--- title: "504 - Vocabulary Builder - Reviews, Revenue and Downloads in United States | Apple App Store" description: "Build your vocabulary with 504 Words – a smarter way to learn languages. 504 Words is a language learning app that helps you master the most essential vocabulary through clear definitions, example se" --- # 504 - Vocabulary Builder — United States > Word of the Day & Flashcards ![504 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/a1/74/84/a17484dd-09a2-d4f4-6c33-d3733583706d/AppIcon-0-0-1x_U007epad-0-1-0-85-220.png/434x0w.png) **Developer:** [Nefarius Apps Bilgi Teknolojileri Limited Sirketi](https://apptail.io/developer/nefarius-apps-bilgi-teknolojileri-limited-sirketi-mLJib) **Category:** Education **Rating:** 4.8/5 (4,592 ratings) **Price:** Free **Bundle ID:** com.demirciy.wordpool **Store:** Apple App Store **Country:** United States **Version:** 8.12.1 (released 2026-05-14) **Original Release:** 2019-02-15 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1452101398) **AppTail Page:** [https://apptail.io/app/504-vocabulary-builder-rsHe/united-states](https://apptail.io/app/504-vocabulary-builder-rsHe/united-states) ## 504 Description Build your vocabulary with 504 Words – a smarter way to learn languages. 504 Words is a language learning app that helps you master the most essential vocabulary through clear definitions, example sentences, and interactive games. Whether you're learning English, German, French, or future supported languages, this app is designed to make your progress efficient and enjoyable. Learn the right words We’ve carefully selected 504 high-utility words for each language, focusing on real-world usage and practical communication. Every word comes with: - A clear definition - An example sentence - Native pronunciation Practice through interactive games Make learning fun and effective with built-in study modes: - Flashcards to test your memory - Multiple choice quizzes to reinforce understanding - Listening games to improve your pronunciation and recognition skills These game modes make it easier to retain new words and stay engaged every day. Track your progress Stay motivated with performance tracking tools. Monitor the words you've mastered and focus on areas where you need improvement. Great for daily practice and long-term learning. Multi-language support Start with English, German, and French. More languages will be added soon. Whether you're a beginner or refreshing your knowledge, the app adapts to your level and pace. Designed for all learners 504 Words offers a clean, intuitive interface suitable for learners of all ages. Use it at home, in class, or while traveling. No ads, no distractions—just focused learning. Download 504 Words today and take the first step toward confident communication in any language. ## 504 Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/35/3c/9d/353c9dd7-a2c4-9f36-87e6-6aea6e7dc565/667c11a6-52a0-4c52-a3c6-19eb75770549_Ipad.jpg/2732x2048.png) ## 504 Rating Breakdown in United States - 5 stars: 4,006 (87%) - 4 stars: 340 (7%) - 3 stars: 123 (3%) - 2 stars: 41 (1%) - 1 stars: 82 (2%) ## 504 Reviews in United States ### ***-- "doesn't work" I can't open the app. what's the problem? -- nick apst, 2025-02-14 ### ***** "Questions" I downloaded this app like 2 minutes ago tbh but i have some questions: 1: is there like a premium that you have to pay for? Because I read all the reviews (i like reading reviews for some reason) and some of them complained about premium and I downloaded it expecting to see premium or something but it just said you are already premium so I'm confused on that, 2: the words/lessons, how is words like legend, amend, resign, etc in the last/hardest(????) lesson and words like qualify, abandon, oath, etc in the first/easiest(????) so I'm really confused -- Anna🐢, 2024-12-17 ### *---- "Terrible" Please I’m waiting for new update . This app doesn’t even open properly! -- saaaaabbbbbsaaaav, 2024-08-10 ### ***** "504 review" It’s the best app that I have used in my entire life, I really appreciate creating such an amazing app -- Tawjik, 2024-06-04 ### ***** "Fix problem" Hello,it is great app.However,I updated the software but it doesn't work anymore -- Fa-Saa, 2024-05-23 ### *---- "Data tracking" Sketchy they want to track you across the different apps and websites you use: your user id, device id, usage data, and diagnostics. Instant delete. Edit: don’t believe their response, they would not be required to ask for consent if they didn’t track your data across services owned by other companies. Edit again: the person responding to reviews clearly doesn’t understand data tracking across apps and websites from other companies, sketchy when your app is doing it and it’s literally disclosed on your product page ha -- (: ME :), 2024-05-22 ### ****- "Suggestion" Tnx for you app but i wanna say the reader wasnt good . She reads rapidly n i couldnt realize very well as a amateur person. at least for simple parts should read slowly . Tnx again -- Safuraaa2013, 2023-11-01 ### ***** "My idea 💡" Easy to learn 😉 -- eliyas2010, 2023-08-24 ### ***** "Improvement!" Very excellent practice! Im not a english person so this helps me a lot by learning all these words and the sentences that included words that are previous lesson practice. -- Vongxiong, 2023-08-23 ### ***** "Don’t have dark mode" 😵‍💫😵‍💫😵‍💫😵‍💫 -- aminbit, 2023-02-11 ### *---- "The worst App I’ve ever seen!" This was the worst app I’ve ever seen! You just can use the flashcards. Nothing else! The pronunciation sounds robot-like. It’s not the original one of the book. And it’s constantly asking you to go on premium. I just uninstalled it after day one. -- rudisplanet, 2022-12-22 ### *---- "Lier" You are lier. First give an update as bug fixes. But after update half of book block and i can not see them. Do you know why? Because I am not a premium user!! What a surprise. You are lier -- saeed.h.a, 2022-10-28 ### ****- "Is it 504 essential word book??" Is it 504 essential word book?? -- matab9777, 2022-08-31 ### ***** "Excellent" Very good -- mona 1401, 2022-05-28 ### ***-- "Dont update" Don’t update the app if you already installed the old version, because in the updated version you need to pay money if you wand to access to lessons of the second half of the book. It’s kind of cheat and I feel stupid that i updated the app. -- sadeghsdn, 2022-03-24 ### *---- "Not free" It’s not free to use after lesson 20😑 -- rnq_s, 2022-03-14 ### ***** "Review" this app perfect for who want to learn English -- Hodaasgh67, 2022-01-12 ### ****- "Useful vocabulary exercising on the go" It’s very convenient to use this app instead of the book for learning and reviewing vocabulary any time and in any situation. Yet some other features can be added to make it better, like 1-adding part of speech of each word.2- adding a note box in each word’s place to add notes and personal examples. Thanks for your attention. -- hmarymary, 2022-01-11 ### ***** "Pronunciation problem" Hello, thank you for your app. But it has some problem like i can't use the pronunciation voice -- mr.zaaree, 2021-12-05 ### *---- "My app doesn’t have any sound" I have a problem with pronunciation I can’t hear -- $ar@19941373, 2021-11-24 [View all 504 reviews and detailed analytics on AppTail](https://apptail.io/account/signup?utm_campaign=ai-crawl&utm_content=reviews) ## 504 In-App Purchases | Item | Price | |------|-------| | Premium | $9.99 | | Weekly Premium Membership | $9.99 | | Yearly Pro Membership | $44.99 | | Monthly Pro Membership | $17.99 | | Weekly Pro Membership | $8.99 | | Yearly Premium Membership | $59.99 | | Monthly Premium Membership | $19.99 | ## 504 Discovered Keywords - lexicon delta - lexicont - toefl® writing - ew - english grammar flashcards - oxford thesaurus of english - law vocabulary dictionary - dictionary for learning english vocabulary - learn english flashcards - learn english flash card ## Apps Similar to 504 - [Special English Listening](https://apptail.io/app/special-english-listening-QpJ/united-states) - [Longman Dictionary of English](https://apptail.io/app/longman-dictionary-of-english-vwX/united-states) - [Fastdic - Fast Dictionary](https://apptail.io/app/fastdic-fast-dictionary-wwX/united-states) - [English Listening - 6mins](https://apptail.io/app/english-listening-6mins-zwX/united-states) - [Persian Dictionary - Leitnary](https://apptail.io/app/persian-dictionary-leitnary-uxX/united-states) - [LanGeek | Learn English](https://apptail.io/app/langeek-learn-english-AGac/united-states) - [Essential Words for the TOEFL](https://apptail.io/app/essential-words-for-the-toefl-Fbfd/united-states) - [4K Essential English Words 1](https://apptail.io/app/4k-essential-english-words-1-FpOd/united-states) - [1100 Words You Need to Know...](https://apptail.io/app/1100-words-you-need-to-know-QAfj/united-states) - [Essential Words - 4000](https://apptail.io/app/essential-words-4000-ZjKm/united-states) ## 504 Available In - [United States](https://apptail.io/app/504-vocabulary-builder-rsHe/united-states) - [Canada](https://apptail.io/app/504-vocabulary-builder-rsHe/canada) - [Azerbaijan](https://apptail.io/app/504-vocabulary-builder-rsHe/azerbaijan) - [Türkiye](https://apptail.io/app/504-vocabulary-builder-rsHe/turkey) - [United Kingdom](https://apptail.io/app/504-vocabulary-builder-rsHe/united-kingdom) - [Australia](https://apptail.io/app/504-vocabulary-builder-rsHe/australia) - [Germany](https://apptail.io/app/504-vocabulary-builder-rsHe/germany) - [India](https://apptail.io/app/504-vocabulary-builder-rsHe/india) - [United Arab Emirates](https://apptail.io/app/504-vocabulary-builder-rsHe/united-arab-emirates) - [Pakistan](https://apptail.io/app/504-vocabulary-builder-rsHe/pakistan) - [Sweden](https://apptail.io/app/504-vocabulary-builder-rsHe/sweden) - [Netherlands](https://apptail.io/app/504-vocabulary-builder-rsHe/netherlands) - [Armenia](https://apptail.io/app/504-vocabulary-builder-rsHe/armenia) - [France](https://apptail.io/app/504-vocabulary-builder-rsHe/france) - [Italy](https://apptail.io/app/504-vocabulary-builder-rsHe/italy) - [Kazakhstan](https://apptail.io/app/504-vocabulary-builder-rsHe/kazakhstan) - [Malaysia](https://apptail.io/app/504-vocabulary-builder-rsHe/malaysia) - [Oman](https://apptail.io/app/504-vocabulary-builder-rsHe/oman) - [Denmark](https://apptail.io/app/504-vocabulary-builder-rsHe/denmark) - [Russia](https://apptail.io/app/504-vocabulary-builder-rsHe/russia) - [Finland](https://apptail.io/app/504-vocabulary-builder-rsHe/finland) - [China](https://apptail.io/app/504-vocabulary-builder-rsHe/china) - [Uzbekistan](https://apptail.io/app/504-vocabulary-builder-rsHe/uzbekistan) - [Singapore](https://apptail.io/app/504-vocabulary-builder-rsHe/singapore) - [Japan](https://apptail.io/app/504-vocabulary-builder-rsHe/japan) - [Saudi Arabia](https://apptail.io/app/504-vocabulary-builder-rsHe/saudi-arabia) - [Spain](https://apptail.io/app/504-vocabulary-builder-rsHe/spain) - [New Zealand](https://apptail.io/app/504-vocabulary-builder-rsHe/new-zealand) - 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[Latvia](https://apptail.io/app/504-vocabulary-builder-rsHe/latvia) - [North Macedonia](https://apptail.io/app/504-vocabulary-builder-rsHe/north-macedonia) - [Malta](https://apptail.io/app/504-vocabulary-builder-rsHe/malta) - [Lebanon](https://apptail.io/app/504-vocabulary-builder-rsHe/lebanon) - [Iceland](https://apptail.io/app/504-vocabulary-builder-rsHe/iceland) - [Argentina](https://apptail.io/app/504-vocabulary-builder-rsHe/argentina) - [Egypt](https://apptail.io/app/504-vocabulary-builder-rsHe/egypt) - [Peru](https://apptail.io/app/504-vocabulary-builder-rsHe/peru) - [Ecuador](https://apptail.io/app/504-vocabulary-builder-rsHe/ecuador) - [Dominican Republic](https://apptail.io/app/504-vocabulary-builder-rsHe/dominican-republic) - [Czechia](https://apptail.io/app/504-vocabulary-builder-rsHe/czechia) - [Colombia](https://apptail.io/app/504-vocabulary-builder-rsHe/colombia) - [Chile](https://apptail.io/app/504-vocabulary-builder-rsHe/chile) - [Angola](https://apptail.io/app/504-vocabulary-builder-rsHe/angola) - [Thailand](https://apptail.io/app/504-vocabulary-builder-rsHe/thailand) - [Tunisia](https://apptail.io/app/504-vocabulary-builder-rsHe/tunisia) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. 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