---
title: "Codex4 - For Serious Study - Reviews, Revenue and Downloads in Belgium | Apple App Store"
description: "Get fluent faster by learning the words you actually use.  Codex4 helps you build a usable vocabulary and keep it for the long term.  - Learn what you need: Add your own words from any text in one tap"
---

# Codex4 - For Serious Study — Belgium
> For serious language learners

![Codex4 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ca/10/2d/ca102d9f-e83e-6806-b207-13d48c47e784/AppIcon-0-0-1x_U007ephone-0-1-85-220.png/434x0w.png)

**Developer:** [Jonas Richner](https://apptail.io/developer/jonas-richner-PIgOJ)
**Category:** Education
**Rating:** 1.0/5 (2 ratings)
**Price:** Free
**Bundle ID:** com.codex4.app
**Store:** Apple App Store
**Country:** Belgium
**Version:** 3.66 (released 2026-04-14)
**Original Release:** 2025-05-29
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/be/app/app/id6743228019)
**AppTail Page:** [https://apptail.io/app/codex4-for-serious-study-UOxw/belgium](https://apptail.io/app/codex4-for-serious-study-UOxw/belgium)

## Codex4 Description
Get fluent faster by learning the words you actually use.

Codex4 helps you build a usable vocabulary and keep it for the long term.

- Learn what you need: Add your own words from any text in one tap. Build vocabulary for your job, studies, or hobbies.
- Retain more with less effort: Reviews are timed by FSRS (a modern spaced-repetition model) so you study exactly when it counts.
- Master real usage: The app treats each word as a lemma, so forms and conjugations are covered naturally as you progress.
- Stay organized and motivated: Clear stats show what’s due, what’s known, and what’s next.
- Bring any content: Automatic word extraction and a context-aware lemmatizer handle homonyms and multi-word phrases.
- Your data stays yours: Keep access to review even after unsubscribing, and export your words and learning data anytime.

- No gimmicks: Fast sessions, clean design, built for serious learners.

Terms of Use (EULA): 

## Codex4 Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/81/9a/55/819a55a4-7338-501e-19a4-c069fd532401/AppStore1.png/1290x2796.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/61/eb/6f/61eb6f00-5ace-5b40-3056-17be34d59e8d/AppStore2.png/1290x2796.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/45/68/c7/4568c714-c7fe-2e39-b793-0a4cd54f77ac/AppStore3.png/1290x2796.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/af/d4/5c/afd45c5c-6ff1-213b-813b-70a15842a169/AppStore4.png/1290x2796.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/5a/82/90/5a82902e-b42d-1e53-d60a-a62649126436/AppStore5.png/1290x2796.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c2/33/3d/c2333d77-8ef0-acbe-3b95-50392802620b/AppStore6.png/1290x2796.png)

## Codex4 Rating Breakdown in Belgium
- 5 stars: 0 (0%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 2 (100%)

## Codex4 Reviews in Belgium

### *---- "Очень низкий уровень"
Предлагаются слова самого примитивного уровня, но понять это я смог только когда уже заплатил за месяц. Полная ерунда
-- Fedor Krasheninnikov, 2025-12-07

[View all Codex4 reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Codex4 In-App Purchases
| Item | Price |
|------|-------|
| Pro Yearly | €100.00 |
| Pro | €17.00 |
| Basic | €14.99 |
| Basic Yearly | €99.00 |

## Codex4 Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Grossing | Poland | Education | #73 |


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## Codex4 Available In
- [United States](https://apptail.io/app/codex4-for-serious-study-UOxw/united-states)
- [Belgium](https://apptail.io/app/codex4-for-serious-study-UOxw/belgium)
- [Belarus](https://apptail.io/app/codex4-for-serious-study-UOxw/belarus)
- [Netherlands](https://apptail.io/app/codex4-for-serious-study-UOxw/netherlands)
- [Colombia](https://apptail.io/app/codex4-for-serious-study-UOxw/colombia)
- [Russia](https://apptail.io/app/codex4-for-serious-study-UOxw/russia)
- [Saudi Arabia](https://apptail.io/app/codex4-for-serious-study-UOxw/saudi-arabia)
- [Czechia](https://apptail.io/app/codex4-for-serious-study-UOxw/czechia)
- [Indonesia](https://apptail.io/app/codex4-for-serious-study-UOxw/indonesia)
- [Germany](https://apptail.io/app/codex4-for-serious-study-UOxw/germany)
- [United Arab Emirates](https://apptail.io/app/codex4-for-serious-study-UOxw/united-arab-emirates)
- [Poland](https://apptail.io/app/codex4-for-serious-study-UOxw/poland)
- [Cyprus](https://apptail.io/app/codex4-for-serious-study-UOxw/cyprus)
- [Denmark](https://apptail.io/app/codex4-for-serious-study-UOxw/denmark)
- [Dominican Republic](https://apptail.io/app/codex4-for-serious-study-UOxw/dominican-republic)
- [Spain](https://apptail.io/app/codex4-for-serious-study-UOxw/spain)
- [Finland](https://apptail.io/app/codex4-for-serious-study-UOxw/finland)
- [United Kingdom](https://apptail.io/app/codex4-for-serious-study-UOxw/united-kingdom)
- [Grenada](https://apptail.io/app/codex4-for-serious-study-UOxw/grenada)
- [Greece](https://apptail.io/app/codex4-for-serious-study-UOxw/greece)
- [Croatia](https://apptail.io/app/codex4-for-serious-study-UOxw/croatia)
- [Hungary](https://apptail.io/app/codex4-for-serious-study-UOxw/hungary)
- [Israel](https://apptail.io/app/codex4-for-serious-study-UOxw/israel)
- [India](https://apptail.io/app/codex4-for-serious-study-UOxw/india)
- [Iceland](https://apptail.io/app/codex4-for-serious-study-UOxw/iceland)
- [Jamaica](https://apptail.io/app/codex4-for-serious-study-UOxw/jamaica)
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- [Kazakhstan](https://apptail.io/app/codex4-for-serious-study-UOxw/kazakhstan)
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- [Madagascar](https://apptail.io/app/codex4-for-serious-study-UOxw/madagascar)
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- [Nepal](https://apptail.io/app/codex4-for-serious-study-UOxw/nepal)
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- [Philippines](https://apptail.io/app/codex4-for-serious-study-UOxw/philippines)
- [Pakistan](https://apptail.io/app/codex4-for-serious-study-UOxw/pakistan)
- [Portugal](https://apptail.io/app/codex4-for-serious-study-UOxw/portugal)
- [Paraguay](https://apptail.io/app/codex4-for-serious-study-UOxw/paraguay)
- [Qatar](https://apptail.io/app/codex4-for-serious-study-UOxw/qatar)
- [Romania](https://apptail.io/app/codex4-for-serious-study-UOxw/romania)
- [Sweden](https://apptail.io/app/codex4-for-serious-study-UOxw/sweden)
- [Singapore](https://apptail.io/app/codex4-for-serious-study-UOxw/singapore)
- [Slovenia](https://apptail.io/app/codex4-for-serious-study-UOxw/slovenia)
- [Senegal](https://apptail.io/app/codex4-for-serious-study-UOxw/senegal)
- [Suriname](https://apptail.io/app/codex4-for-serious-study-UOxw/suriname)
- [Thailand](https://apptail.io/app/codex4-for-serious-study-UOxw/thailand)
- [Tunisia](https://apptail.io/app/codex4-for-serious-study-UOxw/tunisia)
- [Ukraine](https://apptail.io/app/codex4-for-serious-study-UOxw/ukraine)
- [Uruguay](https://apptail.io/app/codex4-for-serious-study-UOxw/uruguay)
- [Uzbekistan](https://apptail.io/app/codex4-for-serious-study-UOxw/uzbekistan)
- [Venezuela](https://apptail.io/app/codex4-for-serious-study-UOxw/venezuela)
- [Vietnam](https://apptail.io/app/codex4-for-serious-study-UOxw/vietnam)
- [South Africa](https://apptail.io/app/codex4-for-serious-study-UOxw/south-africa)
- [Angola](https://apptail.io/app/codex4-for-serious-study-UOxw/angola)
- [Argentina](https://apptail.io/app/codex4-for-serious-study-UOxw/argentina)
- [Austria](https://apptail.io/app/codex4-for-serious-study-UOxw/austria)
- [Australia](https://apptail.io/app/codex4-for-serious-study-UOxw/australia)
- [Azerbaijan](https://apptail.io/app/codex4-for-serious-study-UOxw/azerbaijan)
- [Barbados](https://apptail.io/app/codex4-for-serious-study-UOxw/barbados)
- [Bermuda](https://apptail.io/app/codex4-for-serious-study-UOxw/bermuda)
- [Bolivia](https://apptail.io/app/codex4-for-serious-study-UOxw/bolivia)
- [Brazil](https://apptail.io/app/codex4-for-serious-study-UOxw/brazil)
- [Canada](https://apptail.io/app/codex4-for-serious-study-UOxw/canada)
- [Chile](https://apptail.io/app/codex4-for-serious-study-UOxw/chile)

---

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