Comparison

JavaScript Manual vs Java Prep

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

Head to head
About

JavaScript Manual

An offline, ad-free guide to JavaScript, covering its core guide, built-in objects, and Web API. Access comprehensive documentation without an internet connection.

Highlights
  • JavaScript guide
  • Built-in objects
  • Web API documentation
  • Offline access
  • Ad-free experience
Features
Read full description

JavaScript Manual - Complete Offline Reference Your go-to companion for JavaScript development. Read everything from ES6+ basics to Web APIs anytime, anywhere - fully offline. Three core modules: - JavaScript Guide: variables, functions, closures, async/await, prototypes and modern ES6+ syntax - Built-in Objects: Array, Object, String, Number, Date, RegExp, Map, Set, Promise and more, with methods and examples - Web API: DOM, Fetch, Storage, Canvas, WebSocket and browser interfaces Why developers love it: - 100% offline - all content stored on your device - Zero ads - clean, distraction-free reading - Lightweight and fast - built for quick lookups Perfect for learning, coding reference, interview prep, and offline study. Questions or feedback? Contact: devspera@outlook.com

About

Java Prep

Features
Read full description

Java Interview Guide is your ultimate companion for mastering Java interviews. It offers a curated collection of common interview questions, detailed answers, and practical examples covering core Java, data structures, algorithms, Spring, multithreading, databases, and more. Whether you're preparing for your first job or aiming for a top tech company, this app helps you review efficiently, practice smart, and stay confident. --I hope every job seeker can find a job that satisfies them [Java Interview Guide – Auto-Renewing VIP Subscription Terms] — VIP Membership Benefits: Subscribing unlocks full access to all interview question types, including intermediate and advanced questions, real-world scenarios, questions from top tech companies, system design topics, web-related questions, and ongoing content updates. Enjoy unlimited access with no ads. — Subscription Plans & Pricing: Java Interview Guide – Monthly VIP Membership (Auto-Renewing): US$0.99/month (renews automatically every month), with a 7-day free trial. Java Interview Guide – Quarterly VIP Membership (Auto-Renewing): US$2.99/quarter (renews automatically every 3 months), with a 7-day free trial. Java Interview Guide – Semi-Annual VIP Membership (Auto-Renewing): US$5.99/half-year (renews automatically every 6 months), with a 7-day free trial. — Payment Terms: Payment will be charged to your Apple ID account upon confirmation of purchase. Your subscription will automatically renew and be charged within 24 hours prior to the end of the current billing period. You can manage and cancel your subscription in your Apple ID account settings. — Free Trial Policy: A 7-day free trial is available for first-time subscribers. If you cancel during the trial period, you won’t be charged. You may continue using the service until the end of the trial. — How to Cancel Auto-Renewal: To avoid automatic renewal, cancel at least 24 hours before the current period ends. Go to: Settings > Apple ID > Subscriptions and turn off auto-renew. — Privacy Policy & Terms of Use: Privacy Policy: https://blog.csdn.net/MyEclipse927/article/details/133379708?spm=1001.2014.3001.5501 Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

JavaScript Manual4 screens
Java Prep4 screens

Verdict

The call

The clearest difference is in-app purchases: JavaScript Manual at none against Java Prep's 3. Java Prep's advantage is update cadence (every 6 weeks vs every 31 months). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Java Prep sells 3 in-app purchases, starting at $0.99 per month. JavaScript Manual asks for nothing beyond the download.

UpkeepUpdate frequency

JavaScript Manual ships an update every 31 months, Java Prep every 6 weeks. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

Scorecard2 real differences · 8 level
JavaScript Manual versus Java Prep: the parameters behind the verdict, then further details
ParameterJavaScript ManualJava Prep
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 31 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.0 — better16
Further details — not scored
Size34 MB17 MB
Age rating4+9+
DeveloperHua Yang嘉 邱

In-app purchases

None

JavaScript Manual

No in-app purchases

3 purchases

Java Prep

Subscriptions3
  • Monthly Membership7 Days trial$0.991 Month
  • Quarterly Membership7 Days trial$2.993 Months
  • Semi-Annual Membership7 Days trial$5.996 Months

Questions

Is JavaScript Manual free?
JavaScript Manual is free to download, with no in-app purchases.
Is Java Prep free?
Java Prep is free to download, with in-app purchases available.
Do JavaScript Manual or Java Prep have ads?
Neither JavaScript Manual nor Java Prep shows ads.
Which is updated more often, JavaScript Manual or Java Prep?
JavaScript Manual ships an update every 31 months, and Java Prep every 6 weeks. Most recently, JavaScript Manual was updated on October 7, 2026 and Java Prep on October 2, 2026.

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