 | 14 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Noww, Inc.](https://appshunter.io/developer/1275092398) | [WATER INSTITUTE OF SCIENCE AND TECHNOLOGY](https://appshunter.io/developer/1761991099) |

## What reviewers say

### Circle.ooo

[App page](https://appshunter.io/ios/app/circleooo/id1611956542)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Chat CT

[App page](https://appshunter.io/ios/app/chat-ct/id6633414878)

**In-app purchases:** none


## Frequently asked questions

### Is Circle.ooo free?

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

### Is Chat CT free?

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

### Do Circle.ooo or Chat CT have ads?

Neither Circle.ooo nor Chat CT shows ads.

### Which is updated more often, Circle.ooo or Chat CT?

Circle.ooo ships an update weekly, and Chat CT monthly. Most recently, Circle.ooo was updated on October 27, 2026 and Chat CT on October 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*