Comparison

Enigma JS vs Interview Prep

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Enigma JS

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
Read full description

Enigma is a JavaScript quiz app featuring the most common interview questions. Here, youโ€™ll find tricky parts of JavaScript language and the key concepts essential for React and React Native developers. Whether you are an experienced developer or a beginner, you'll find questions and explanations in this app that will help you learn and practice. Some quizzes are designed to understand the basics, while others targeting tricky parts of the Javascript language that we developers encounter time to time. - Refresh your knowledge by having quick quizzes anywhere during your day. - Stay up-to-date by learning and practicing tricky parts of the language. - For each question see detailed explanations that are designed to help you comprehend the concepts.

About

Interview Prep

Read full description

You can code. You can design systems. But in interviews โ€” the words don't come out the way they should. FluentLab lets you practice tech interviews out loud, with an AI that asks real questions and coaches you on how you answer โ€” not just what you say. Speak. Get scored. Know exactly what to fix. WHAT YOU PRACTISE Behavioral questions, system design, project walkthroughs, standup, stakeholder comms, salary negotiation, full mock interviews. AFTER EVERY SESSION โ€” Verdict: Strong, Good, Needs Work, or Keep Practising โ€” Scored on Structure, Clarity, Impact, Confidence, and English โ€” Your biggest opportunity โ€” the one fix that moves your score most โ€” Correction cheat sheet โ€” exact phrases you got wrong and how to say them better โ€” What you nailed โ€” so you know what's already working BUILT FOR engineers, PMs, and data professionals who are technically excellent โ€” and just need their interviews to show it. 3-day free trial. Cancel anytime. Privacy Policy: https://fluentlab-64e4c.web.app/privacy.html Terms of Service: https://fluentlab-64e4c.web.app/terms.html

Screenshots

Enigma JS4 screens
Interview Prep4 screens

Verdict

The call

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.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences ยท 6 level
Enigma JS versus Interview Prep: the parameters behind the verdict, then further details
ParameterEnigma JSInterview Prep
PriceFreeFree
Positive reviews25.0% of reviewsโ€”
Update frequencyEvery 14 monthsEvery 4 weeks โ€” better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesโ€”
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS15.1 โ€” better17.0
Further details โ€” not scored
Size59 MB23 MB
Age rating4+4+
DeveloperYesno LabsSergei Koniukhovskii

In-app purchases

1 purchases

Enigma JS

One-time1
  • Remove ads and unlock content$9.99
2 purchases

Interview Prep

Subscriptions2
  • FluentLab Pro 1-Month Plan3 Days trial$9.991 Month
  • FluentLab Pro 12-Month Plan3 Days trial$19.991 Year

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.

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