Comparison

504 vs Atom School

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

Head to head
About

504

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.

Highlights
  • Essential vocabulary selection
  • Clear definitions and example sentences
  • Native pronunciation audio
  • Interactive learning games (flashcards, quizzes)
  • Progress tracking tools
  • Multi-language support
Features
Read full 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. https://nefarius-apps.github.io/504/privacy-policy https://nefarius-apps.github.io/504/terms-of-use

About

Atom School

Features
Read full description

FirstIdea is a social application that joins parents and schools by some provided ways. Parents can receive messages and news from schools quickly. Likewise they will oversee their student's educational and disciplinary notifications daily. It contains more facilities such as gallery, homeworks reminder and notebooks.

Screenshots

5044 screens
Atom School3 screens

Verdict

The call

The clearest difference is in-app purchases: Atom School at none against 504's 7. Atom School also leads on ads (none vs shown) and iOS requirement (13.0 vs 18.0). 504's advantage is update cadence (fortnightly vs every 20 months). On price 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. 504 sells 6 in-app purchases, starting at $4.99 per 7 days. Atom School asks for nothing beyond the download.

UpkeepUpdate frequency

504 ships an update fortnightly, Atom School every 20 months. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
504 versus Atom School: the parameters behind the verdict, then further details
Parameter504Atom School
PriceFreeFree
Rating4.8 (4.6K ratings) — better—
Positive reviews73.0% of reviews—
Number of ratings4.6K — better—
Update frequencyFortnightly — betterEvery 20 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.013.0 — better
Further details — not scored
Size66 MB27 MB
Age rating4+4+
DeveloperNefarius Appsmeisam mirahsan

Bugs and requests

504

Reported bugs

3 issues
  • Pronunciation not working in latest version
  • Lessons for second half of book blocked behind paywall
  • Compatibility issues with older devices

Requested features

3 requests
  • Add part of speech for each word
  • Include a note box for personal examples
  • Add dark mode option

Atom School

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

504

Subscriptions6
  • Premium$4.997 Days
  • Premium1 Month trial$9.991 Month
  • Premium$9.991 Month
Show 3 more
  • Premium3 Days trial2 variants$9.997 Days
  • Premium$34.991 Year
  • Yearly Pro Membership3 Days trial$59.991 Year
None

Atom School

No in-app purchases

Questions

Is 504 free?
504 is free to download, with in-app purchases available.
Is Atom School free?
Atom School is free to download, with no in-app purchases.
Do 504 or Atom School have ads?
504 shows ads; Atom School does not.
Which is updated more often, 504 or Atom School?
504 ships an update fortnightly, and Atom School every 20 months. Most recently, 504 was updated on November 2, 2026 and Atom School on October 25, 2026.

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