# Polyidiom vs DejaVocab

The clearest difference is rating: Polyidiom at 5.0 against DejaVocab's 4.6. Polyidiom also leads on update cadence (every 3 days vs weekly) and review sentiment (100% vs 87%). DejaVocab's advantage is ratings volume (60 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Polyidiom sells 3 in-app purchases, starting at $1.99 per month and DejaVocab sells 6 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Polyidiom holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: DejaVocab has 60 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Polyidiom's written reviews are positive against 87% of DejaVocab's.

Polyidiom ships an update every 3 days, DejaVocab weekly. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Polyidiom | DejaVocab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/polyidiom-learn-idiomslang/id6746371097/reviews)** | [4.6 (60 ratings)](https://appshunter.io/ios/app/dejavocab/id6753130604/reviews) |
| Number of ratings | 1 | **60** |
| Positive reviews | **100.0% of reviews** | 86.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Freemium | Freemium |
| Size | 43 MB | 360 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [亲强 吴](https://appshunter.io/developer/1700348139) | [灏 龙](https://appshunter.io/developer/1842626848) |

## What reviewers say

### Polyidiom

[App page](https://appshunter.io/ios/app/polyidiom-learn-idiomslang/id6746371097)

Master idioms and slang across multiple languages with engaging illustrations and smart learning algorithms. Track your progress, save favorites, and explore cultural backgrounds. Offline access makes learning convenient anytime, anywhere.

**Highlights:** Card-based learning with definitions and history, Detailed explanations of cultural backgrounds, Save favorite idioms for review, Track learning progress and statistics, Support for six languages, Cartoon illustrations for enhanced memory, Offline learning support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PolyIdiom Premium (Monthly) | $1.99 | per month |
| PolyIdiom Premium (Yearly) | $7.99 | per year |
| Polyidiom Lifetime Membership | $9.99 | one-time |


### DejaVocab

[App page](https://appshunter.io/ios/app/dejavocab/id6753130604)

This app helps you learn languages by immersing you in real-world content like videos, podcasts, and books. It builds a personal language corpus by capturing and organizing language chunks from natural input, allowing you to review words within their original context. The system integrates spoken and written language for a continuous learning experience.

**Highlights:** Learn from videos, podcasts, and audiobooks, Build a personal language corpus, Review vocabulary in original context, Integrates spoken and written language, Supports EPUB, PDF, and text files

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DejaVocab 高级版 | $5.99 | per month |
| DejaVocab 高级版 | $7.99 | per month |
| DejaVocab 高级版年付 | $49.99 | per year |
| DejaVocab 专业版年付 | $69.99 | per year |
| DejaVocab 共建者 | $199.99 | one-time |
| DejaVocab 共建者 Plus | $299.99 | one-time |


## Frequently asked questions

### Is Polyidiom free?

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

### Is DejaVocab free?

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

### Which has better reviews, Polyidiom or DejaVocab?

Polyidiom is rated higher. Polyidiom averages 5.0 out of 5 from 1 ratings, while DejaVocab averages 4.6 from 60 ratings.

### Do Polyidiom or DejaVocab have ads?

Neither Polyidiom nor DejaVocab shows ads.

### Which is updated more often, Polyidiom or DejaVocab?

Polyidiom ships an update every 3 days, and DejaVocab weekly. Most recently, Polyidiom was updated on October 8, 2026 and DejaVocab on October 25, 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.*