Dejavocab

In-app purchases
100+
Downloads
Content rating
Everyone
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About this app

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
Updated on
Jan 8, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
App activity and Device or other IDs
Data is encrypted in transit
You can request that data be deleted

What’s new


1. Added profile avatar management for personalization
2. Added Google Sign-In for easier access
3. Fixed issues with the password reset flow
4. Simplified the email sign-in process
5. Added subscription support to unlock premium features

App support

Phone number
+8617347898191
About the developer
Hao Long
tcytcy111@gmail.com
7 Bishop Ave apt 509 North York, ON M2M 4J4 Canada

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