# Codex4 vs Viobean

Codex4 and Viobean both sit at 5.0 stars, but that hides the real split: 100% of Viobean's written reviews are positive against 50% of Codex4's. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Codex4 sells 4 in-app purchases, starting at $12.99 per month and Viobean sells 7 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Codex4 against 5.0 for Viobean. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews are what separate them: 50% of Codex4's written reviews are positive against 100% of Viobean's.

Codex4 ships an update every 4 days, Viobean weekly. The most recent releases landed on October 21, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Codex4 | Viobean |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/codex4-for-serious-study/id6743228019/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/viobean-german-exam-prep/id6760680646/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | Freemium | Freemium |
| Size | 52 MB | 65 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jonas Richner](https://appshunter.io/developer/1801973188) | [Viobean](https://appshunter.io/developer/1885699885) |

## 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 |


### Viobean

[App page](https://appshunter.io/ios/app/viobean-german-exam-prep/id6760680646)

Prepare for German language exams with AI-powered practice that mirrors the official test format. Get instant feedback on speaking and writing, with detailed grammar explanations in your native language.

**Highlights:** AI-powered exam simulation, Practice all four language skills, AI evaluation for writing, AI speaking partner for oral exams, Grammar explanations in 24 languages, Progress tracking, telc B1 & B2 exam focus

**Features:** Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Viobean Pro Monthly | $14.99 | per month |
| Viobean Pro Max Monthly | $24.99 | per month |
| Viobean Pro 3 months | $34.99 | per 3 months |
| Viobean Pro Max 3 months | $59.99 | per 3 months |
| Viobean Pro Annual | $119.99 | per year |
| Viobean Pro Max Annual | $199.99 | per year |
| 100 extra credits | $10.00 | one-time |


## Frequently asked questions

### Is Codex4 free?

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

### Is Viobean free?

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

### Which has better reviews, Codex4 or Viobean?

Codex4 and Viobean are both rated 5.0 out of 5 on the App Store, from 2 and 3 ratings respectively.

### Do Codex4 or Viobean have ads?

Neither Codex4 nor Viobean shows ads.

### Which is updated more often, Codex4 or Viobean?

Codex4 ships an update every 4 days, and Viobean weekly. Most recently, Codex4 was updated on October 21, 2026 and Viobean on October 28, 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.*