# DejaVocab vs Castlingo

The clearest difference is review sentiment: DejaVocab at 87% against Castlingo's 50%. DejaVocab also leads on ads (none vs shown) and rating (4.6 vs 4.3). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. DejaVocab sells 6 in-app purchases, starting at $5.99 per month and Castlingo sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

DejaVocab holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: DejaVocab has 64 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 87% of DejaVocab's written reviews are positive against 50% of Castlingo's.

DejaVocab ships an update weekly, Castlingo every 4 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | DejaVocab | Castlingo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (64 ratings)](https://appshunter.io/ios/app/dejavocab/id6753130604/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/castlingo/id6762072277/reviews) |
| Number of ratings | **64** | 3 |
| Positive reviews | **86.6% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Freemium | Freemium |
| Size | 360 MB | 30 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [灏 龙](https://appshunter.io/developer/1842626848) | [支涛 黄](https://appshunter.io/developer/1891134742) |

## What reviewers say

### 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 |


### Castlingo

[App page](https://appshunter.io/ios/app/castlingo/id6762072277)

Learn English through engaging YouTube videos and AI-generated podcasts with meticulously crafted bilingual subtitles. Practice pronunciation, build vocabulary with interactive games, and master sentence structures for natural language acquisition.

**Highlights:** Bilingual subtitles with word-level karaoke, AI-generated daily podcasts with 5-pass listening method, Interactive vocabulary games, Sentence structure explanations, Global search for videos and podcasts, Offline audio playback

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Castlingo Pro (Monthly) | $12.99 | per month |
| Castlingo Pro (Yearly) | $99.99 | per year |


## Frequently asked questions

### Is DejaVocab free?

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

### Is Castlingo free?

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

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

DejaVocab is rated higher. DejaVocab averages 4.6 out of 5 from 64 ratings, while Castlingo averages 4.3 from 3 ratings.

### Do DejaVocab or Castlingo have ads?

Castlingo shows ads; DejaVocab does not.

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

DejaVocab ships an update weekly, and Castlingo every 4 days. Most recently, DejaVocab was updated on November 5, 2026 and Castlingo on October 31, 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.*