# InterviewOS vs Drill Test

The clearest difference is in-app purchases: InterviewOS at none against Drill Test's 5. InterviewOS also leads on update cadence (every 3 days vs every 9 days). Drill Test's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 26.0). On price and ads there is nothing between them.

Both are free to download. Drill Test sells 5 in-app purchases, starting at $9.99 per month. InterviewOS asks for nothing beyond the download.

InterviewOS ships an update every 3 days, Drill Test every 9 days. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | InterviewOS | Drill Test |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 9 days |
| Size | 6 MB | 40 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Elbek Mirzamaxmudov](https://appshunter.io/developer/1861371580) | [Tai Tran Dinh](https://appshunter.io/developer/6798584353) |

## What reviewers say

### InterviewOS

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

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

**In-app purchases:** none


### Drill Test

[App page](https://appshunter.io/ios/app/drill-test/id6798584231)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access Monthly | $9.99 | per month |
| Premium Access Monthly | $29.99 | per month |
| Pro Access Yearly | $79.99 | per year |
| Premium Access Yearly | $289.00 | per year |
| AI Mastery Pack | $19.99 | one-time |


## Frequently asked questions

### Is InterviewOS free?

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

### Is Drill Test free?

Drill Test is free to download, with in-app purchases available.

### Do InterviewOS or Drill Test have ads?

Neither InterviewOS nor Drill Test shows ads.

### Which is updated more often, InterviewOS or Drill Test?

InterviewOS ships an update every 3 days, and Drill Test every 9 days. Most recently, InterviewOS was updated on October 4, 2026 and Drill Test on October 9, 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.*