Comparison

DejaVocab vs INYU

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

INYU

This app offers an immersive language learning experience powered by AI. It focuses on communication and understanding through real-time expression refinement and personalized quizzes. Engage in deep discussions, create stories, and build your personal expression bank.

Highlights
  • AI-powered language learning
  • Immersive communication space
  • Real-time expression refinement
  • Personal expression bank
  • Interactive quizzes
  • Storytelling and discussion modules
Features
Read full description

INYU is dedicated to creating an immersive foreign-language space for you. Here, language learning does not begin with vocabulary and grammar—it becomes part of everyday life. A passing question, a quick note, a simulated scenario or role-play, even a deeper conversation with yourself: each can become a natural opportunity to practise a foreign language. Built around this idea, INYU brings together four modules: 1. Surlume: Everyday questions and ideas that surface in the moment become a starting point for encountering and using a foreign language. 2. Sublume: Engage in deeper conversations with AI, expressing your thoughts, ideas, and feelings in a foreign language—or simply talking about anything that interests you. Your words are met with a response, allowing each conversation to naturally become language practice and growth. 3. Theatre: Experience the joy of communicating and creating in a foreign language through simulated scenarios and role-play. 4. Alchemy: Turn the expressions you collect along the way into your own language library, then reinforce them through practice until they become a natural part of your language ability. [Contact & Feedback] • Email: feedback@inyu.space • Official WeChat: INYU_Official • Discord: https://discord.gg/AvxY6kEYq9 Privacy Policy: http://inyu.space/privacy.html Terms of Use: http://inyu.space/legal.html

Screenshots

DejaVocab4 screens
INYU4 screens

Verdict

The call

The clearest difference is rating: DejaVocab at 4.6 against INYU's 4.0. DejaVocab also leads on ratings volume (61 vs 3). INYU's advantage is monetization model (free vs freemium) and update cadence (every 3 days vs weekly). On price, ads, in-app purchases and device support 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 INYU sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

DejaVocab holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: DejaVocab has 61 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

DejaVocab ships an update weekly, INYU every 3 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
DejaVocab versus INYU: the parameters behind the verdict, then further details
ParameterDejaVocabINYU
PriceFreeFree
Rating4.6 (61 ratings) — better4.0 (3 ratings)
Positive reviews86.6% of reviews—
Number of ratings61 — better3
Update frequencyWeeklyEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.613.0 — better
Further details — not scored
Size360 MB92 MB
Age rating17+4+
Developer灏 龙筠尧 吴

Customer experience

DejaVocab

All ratings59 ratings
Positive86.4%
Neutral1.7%
Negative11.9%
Written reviews67 reviews
Positive86.6%
Neutral4.5%
Negative9.0%

INYU

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

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
4 purchases

INYU

Subscriptions4
  • INYU GLOW Monthly1 Month trial$9.991 Month
  • INYU DAWN Monthly1 Month trial$19.991 Month
  • INYU GLOW Annual14 Days trial$79.991 Year
Show 1 more
  • INYU DAWN Annual14 Days trial$159.991 Year

Questions

Is DejaVocab free?
DejaVocab is free to download, with in-app purchases available.
Is INYU free?
INYU is free to download, with in-app purchases available.
Which has better reviews, DejaVocab or INYU?
DejaVocab is rated higher. DejaVocab averages 4.6 out of 5 from 61 ratings, while INYU averages 4.0 from 3 ratings.
Do DejaVocab or INYU have ads?
Neither DejaVocab nor INYU shows ads.
Which is updated more often, DejaVocab or INYU?
DejaVocab ships an update weekly, and INYU every 3 days. Most recently, DejaVocab was updated on October 30, 2026 and INYU on October 31, 2026.

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