# Engineering Interview Questions and Answers vs Engineering Formulas

The clearest difference is in-app purchases: Engineering Interview Questions and Answers at none against Engineering Formulas's 3. Engineering Interview Questions and Answers also leads on iOS requirement (6.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Engineering Interview Questions and Answers asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 8, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Engineering Interview Questions and Answers | Engineering Formulas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 12 MB | 45 MB |
| Requires iOS | **6.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [rahul baweja](https://appshunter.io/developer/804610215) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### Engineering Interview Questions and Answers

[App page](https://appshunter.io/ios/app/engineering-interview-questions-and-answers/id1127704412)

**Features:** macOS Compatibility

**In-app purchases:** none


### Engineering Formulas

[App page](https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |
| Lifetime Access | $54.99 | one-time |


## Frequently asked questions

### Is Engineering Interview Questions and Answers free?

Engineering Interview Questions and Answers is free to download, with no in-app purchases.

### Is Engineering Formulas free?

Engineering Formulas is free to download, with in-app purchases available.

### Do Engineering Interview Questions and Answers or Engineering Formulas have ads?

Neither Engineering Interview Questions and Answers nor Engineering Formulas shows ads.

### Which is updated more often, Engineering Interview Questions and Answers or Engineering Formulas?

Engineering Interview Questions and Answers ships an update every 2 months, and Engineering Formulas every 2 months. Most recently, Engineering Interview Questions and Answers was updated on October 8, 2026 and Engineering Formulas on October 20, 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.*