# OUELO vs Prep Vocab

The clearest difference is ads: OUELO at none against Prep Vocab's shown. Prep Vocab's advantage is update cadence (every 8 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

OUELO ships an update every 3 weeks, Prep Vocab every 8 days. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | OUELO | Prep Vocab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Size | 52 MB | 125 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [HO CHI MINH CITY OPEN UNIVERSITY](https://appshunter.io/developer/1479161594) | [PREP TECHNOLOGY JOINT STOCK COMPANY](https://appshunter.io/developer/1511769498) |

## What reviewers say

### OUELO

[App page](https://appshunter.io/ios/app/ouelo/id6737468740)

**Features:** macOS Compatibility

**In-app purchases:** none


### Prep Vocab

[App page](https://appshunter.io/ios/app/prep-vocab/id6762447531)

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

**In-app purchases:** none


## Frequently asked questions

### Is OUELO free?

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

### Is Prep Vocab free?

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

### Do OUELO or Prep Vocab have ads?

Prep Vocab shows ads; OUELO does not.

### Which is updated more often, OUELO or Prep Vocab?

OUELO ships an update every 3 weeks, and Prep Vocab every 8 days. Most recently, OUELO was updated on October 27, 2026 and Prep Vocab 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.*