# Twifty Quiz vs InterviewOS

The clearest difference is in-app purchases: InterviewOS at none against Twifty Quiz's 3. InterviewOS also leads on update cadence (every 3 days vs every 2 weeks). Twifty Quiz's advantage is iOS requirement (16.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Twifty Quiz sells 3 in-app purchases, starting at $0.99 per month. InterviewOS asks for nothing beyond the download.

Twifty Quiz ships an update every 2 weeks, InterviewOS every 3 days. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Twifty Quiz | InterviewOS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 6 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aziz Ullah](https://appshunter.io/developer/1704118752) | [Elbek Mirzamaxmudov](https://appshunter.io/developer/1861371580) |

## What reviewers say

### Twifty Quiz

[App page](https://appshunter.io/ios/app/twifty-quiz/id6464455110)

Test your Swift programming knowledge with a fun quiz game. Learn concepts and syntax through detailed explanations for each question. Ideal for aspiring iOS developers and programming enthusiasts.

**Highlights:** Swift syntax and concept questions, Detailed explanations for answers, Suitable for beginners and advanced developers, Learn while playing, iOS app development focus

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Plan | $0.99 | per month |
| Pro Plan | $1.99 | per 3 months |
| Pro Plan | $4.99 | per 6 months |


### InterviewOS

[App page](https://appshunter.io/ios/app/interviewos/id6756553689)

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

**In-app purchases:** none


## Frequently asked questions

### Is Twifty Quiz free?

Twifty Quiz is free to download, with in-app purchases available.

### Is InterviewOS free?

InterviewOS is free to download, with no in-app purchases.

### Do Twifty Quiz or InterviewOS have ads?

Neither Twifty Quiz nor InterviewOS shows ads.

### Which is updated more often, Twifty Quiz or InterviewOS?

Twifty Quiz ships an update every 2 weeks, and InterviewOS every 3 days. Most recently, Twifty Quiz was updated on October 16, 2026 and InterviewOS on October 4, 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.*