# DataStructureAndAlgorithm vs Signals and Systems

The clearest difference is price: Signals and Systems at Free against DataStructureAndAlgorithm's $7.99. Signals and Systems also leads on update cadence (every 5 weeks vs every 3 months). DataStructureAndAlgorithm's advantage is in-app purchases (none vs 6). On ads, device support and iOS requirement there is nothing between them.

Signals and Systems is free to download; DataStructureAndAlgorithm costs $7.99 up front. Signals and Systems sells 6 in-app purchases, starting at $9.99 per month. DataStructureAndAlgorithm asks for nothing beyond the download.

DataStructureAndAlgorithm ships an update every 3 months, Signals and Systems every 5 weeks. The most recent releases landed on August 2, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | DataStructureAndAlgorithm | Signals and Systems |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Size | 12 MB | 18 MB |
| Requires iOS | **16.3** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Buydeepdiscount.com LLC](https://appshunter.io/developer/817177888) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### DataStructureAndAlgorithm

[App page](https://appshunter.io/ios/app/datastructureandalgorithm/id6503237307)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is DataStructureAndAlgorithm free?

DataStructureAndAlgorithm costs $7.99, with no in-app purchases.

### Is Signals and Systems free?

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

### Do DataStructureAndAlgorithm or Signals and Systems have ads?

Neither DataStructureAndAlgorithm nor Signals and Systems shows ads.

### Which is updated more often, DataStructureAndAlgorithm or Signals and Systems?

DataStructureAndAlgorithm ships an update every 3 months, and Signals and Systems every 5 weeks. Most recently, DataStructureAndAlgorithm was updated on August 2, 2026 and Signals and Systems on September 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.*