# U vs 단어장 비비디(Vividy)

The clearest difference is update cadence: 단어장 비비디(Vividy) at weekly against U's every 6 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

U ships an update every 6 months, 단어장 비비디(Vividy) weekly. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | U | 단어장 비비디(Vividy) |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 55 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MIN HO KIM](https://appshunter.io/developer/582570599) | [Yechan Joo](https://appshunter.io/developer/1891250176) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-class-cast/id1491457129)

**Features:** macOS Compatibility

**In-app purchases:** none


### 단어장 비비디(Vividy)

[App page](https://appshunter.io/ios/app/vividy/id6761746672)

This app helps you create and manage vocabulary lists through a 5-stage learning system. It utilizes a spaced repetition algorithm to schedule reviews, ensuring words are revisited before they are forgotten. Focus on studying only the words you need to learn, maximizing efficiency and retention.

**Highlights:** 5-stage word management system, Spaced repetition review scheduling, Automatic selection of words for study, Adaptive learning based on test results, Efficient vocabulary memorization

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

**In-app purchases:** none


## Frequently asked questions

### Is U free?

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

### Is 단어장 비비디(Vividy) free?

단어장 비비디(Vividy) is free to download, with no in-app purchases.

### Do U or 단어장 비비디(Vividy) have ads?

Neither U nor 단어장 비비디(Vividy) shows ads.

### Which is updated more often, U or 단어장 비비디(Vividy)?

U ships an update every 6 months, and 단어장 비비디(Vividy) weekly. Most recently, U was updated on October 5, 2026 and 단어장 비비디(Vividy) on October 1, 2026.

---

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