# Signals and Systems vs C++ Data Structures & Algo

The clearest difference is in-app purchases: C++ Data Structures & Algo at none against Signals and Systems's 6. Signals and Systems's advantage is update cadence (every 5 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Signals and Systems sells 6 in-app purchases, starting at $9.99 per month. C++ Data Structures & Algo asks for nothing beyond the download.

Signals and Systems ships an update every 5 weeks, C++ Data Structures & Algo every 3 months. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Signals and Systems | C++ Data Structures & Algo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Size | 18 MB | 18 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## 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++ Data Structures & Algo

[App page](https://appshunter.io/ios/app/c-plus-plus-data-structures-and-algo/id6756428007)

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

**In-app purchases:** none


## Frequently asked questions

### Is Signals and Systems free?

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

### Is C++ Data Structures & Algo free?

C++ Data Structures & Algo is free to download, with no in-app purchases.

### Do Signals and Systems or C++ Data Structures & Algo have ads?

Neither Signals and Systems nor C++ Data Structures & Algo shows ads.

### Which is updated more often, Signals and Systems or C++ Data Structures & Algo?

Signals and Systems ships an update every 5 weeks, and C++ Data Structures & Algo every 3 months. Most recently, Signals and Systems was updated on October 7, 2026 and C++ Data Structures & Algo on October 12, 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.*