# CDP Knowledge Test vs SOLID Architecture

The clearest difference is update cadence: SOLID Architecture at every 9 days against CDP Knowledge Test's every 3 months. SOLID Architecture also leads on iOS requirement (15.0 vs 17.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. CDP Knowledge Test sells 2 in-app purchases, starting at $11.99 per month and SOLID Architecture sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

CDP Knowledge Test ships an update every 3 months, SOLID Architecture every 9 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | CDP Knowledge Test | SOLID Architecture |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Size | 9 MB | 103 MB |
| Requires iOS | 17.2 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [Airton Siqueira de Freitas](https://appshunter.io/developer/1809776051) |

## What reviewers say

### CDP Knowledge Test

[App page](https://appshunter.io/ios/app/cdp-knowledge-test/id6740606245)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly subscription | $11.99 | per month |
| Lifetime version | $24.99 | one-time |


### SOLID Architecture

[App page](https://appshunter.io/ios/app/solid-architecture/id6755614891)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CERTIFICATE OF COMPLETION | $2.99 | one-time |
| Premium access | $4.99 | one-time |
| FULL PASS ALL APPS | $17.99 | one-time |


## Frequently asked questions

### Is CDP Knowledge Test free?

CDP Knowledge Test is free to download, with in-app purchases available.

### Is SOLID Architecture free?

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

### Do CDP Knowledge Test or SOLID Architecture have ads?

Neither CDP Knowledge Test nor SOLID Architecture shows ads.

### Which is updated more often, CDP Knowledge Test or SOLID Architecture?

CDP Knowledge Test ships an update every 3 months, and SOLID Architecture every 9 days. Most recently, CDP Knowledge Test was updated on October 30, 2026 and SOLID Architecture on November 5, 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.*