# Signals and Systems vs C++ CPP Test Prep 2025

The clearest difference is iOS requirement: C++ CPP Test Prep 2025 at 15.1 against Signals and Systems's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Signals and Systems sells 6 in-app purchases, starting at $9.99 per month and C++ CPP Test Prep 2025 sells 9 in-app purchases, starting at $8.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Signals and Systems | C++ CPP Test Prep 2025 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Size | 18 MB | 38 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [YAUHEN BAHDANOVICH](https://appshunter.io/developer/1711932790) |

## What reviewers say

### Signals and Systems

[App page](https://appshunter.io/ios/app/signals-and-systems/id6739804680)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


### C++ CPP Test Prep 2025

[App page](https://appshunter.io/ios/app/c-plus-plus-cpp-test-prep-2025/id6746330430)

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CPP Weekly Full Access | $8.99 | per 7 days |
| CPP Monthly Full Access | $24.99 | per month |
| CPP Monthly Full Access | $34.99 | per month |
| CPP Quarterly Full Access | $55.99 | per 3 months |
| CPP Quarterly Full Access | $59.99 | per 3 months |
| CPP Semiannual Full Access | $75.99 | per 6 months |
| CPP Semiannual Full Access | $79.99 | per 6 months |
| CPP Annual Full Access | $109.99 | per year |
| CPP Annual Full Access | $119.99 | per year |


## Frequently asked questions

### Is Signals and Systems free?

Signals and Systems is free to download, with in-app purchases available.

### Is C++ CPP Test Prep 2025 free?

C++ CPP Test Prep 2025 is free to download, with in-app purchases available.

### Do Signals and Systems or C++ CPP Test Prep 2025 have ads?

Neither Signals and Systems nor C++ CPP Test Prep 2025 shows ads.

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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.*