# Enigma JS vs Interview Prep

The clearest difference is update cadence: Interview Prep at every 4 weeks against Enigma JS's every 14 months. Enigma JS's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Enigma JS sells 1 one-off in-app purchase and Interview Prep sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Enigma JS ships an update every 14 months, Interview Prep every 4 weeks. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Enigma JS | Interview Prep |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 14 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 59 MB | 23 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yesno Labs](https://appshunter.io/developer/1704491583) | [Sergei Koniukhovskii](https://appshunter.io/developer/1800965700) |

## What reviewers say

### Enigma JS

[App page](https://appshunter.io/ios/app/enigma-js-interview-questions/id1308401829)

This app offers JavaScript quizzes covering common interview questions for web and mobile developers. It provides detailed explanations to help users learn and practice tricky language concepts and essential React/React Native knowledge.

**Highlights:** Common JavaScript interview questions, React and React Native concepts, Detailed explanations for each question, Quizzes for beginners and experienced developers, Practice tricky language parts

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads and unlock content | $9.99 | one-time |


### Interview Prep

[App page](https://appshunter.io/ios/app/interview-prep-tech-jobs/id6748237280)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FluentLab Pro 1-Month Plan | $9.99 | per month |
| FluentLab Pro 12-Month Plan | $19.99 | per year |


## Frequently asked questions

### Is Enigma JS free?

Enigma JS is free to download, with in-app purchases available.

### Is Interview Prep free?

Interview Prep is free to download, with in-app purchases available.

### Do Enigma JS or Interview Prep have ads?

Both Enigma JS and Interview Prep show ads.

### Which is updated more often, Enigma JS or Interview Prep?

Enigma JS ships an update every 14 months, and Interview Prep every 4 weeks. Most recently, Enigma JS was updated on October 15, 2026 and Interview Prep on October 13, 2026.

---

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