# C Interview Questions vs C++ Data Structures & Algo

The clearest difference is in-app purchases: C++ Data Structures & Algo at none against C Interview Questions's 1. C++ Data Structures & Algo also leads on ads (none vs shown) and update cadence (every 3 months vs every 51 months). C Interview Questions's advantage is iOS requirement (14.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. C Interview Questions sells 1 one-off in-app purchase. C++ Data Structures & Algo asks for nothing beyond the download.

C Interview Questions ships an update every 51 months, C++ Data Structures & Algo every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | C Interview Questions | C++ Data Structures & Algo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 51 months | **Every 3 months** |
| Size | 16 MB | 18 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RAVINDHIRAN SUMITHRA](https://appshunter.io/developer/1571016391) | [ALG Software Lab SIA](https://appshunter.io/developer/1650561236) |

## What reviewers say

### C Interview Questions

[App page](https://appshunter.io/ios/app/c-interview-questions/id1070985063)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C Interview Questions Adfree | $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 C Interview Questions free?

C Interview Questions 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 C Interview Questions or C++ Data Structures & Algo have ads?

C Interview Questions shows ads; C++ Data Structures & Algo does not.

### Which is updated more often, C Interview Questions or C++ Data Structures & Algo?

C Interview Questions ships an update every 51 months, and C++ Data Structures & Algo every 3 months. Most recently, C Interview Questions was updated on November 2, 2026 and C++ Data Structures & Algo on November 3, 2026.

---

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