# Circle Scaffold vs CBTD

The clearest difference is iOS requirement: CBTD at 15.6 against Circle Scaffold's 18.1. On price, update cadence, ads 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.

Circle Scaffold ships an update weekly, CBTD fortnightly. The most recent releases landed on October 3, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Circle Scaffold | CBTD |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Size | 57 MB | 14 MB |
| Requires iOS | 18.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Scaffold Education](https://appshunter.io/developer/1445578799) | [Abtd Associacao Brasileira de Treinamento](https://appshunter.io/developer/1440259118) |

## What reviewers say

### Circle Scaffold

[App page](https://appshunter.io/ios/app/circle-scaffold/id6478509905)

**In-app purchases:** none


### CBTD

[App page](https://appshunter.io/ios/app/cbtd/id6759922432)

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

**In-app purchases:** none


## Frequently asked questions

### Is Circle Scaffold free?

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

### Is CBTD free?

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

### Do Circle Scaffold or CBTD have ads?

Neither Circle Scaffold nor CBTD shows ads.

### Which is updated more often, Circle Scaffold or CBTD?

Circle Scaffold ships an update weekly, and CBTD fortnightly. Most recently, Circle Scaffold was updated on October 3, 2026 and CBTD on October 11, 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.*