Comparison

DejaVocab vs LetSpeak

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DejaVocab

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
Read full description

Deja 从一个问题开始: 语言,为什么总是被学成抽象的单词? 在真实世界中,语言来自视频、播客、阅读和声音。 Deja 将这些语境中的表达自动提取、组织,逐渐形成一个属于自己的语料系统。 复习不再是孤立的记忆,而是回到语言第一次出现的那个语境。 阅读、听力、学习不再分离,所有输入汇聚成一条连续的语言路径。 Deja 不属于某一种格式或平台,它试图构建的,是一个会随着使用不断生长的语言系统。 Deja starts with a simple idea: Language is not learned from isolated words, but from real usage. Import videos, podcasts, books, or any text. Deja automatically captures phrases in context and turns scattered exposure into a growing personal corpus. Review is not repetition. It is a return to the moment where the language first made sense. Reading, listening, and studying are no longer separated. Everything flows into one continuous system, one evolving memory. Deja is not about formats or platforms. It is about building a language system that grows with you. Contact WeChat: longhao1596 Discord Community: https://discord.gg/AC7sNMJW Privacy Policy: https://dejavocab.com/privacy-policy/ Subscription Information Subscriptions renew automatically 24 hours before the end of the current period You can manage or cancel your subscription in Apple ID settings at any time After cancellation, access remains until the end of the current subscription period Payment will be charged to your iTunes account upon confirmation of purchase Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Don’t let words slip past unnoticed. Let DejaVocab capture every meaningful chunk of language. Download DejaVocab and build your own language corpus.

About

LetSpeak

Practice spoken English through AI-powered conversations. Start with Chinese or mixed language and gradually transition to natural English. Receive feedback on pronunciation, grammar, and vocabulary in realistic scenarios.

Highlights
  • AI-powered spoken English practice
  • Mixed language input (Chinese/English)
  • Scenario-based conversations
  • Pronunciation and grammar feedback
  • Vocabulary building
  • Confidence building
Features
Read full description

Practice real spoken English with LetSpeak. LetSpeak is an AI English speaking teacher designed for Chinese learners. You do not need to speak perfect English from the start. You can start with Chinese, mix Chinese and English, and slowly learn how to say your ideas in natural English. Talk to LetSpeak like you are talking to a patient teacher. Want to order coffee, travel abroad, speak at work, answer questions in class, or talk about your hobbies and daily life? You can say your ideas in Chinese first, or mix Chinese and English. LetSpeak will understand what you mean, guide you step by step, and help you turn your thoughts into clear English. LetSpeak is not just free chat, and it is not just sentence memorization. Each lesson has a clear scene and goal. The AI teacher teaches you one useful sentence, helps you practice it, and then guides you to use it in a real conversation. Through repeated speaking practice, you can build useful expressions, improve pronunciation, grammar, vocabulary, and speaking confidence. How to use LetSpeak: 1. Choose a scene you want to practice, such as daily life, study, work, or travel. 2. Start speaking with your AI teacher. If you do not know how to say it in English, you can start in Chinese. 3. LetSpeak will ask follow-up questions and guide you to keep speaking. 4. After each answer, you get feedback on pronunciation, grammar, word choice, and more natural expressions. 5. Turn incorrect sentences into usable English, then say them again in the next conversation. 6. Build long-term confidence through real speaking practice. Start practicing English speaking with LetSpeak today. Stop only reading English without speaking it. Stop worrying about mistakes or having no one to correct you. LetSpeak helps you start with your first sentence and slowly speak clearer, more natural, and more useful English. Privacy Policy:https://www.letspeakapp.com/privacy/ Terms of Use (EULA):https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

DejaVocab4 screens
LetSpeak4 screens

Verdict

The call

The clearest difference is rating: LetSpeak at 5.0 against DejaVocab's 4.5. LetSpeak also leads on monetization model (free vs freemium) and iOS requirement (13.0 vs 17.6). DejaVocab's advantage is ratings volume (59 vs 1). On price, review sentiment, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. DejaVocab sells 6 in-app purchases, starting at $5.99 per month and LetSpeak sells 5 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

LetSpeak holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: DejaVocab has 59 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 86% of DejaVocab's written reviews are positive against 91% of LetSpeak's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 15, 2026 and October 12, 2026 respectively.

Scorecard4 real differences · 6 level
DejaVocab versus LetSpeak: the parameters behind the verdict, then further details
ParameterDejaVocabLetSpeak
PriceFreeFree
Rating4.5 (59 ratings)5.0 (1 ratings) — better
Positive reviews86.4% of reviews91.2% of reviews — better
Number of ratings59 — better1
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.613.0 — better
Further details — not scored
Size360 MB61 MB
Age rating17+4+
Developer灏 龙Beijing LingoQ Technology Co., Ltd.

Customer experience

DejaVocab

All ratings59 ratings
Positive86.4%
Neutral1.7%
Negative11.9%
Written reviews66 reviews
Positive86.4%
Neutral4.5%
Negative9.1%

LetSpeak

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews34 reviews
Positive91.2%
Neutral2.9%
Negative5.9%

In-app purchases

6 purchases

DejaVocab

Subscriptions4
  • DejaVocab 高级版3 Days trial$5.991 Month
  • DejaVocab 高级版3 Days trial$7.991 Month
  • DejaVocab 高级版年付7 Days trial$49.991 Year
Show 1 more
  • DejaVocab 专业版年付7 Days trial$69.991 Year
One-time2
  • DejaVocab 共建者$199.99
  • DejaVocab 共建者 Plus$299.99
5 purchases

LetSpeak

Subscriptions5
  • Monthly Subscription$14.991 Month
  • Quarterly Subscription$39.993 Months
  • Annual Subscription7 Days trial$59.991 Year
Show 2 more
  • Annual Subscription3 Days trial$59.991 Year
  • Annual Subscription$59.991 Year

Questions

Is DejaVocab free?
DejaVocab is free to download, with in-app purchases available.
Is LetSpeak free?
LetSpeak is free to download, with in-app purchases available.
Which has better reviews, DejaVocab or LetSpeak?
LetSpeak is rated higher. DejaVocab averages 4.5 out of 5 from 59 ratings, while LetSpeak averages 5.0 from 1 ratings.
Do DejaVocab or LetSpeak have ads?
Neither DejaVocab nor LetSpeak shows ads.
Which is updated more often, DejaVocab or LetSpeak?
DejaVocab ships an update weekly, and LetSpeak weekly. Most recently, DejaVocab was updated on October 15, 2026 and LetSpeak on October 12, 2026.

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