# DeepEng vs DejaVocab

The clearest difference is review sentiment: DejaVocab at 86% against DeepEng's 60%. DeepEng's advantage is iOS requirement (15.1 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DeepEng sells 2 one-off in-app purchases 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.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | DeepEng | DejaVocab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (59 ratings)](https://appshunter.io/ios/app/dejavocab/id6753130604/reviews)** |
| Number of ratings | — | **59** |
| Positive reviews | 60.0% of reviews | **86.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | Freemium |
| Size | 235 MB | 360 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [成都麦田外科技有限公司](https://appshunter.io/developer/1800915589) | [灏 龙](https://appshunter.io/developer/1842626848) |

## What reviewers say

### DeepEng

[App page](https://appshunter.io/ios/app/deepeng/id6746141434)

This immersive learning tool uses a "language vector space" theory and multimodal neural network training to help beginners acquire English naturally, like a native language. Its "scene-voice-semantics" system enhances learning efficiency.

**Highlights:** Immersive learning approach, Language vector space theory, Multimodal neural network training, Scene-voice-semantics system, Natural language acquisition, Zero-beginner friendly

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5天体验卡 | $7.99 | one-time |
| 365天年卡 | $449.99 | 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 DeepEng free?

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

### Is DejaVocab free?

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

### Do DeepEng or DejaVocab have ads?

Neither DeepEng nor DejaVocab shows ads.

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

DeepEng ships an update weekly, and DejaVocab weekly. Most recently, DeepEng was updated on October 8, 2026 and DejaVocab on October 15, 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.*