# Dejavocab > This intelligent video learning assistant uses AI technology to extract subtitles and manage vocabulary, making language learning more efficient. It supports platforms like YouTube and Bilibili, creating a personalized learning experience. Canonical page: [https://chrome-stats.com/d/com.dejavocab.android](https://chrome-stats.com/d/com.dejavocab.android) ## Overview - **ID:** `com.dejavocab.android` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** Lilwhite inc. - **Category:** EDUCATION - **Downloads:** 9,746 - **Rating:** 5.00 / 5 (36 ratings) - **Version:** 1.5.17 - **Last updated:** 2026-09-04 - **First published:** 2026-01-07 - **Publisher country:** CA - **Size:** 71 MB - **Data as of:** 2026-09-12 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.dejavocab.android) - **Website:** [https://dejavocab.com](https://dejavocab.com/) - **Privacy policy:** [https://dejavocab.com/privacy-policy/](https://dejavocab.com/privacy-policy/) ## Description DejaVocab - An English learning tool that captures every word and phrase.

It's not just about learning English through videos; it's about turning every word, phrase, and sentence in the video into learning material.

Watch a video once, and you'll build a lifetime of vocabulary.

Core Concept

Traditional Method: Memorizing Words in Books - Out of Context - Impossible to Remember
DejaVocab: Real Videos - Full Context - Permanent Memory

For each word, we know:
- Which video it appears in
- In what sentence
- The context
- The speaker's tone

Every phrase is tracked:
- AI automatically identifies authentic phrases
- Records all occurrences
- Compares different usages

Every sentence is saved:
- Save key phrases with one click
- Return to the original video at any time
- Accurately tracked down to the second

This is true "immersive learning"

[Words Are No Longer Isolated]

Click any word in the video subtitles:
- See sentences where this word appears in all the videos you've watched
- Compare usages in different contexts
- Build a "memory network" of the word

For example, the word "run":
- In fitness videos, it's "跑"
- In business videos, it's "操作"
- In technology videos, it's "跑"
DejaVocab helps you memorize all these usages!

[AI Phrase Discovery]
You don't search for phrases; AI finds them for you:
- Automatically identifies common collocations in videos
- "give up," "look forward to," "break down"
- Categorizes phrases by video and sorts them by frequency of use
- Each phrase has a real-world usage scenario

[Instant Sentence Collection]
Stumble upon a good sentence? One-click saving:
- Automatically records video, time, and context
- Generates AI translations
- Search function: Enter Chinese characters to find English sentences
- Click on a sentence to jump directly to that second in the video

Exclusive Features

[Language Chunk Tracking System]
Your own English database:
- Watch 50 videos = accumulate 5,000+ word contexts
- Each word has a "personal profile"
- Look up any word: Instantly see where you've encountered it

[Scrolling Translation]
Understand as you watch, immersive experience:
- Automatic subtitle translation, displayed in real time
- Option to show/hide translations
- AI grammatical analysis: Understands sentence structure

[Smart Player]
Optimized player for language learning:
- Sentence loop: Listen to sentences you don't understand repeatedly
- Listening mode: Hide subtitles to test comprehension
- 0.5x-2.0x speed adjustment: Adapts to your pace
- Picture-in-picture: Take notes while watching

[Deja Smart Definition]
Not a dictionary, but an AI teacher:
- Explains complex words in simple terms
- Personalized explanations based on video context
- Examples are from videos you've watched

Visualize learning outcomes

- How many new words have you learned today
- Which words appear most frequently
- How large is your vocabulary network
- How many phrases have been mined from videos

Who needs DejaVocab?

- Those who don't want to memorize vocabulary books - Learn with real content
- Those who have watched a lot of videos but haven't accumulated enough - Now you can track every word
- Those who want to build "English intuition" - Learn through a wealth of context
- Those who find traditional methods too boring - Learn with content you enjoy

User Reviews

"Finally, I don't have to memorize vocabulary books anymore!"

"Watching American TV series is finally useful; I can track every word."

"The phrase AI is amazing; it automatically helps me find authentic expressions."

"This is what it means to truly learn English by watching videos."

Contact Information

WeChat: longhao1596
Privacy Policy: https://dejavocab.com/privacy-policy/

Subscription Information

- Subscription automatically renews 24 hours before expiration
- Cancel at any time in your Apple ID settings
- Subscription ends at the end of the current period after cancellation
- Payment will be charged to your iTunes account at confirmation of purchase

Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Don't let words slip away from you. Let DejaVocab help you capture every word!

Download DejaVocab and build your English corpus ## Rankings - #570,309 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_ADSERVICES_AD_ID` - `android.permission.ACCESS_ADSERVICES_ATTRIBUTION` - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.ACCESS_WIFI_STATE` - `android.permission.CAMERA` - `android.permission.FOREGROUND_SERVICE` - `android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK` - `android.permission.INTERNET` - `android.permission.MODIFY_AUDIO_SETTINGS` - `android.permission.POST_NOTIFICATIONS` - `android.permission.RECEIVE_BOOT_COMPLETED` - `android.permission.RECORD_AUDIO` - `android.permission.WAKE_LOCK` - `com.android.vending.BILLING` - `com.android.vending.CHECK_LICENSE` - `com.dejavocab.android.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` - `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE` - `com.google.android.gms.permission.AD_ID` ## Similar extensions and apps - [VocabNote: Learn Vocabulary](https://chrome-stats.com/d/com.phinguyen.vocabnote) — 115 users - [MYVOCA - Smart Learning](https://chrome-stats.com/d/net.royfactory.adshare) — 59 users - [LingoTail: English Flashcards](https://chrome-stats.com/d/com.lingotail.app) — 945 users - [Vidvocab: Real English with AI](https://chrome-stats.com/d/com.phan.vidvocab) — 77 users - [TikWord](https://chrome-stats.com/d/com.tickword.app) — 15 users - [VocabSphere - AI + English](https://chrome-stats.com/d/com.vocabsphere.app) — 739 users - [A-Dictionary: AI Vocab Builder](https://chrome-stats.com/d/com.cleartech.adictionary) — 36,684 users - [VoiceTube Dictionary](https://chrome-stats.com/d/org.redidea.dict) — 1,260,297 users, 4.07 / 5 - [VocaBuilderAi](https://chrome-stats.com/d/com.Education.VocaBuilderAI) — 62 users - [Deep Vocab: Essential](https://chrome-stats.com/d/com.unisa.deepvocab) — 562 users - [langTube - Learn with AI](https://chrome-stats.com/d/com.freude.freudeapp) — 27,930 users, 2.20 / 5 - [AI Vocabulary](https://chrome-stats.com/d/com.cia1099.ai_vocabulary) — 48 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.dejavocab.android)