Comparison

GSL Builder Multilingual vs RepeatDuck

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

Head to head
About

GSL Builder Multilingual

Features
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GSL Builder Multilingual: Available in English, Japanese and Thai This application is designed to help learners and teachers make use of the highly regarded General Service List (GSL). The GSL is a free access open source wordlist. This list was modified by Paul Nation and is used with permission The app contains simple tools to help you download, email and organize the GSL, as well as study tools to quickly and efficiently learn the words, keep detailed record of your progress and the ability to email your progress to yourself or a teacher. Definitions are written in simple English, with part of speech, Japanese translation and pronunciation of the word by a native speaker of English also given. About the GSL: The General Service List (usually referred to as the GSL) was published by Michael West in 1953, after more than a decade of detailed corpus work by he and a panel of experts. The GSL is a set of 2,000 words selected to be of the greatest "general service" to second language learners of English. About Intelligent Flashcards: The app also contains an Intelligent Wordlist Maker and Intelligent Flashcard system. The Intelligent Wordlist Maker helps you to quickly and efficiently pick only the words you don’t know for study in the flashcard system. Rather than force you to go through the entire list at once, Intelligent Wordlist Maker guides you through the list by frequency bands, allowing you to add words little by little, just as you need them or when you have time. Based on the well documented science of “spaced-repetition”, the Intelligent Flashcard system systematically and efficiently helps you to review the words several times over a period of a month, giving you extra time with the words that are giving you difficulty.

About

RepeatDuck

Master Chinese vocabulary with intelligent flashcards and spaced repetition. Features audio-based memorization, custom card creation, and detailed progress analytics. Learn efficiently with offline access and customizable reading modes.

Highlights
  • Audio-based memorization
  • Custom flashcard creation
  • Spaced repetition system
  • Progress tracking and analytics
  • Offline mode
  • Configurable learning languages
Features
Read full description

RepeatDuck is an innovative Chinese vocabulary learning app that makes word memorization effortless and engaging through intelligent recognition, personalized flashcards, and a unique spaced repetition system. With its distinctive card creation method and scientifically-proven review algorithms, RepeatDuck helps you master Chinese vocabulary efficiently. 【Core Features】 1. Powerful Effortless Learning Method - Audio-based Memorization: Intensive repetition of word pronunciation enhances memory retention and helps master correct pronunciation - Dynamic Word Display: Innovative dynamic word presentation reinforces memory retention 2. Extensive Learning Content - Comprehensive Vocabulary Lists: From elementary to university level, extensive word lists help expand your vocabulary across all levels - Custom Flashcards: Support manual creation and image-based custom flashcards for personalized learning experience 3. Rich Statistical Analysis - Learning Metrics: Comprehensive tracking of vocabulary progress, learning indicators (word count/duration), and achievement milestones - Visual Analytics: Learning activity heatmap, progress trends, and mastery level trends presented through intuitive charts 4. Thoughtful Additional Features - Offline Mode: Core features available offline for learning anywhere, anytime - Configurable Learning Languages: Easy switching between target languages, currently supporting Chinese and English - Customizable Reading Modes: Flexible configuration for playback methods (single/loop/sequential/random) and reading styles (single word/bilingual) 【RepeatDuck Auto-Renewal Subscription Service Details】 1、 Subscription Service: Professional Version Continuous Package Service 2、Subscription Pricing: Monthly subscription at $0.99/month, Annual subscription at $4.99/year 3、Payment: Purchase will be charged to iTunes Account upon confirmation 4、Your iTunes account will be charged 24 hours before the end of the current period, and the subscription will be extended by one subscription period upon successful payment 5、To cancel subscription, please go to iPhone "Settings" --> "iTunes Store & App Store" --> tap "Apple ID", select "View Apple ID", enter "Account Settings" page, tap "Subscriptions", select "Monthly/Annual Subscription" to cancel. If you don't turn off auto-renewal at least 24 hours before the end of the current period, this subscription will automatically renew Privacy Policy: https://mileson.notion.site/Privacy-Policy-RepeatDuck-17ee107ce54f80758c1dd3f5f6272435?pvs=4 Terms of Use: https://mileson.notion.site/Terms-of-Use-RepeatDuck-180e107ce54f806f9fe7f57290dd04ba?pvs=4 If you enjoy "RepeatDuck", please take a moment to write us a positive review. We greatly appreciate it! Email: libingfeng007@gmail.com

Screenshots

GSL Builder Multilingual4 screens
RepeatDuck4 screens

Verdict

The call

The clearest difference is in-app purchases: GSL Builder Multilingual at none against RepeatDuck's 3. GSL Builder Multilingual also leads on iOS requirement (13.0 vs 15.0). RepeatDuck's advantage is update cadence (every 2 months vs every 108 months). On price, ads and device support 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. RepeatDuck sells 3 in-app purchases, starting at $1.99 per month. GSL Builder Multilingual asks for nothing beyond the download.

UpkeepUpdate frequency

GSL Builder Multilingual ships an update every 108 months, RepeatDuck every 2 months. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

Scorecard3 real differences · 6 level
GSL Builder Multilingual versus RepeatDuck: the parameters behind the verdict, then further details
ParameterGSL Builder MultilingualRepeatDuck
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 108 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.0 — better15.0
Further details — not scored
Size179 MB147 MB
Age rating4+4+
DeveloperEFL TechnologiesChaojifeng (Xiamen) Network Technology Co., Ltd.

In-app purchases

None

GSL Builder Multilingual

No in-app purchases

3 purchases

RepeatDuck

Subscriptions2
  • Monthly Pro$1.991 Month
  • Yearly Pro$9.991 Year
One-time1
  • Lifetime Pro$19.99

Questions

Is GSL Builder Multilingual free?
GSL Builder Multilingual is free to download, with no in-app purchases.
Is RepeatDuck free?
RepeatDuck is free to download, with in-app purchases available.
Do GSL Builder Multilingual or RepeatDuck have ads?
Neither GSL Builder Multilingual nor RepeatDuck shows ads.
Which is updated more often, GSL Builder Multilingual or RepeatDuck?
GSL Builder Multilingual ships an update every 108 months, and RepeatDuck every 2 months. Most recently, GSL Builder Multilingual was updated on October 6, 2026 and RepeatDuck on October 4, 2026.

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