# SOLID Architecture vs Supply & Demand Lab by CS

The clearest difference is ads: SOLID Architecture at none against Supply & Demand Lab by CS's shown. SOLID Architecture also leads on iOS requirement (15.0 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. SOLID Architecture sells 3 one-off in-app purchases and Supply & Demand Lab by CS sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | SOLID Architecture | Supply & Demand Lab by CS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | — |
| Size | 102 MB | 9 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Airton Siqueira de Freitas](https://appshunter.io/developer/1809776051) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### 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 |


### Supply & Demand Lab by CS

[App page](https://appshunter.io/ios/app/supply-and-demand-lab-by-cs/id6762558374)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Upgrade | $2.99 | one-time |


## Frequently asked questions

### Is SOLID Architecture free?

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

### Is Supply & Demand Lab by CS free?

Supply & Demand Lab by CS is free to download, with in-app purchases available.

### Do SOLID Architecture or Supply & Demand Lab by CS have ads?

Supply & Demand Lab by CS shows ads; SOLID Architecture does not.

---

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