Codex4 - For Serious Study is made and published by Jonas Richner. AppBrain is an independent app data site and isn't affiliated with Jonas Richner. The app name, icon, screenshots and description belong to Jonas Richner and are shown as published on the App Store.

About Codex4 - For Serious Study

Codex4 - For Serious Study is an education app developed by Jonas Richner.

User Ratings

Codex4 - For Serious Study is rated 5.00 out of 5 stars. The rating is based on 2 ratings.

App Information

Codex4 - For Serious Study is freely available from the App Store. The app size is 51.99 MB. The latest version available is 3.66. The last update was on April 14, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since May 2025.

Description by Jonas Richner (from the App Store)

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): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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More data about Codex4 - For Serious Study

Price	Free
Rating	5.00 based on 2 ratings
Ranking	Not ranked
Version	3.66
App size	52.0 MB
Suitable for	Everyone

Screenshots

Codex4 - For Serious Study Screenshot 1 of 6

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Screenshots by Jonas Richner, from the the App Store listing

Official page on the App Store Also on Google Play

Also available on Google Play

Codex4

0.0

Free

5,000+

Changelog of Codex4 - For Serious Study

No changelog data

Developer information for Jonas Richner

Jonas Richner

Address:

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Technologies used by Codex4 - For Serious Study

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Codex4 - For Serious Study