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504 - Vocabulary Builder

504 - Vocabulary Builder

Popular daily common words

4.6K ratings
46 reviews
With Ads
📚 Education
📊 Productivity
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • February 15, 2019
  • June 29, 2026

Features

Developer

Nefarius Apps Bilgi Teknolojileri Limited Sirketi
✨Promote your app ✨
504 - Vocabulary Builder screenshot #1 for iPad
🧾$4.99 - $79.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐46
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📝8+ tags
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🔄6+ apps
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🎪3 happening
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❓5 answered
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📦~ in 2 weeks
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About

Master essential vocabulary with this language learning app. It offers clear definitions, example sentences, and native pronunciation for high-utility words. Engage with interactive games like flashcards and quizzes to reinforce learning and track your progress effectively.

✓Essential vocabulary selection
✓Clear definitions and example sentences
✓Native pronunciation audio
✓Interactive learning games (flashcards, quizzes)
✓Progress tracking tools
✓Multi-language support
Show original description

What users say

Summarized from real user reviews of 504. Based on 4.6K reviews and a 4.8/5 average, it highlights the 3 positives and 3 negatives reviewers mention most about this Education app.

Positive things

  • 🚀Easy to learn
  • 👍Useful vocabulary practice
  • 🚀Convenient for learning on the go

Negative things

  • 🐛Bugs and glitches in latest version
  • 🔒Concerns about data tracking
  • 🔊Issues with pronunciation and audio
See all reviews

What's New in 504

8.12.3

June 29, 2026

We keep the app updated to provide you with the best user experience!

Subscription plans

Weekly Pro Membership

Pro features for a week

$8.997 Days
3 Days trial
How to cancel 504 subscription ⁉️
7

In-App Purchases

$79.99

Lifetime Access

Unlock special words and games

Events

Read more about Mother's Day: Words of Love
Event EndedSpecial Event

Mother's Day: Words of Love

A special vocabulary lesson for Mother's Day

May 2, 2026 — Jun 2, 2026

Read More

Read more about Labor Day: 504 Words Special
Event EndedSpecial Event

Labor Day: 504 Words Special

Your vocabulary builder for Workers' May

Apr 22, 2026 — May 22, 2026

Read More

Read more about Fooled You! Hidden Match
Event EndedChallenge

Fooled You! Hidden Match

Your favorite AEW stars pulled a fast one!

Mar 27, 2026 — Apr 7, 2026

Read More

See All

User reviews

Most RecentHighest RatedLowest Rated

English Audio Reading French Words Not Good

I set up the app to ostensibly teach me intermediate-level French vocabulary. The French words appeared in individual cards with French synonyms and example sentences. All fine so far. But when I pressed the audio pronunciation button next to the French vocab words, the built-in text-to-speech reader was an English voice which wrecked the pronunciation of the French words. This made the app essentially useless for my purposes. Unfortunate to say the least.
Show more
kalikokaliko

doesn't work

I can't open the app. what's the problem?
nick apstnick apst

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
Show more
A (Laurens) Hamilton fanA (Laurens) Hamilton fan

Terrible

Please I’m waiting for new update .
This app doesn’t even open properly!
saaaaabbbbbsaaaavsaaaaabbbbbsaaaav

504 review

It’s the best app that I have used in my entire life, I really appreciate creating such an amazing app
TawjikTawjik
See 41 more reviews

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User experience

🐞

Reported Bugs

3 issues

Pronunciation not working in latest version

Bug

Lessons for second half of book blocked behind paywall

Bug

Compatibility issues with older devices

Bug
✨

Requested Features

3 requests

Add part of speech for each word

Feature

Include a note box for personal examples

Feature

Add dark mode option

Feature

FAQ

What does the 504 Words app do?

This app helps you build your vocabulary by focusing on essential words for effective communication. It provides clear definitions, example sentences, and native pronunciation for each word. You can also practice what you learn through interactive games and track your progress.

What are the key features of 504 Words?

Key features include a curated list of high-utility words, detailed definitions, example sentences, native pronunciation, and interactive study modes like flashcards, multiple-choice quizzes, and listening games. It also offers progress tracking and multi-language support.

Is 504 Words free to use?

The app is free to download and use, but it offers in-app purchases. This means you can access core features for free, with options to buy additional content or features.

What languages does 504 Words support?

Currently, the app supports English, German, and French. The developers plan to add more languages in the future, expanding its utility for a wider range of learners.

Who is the target audience for this app?

The app is designed for all learners, from beginners to those looking to refresh their knowledge. Its intuitive interface and adaptive learning approach make it suitable for users of any age who want to improve their language skills for real-world communication.