Comparison

NGSL Builder vs Echo Loop

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

Head to head
About

NGSL Builder

This app aids English language learners in mastering essential vocabulary from the New General Service List (NGSL). It offers tools for downloading, organizing, and studying words through science-based methods like spaced repetition flashcards. Track your progress and improve your English fluency efficiently.

Highlights
  • NGSL vocabulary list access
  • Intelligent flashcard system
  • Spaced-repetition learning
  • Progress tracking and recording
  • Wordlist organization
  • Pronunciation guides
Features
Read full description

NGSL Builder: This application is designed to help learners and teachers make use of one of the most important lists of vocabulary words for second language learners of English, the New General Service List (NGSL). The NGSL is a free open source wordlist and is used with permission. The app contains simple tools to help you download, email and organize the NGSL, as well as science-based 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. The original definitions are written in simple English and the app also give you pronunciation of each word by a professional voice talent who is a native speaker of English of North American English. About the NGSL: The New General Service List (usually referred to as the NGSL) was published by Dr. Charles Browne, Dr.Brent Culligan and Joseph Phillips in 2013 after several years of of detailed corpus work with the well-regarded 2 billion word Cambridge English Corpus (CEC) and input from world famous vocabulary specialists such as Paul Nation of University of Victoria in Wellington. The NGSL is a set of 2,800 words selected to be of the greatest "general service" to second language learners of English. Although there are over 600,000 words in the English language, these 2800 cover more than 90% of the words people meet in their daily lives. This list is a major update of the original 1953 GSL list (which only covers about 80%) and is being adopted by a growing number of publishers, companies and online tools for learning, teaching and analyzing text. A fuller discussion of the NGSL including published research can be found at our dedicated website (www.newgeneralservicelist.org). 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

Echo Loop

This app uses a science-based, eight-stage spaced repetition system to improve English listening and speaking skills. It guides users through blind listening, intensive listening, sentence repetition, and paragraph retelling, with AI feedback and vocabulary tools.

Highlights
  • Eight-stage spaced repetition learning
  • Blind and intensive listening modes
  • AI-assisted sentence repetition with feedback
  • Paragraph retelling with keyword generation
  • Bookmarking for sentences and vocabulary
  • Vocabulary flashcard review
  • Learning progress tracking
Features
Read full description

Echo Loop is a science-based English listening and speaking training app. It helps you turn unfamiliar audio into real understanding and build fluency through repetition and retelling. The app combines a complete listening and speaking training loop with spaced repetition. It automatically schedules review tasks, reminds you to practice, and guides you step by step, so you can focus on listening and speaking instead of managing the process yourself. 【Eight-stage spaced repetition】 Each audio item follows an eight-stage learning cycle: initial learning, same-day review, reviews on Days 1, 2, 4, 7, and 14, and completion on Day 28. The app automatically schedules each review to help turn short-term memory into long-term memory. 【Complete initial learning flow】 The initial learning stage includes four steps: • Blind Listening: Listen to the full audio without the transcript, get the general meaning, and rate the difficulty. • Intensive Listening: Listen sentence by sentence. For difficult sentences, view the transcript and save unfamiliar sentences and words. • Sentence Repetition: Repeat saved sentences with transcript support. The number of repetitions is adjusted based on difficulty, and each recording receives instant AI feedback. • Paragraph Retelling: Listen paragraph by paragraph and retell what you hear in your own words with keywords generated by the app. 【Review stages】 From Day 1 to Day 28, review focuses on blind listening, sentence repetition, and paragraph retelling. Retelling segments gradually become longer, helping you build a stronger link between listening input and speaking output. 【Multiple playback options】 Choose from full audio playback, sentence-by-sentence playback, and saved sentences only. You can also adjust repeat count, pauses between sentences, and retelling length. 【Bookmarked sentences and vocabulary】 • Save difficult sentences with one tap and review them across all your audio materials. • Use a built-in local dictionary with phonetic transcriptions, definitions, pronunciations, Collins star ratings, and exam tags for bookmarked words. • Saved words are linked to their source audio and original sentences, so you can learn vocabulary in context. 【Vocabulary flashcard review】 Review words with flashcards showing the word and pronunciation on the front, and definitions plus the original example sentence on the back. It also supports auto flip, smart sorting, and progress tracking. 【AI-assisted learning】 AI can automatically generate English subtitles. During intensive listening, you can view subtitles, AI translations, and grammar explanations. Subtitles can be shown as full sentences or thought groups, helping you recognize collocations in context instead of memorizing isolated words. 【Learning progress tracking】 Track your study streak, listening input, speaking output, and vocabulary growth. You can also resume anytime from where you left off. 【Free Practice Mode】 Besides the guided learning flow, you can also use Free Practice Mode. You can adjust playback speed, choose whether to show subtitles, and save difficult sentences and words. Import the English audio you want to understand quickly, and start practicing listening and speaking in a more effective way. Subscription Information Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your Apple ID account settings. Payment will be charged to your Apple ID account upon confirmation of purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.echo-loop.top/privacy

Screenshots

NGSL Builder4 screens
Echo Loop4 screens

Verdict

The call

The clearest difference is rating: NGSL Builder at 4.7 against Echo Loop's 4.0. NGSL Builder also leads on in-app purchases (none vs 2) and review sentiment (100% vs 83%). Echo Loop's advantage is update cadence (every 4 days vs every 8 months). On price, ads, monetization model 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. Echo Loop sells 2 in-app purchases, starting at $8.99 per month. NGSL Builder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NGSL Builder holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: NGSL Builder has 70 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 100% of NGSL Builder's written reviews are positive against 83% of Echo Loop's.

UpkeepUpdate frequency

NGSL Builder ships an update every 8 months, Echo Loop every 4 days. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard6 real differences · 4 level
NGSL Builder versus Echo Loop: the parameters behind the verdict, then further details
ParameterNGSL BuilderEcho Loop
PriceFreeFree
Rating4.7 (70 ratings) — better4.0 (11 ratings)
Positive reviews100.0% of reviews — better83.3% of reviews
Number of ratings70 — better11
Update frequencyEvery 8 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS7.0 — better15.0
Further details — not scored
Size248 MB165 MB
Age rating4+4+
DeveloperEFL TechnologiesHangzhou Fengchen Hangqi Management Consulting Co., Ltd

Customer experience

NGSL Builder

All ratings64 ratings
Positive95.3%
Neutral3.1%
Negative1.6%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Echo Loop

All ratings11 ratings
Positive72.7%
Neutral0.0%
Negative27.3%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

None

NGSL Builder

No in-app purchases

2 purchases

Echo Loop

Subscriptions2
  • Echo Loop Plus Monthly$8.991 Month
  • Echo Loop Plus Annual1 Year trial$59.991 Year

Questions

Is NGSL Builder free?
NGSL Builder is free to download, with no in-app purchases.
Is Echo Loop free?
Echo Loop is free to download, with in-app purchases available.
Which has better reviews, NGSL Builder or Echo Loop?
NGSL Builder is rated higher. NGSL Builder averages 4.7 out of 5 from 70 ratings, while Echo Loop averages 4.0 from 11 ratings.
Do NGSL Builder or Echo Loop have ads?
Neither NGSL Builder nor Echo Loop shows ads.
Which is updated more often, NGSL Builder or Echo Loop?
NGSL Builder ships an update every 8 months, and Echo Loop every 4 days. Most recently, NGSL Builder was updated on November 1, 2026 and Echo Loop on November 5, 2026.

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