# Codex4 vs YBZ Academy

Codex4 and YBZ Academy both sit at 5.0 stars, but that hides the real split: 100% of YBZ Academy's written reviews are positive against 50% of Codex4's. YBZ Academy also leads on in-app purchases (none vs 4) and iOS requirement (13.4 vs 15.6). Codex4's advantage is update cadence (every 4 days vs every 5 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Codex4 sells 4 in-app purchases, starting at $12.99 per month. YBZ Academy asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Codex4 against 5.0 for YBZ Academy. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews are what separate them: 50% of Codex4's written reviews are positive against 100% of YBZ Academy's.

Codex4 ships an update every 4 days, YBZ Academy every 5 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Codex4 | YBZ Academy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/codex4-for-serious-study/id6743228019/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/ybz-academy/id6743738966/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 months |
| Monetization | Freemium | **Free** |
| Size | 52 MB | 28 MB |
| Requires iOS | 15.6 | **13.4** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Jonas Richner](https://appshunter.io/developer/1801973188) | [YOYO BY ZAQ LLC](https://appshunter.io/developer/1804290727) |

## What reviewers say

### Codex4

[App page](https://appshunter.io/ios/app/codex4-for-serious-study/id6743228019)

Build a usable vocabulary for your job, studies, or hobbies with smart, spaced repetition reviews. Master real word usage and track your progress with clear statistics. Designed for serious learners with a clean interface and no gimmicks.

**Highlights:** Add custom words from any text, Spaced repetition reviews (FSRS), Master word lemmas and conjugations, Clear progress statistics, Automatic word extraction, Data export and offline access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $12.99 | per month |
| Pro | $14.00 | per month |
| Basic Yearly | $69.99 | per year |
| Pro Yearly | $85.00 | per year |


### YBZ Academy

[App page](https://appshunter.io/ios/app/ybz-academy/id6743738966)

This app provides a structured learning experience with AI-powered tools to enhance your educational journey. Access video lessons, track your progress, and engage with an AI tutor for personalized guidance. Enroll in diverse courses to acquire new knowledge or sharpen existing skills.

**Highlights:** AI-powered learning tools, Structured courses with video lessons, Progress tracking, AI tutor voice, AI course question suggestions, Course rating system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Codex4 free?

Codex4 is free to download, with in-app purchases available.

### Is YBZ Academy free?

YBZ Academy is free to download, with no in-app purchases.

### Which has better reviews, Codex4 or YBZ Academy?

Codex4 and YBZ Academy are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Codex4 or YBZ Academy have ads?

Neither Codex4 nor YBZ Academy shows ads.

### Which is updated more often, Codex4 or YBZ Academy?

Codex4 ships an update every 4 days, and YBZ Academy every 5 months. Most recently, Codex4 was updated on October 21, 2026 and YBZ Academy on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*