Comparison

DejaVocab vs Castlingo

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

Castlingo

Learn English through engaging YouTube videos and AI-generated podcasts with meticulously crafted bilingual subtitles. Practice pronunciation, build vocabulary with interactive games, and master sentence structures for natural language acquisition.

Highlights
  • Bilingual subtitles with word-level karaoke
  • AI-generated daily podcasts with 5-pass listening method
  • Interactive vocabulary games
  • Sentence structure explanations
  • Global search for videos and podcasts
  • Offline audio playback
Features
Read full description

Castlingo 把 油管上最好的英语视频按你感兴趣的话题装进口袋 —— 真实的访谈、演讲、播客,带字字精修的双语字幕。看视频学英语,戴上耳机就能开始。 【六大分类,按兴趣看】 不再被算法乱推。我们每天扫描 YouTube 上最值得看的英语内容,按话题分好类: - 娱乐 · 文化:Hot Ones / Vogue / Vanity Fair / WIRED - 两性 · 心理:Matthew Hussey / Jay Shetty / School of Life - 思想 · 访谈:TED / Andrew Huberman / Tim Ferriss / Diary of a CEO - 科普 · 科学:Veritasium / Kurzgesagt / 3Blue1Brown - 创业 · 商业:Y Combinator / Stanford / Acquired - 科技 · 评测:MKBHD 【字字精修的字幕】 - 中英双语字幕,焦点行高亮,跟视频自动滚动 - 词级 karaoke:每个单词在被说出的瞬间亮起,跟读时机精准 - 不认识的词点一下,加入生词本,例句翻译一应俱全(Pro) - 锁屏 / 后台继续听音频,进度永不丢 【AI 每日播客 · 5 遍循环法】 真实视频之外,还有为学习设计的 AI 每日播客。基于"可理解输入"假说,同一段对话听 5 遍: - 英语 3 遍熟悉语感 - 母语翻译 1 遍理解内容 - 英语 1 遍巩固记忆 【词汇小课堂·6 国场景】 美、英、澳等 6 国真实生活场景(银行开户、看医生、点单……)的实用词汇课,配场景插画,点单词即听纯正发音。每一课还能「模拟现场对话」,和虚拟角色一来一往把学到的词用出来。 【句型讲解·227 条地道表达】 每天从播客里提炼母语者张口就来的地道句型:读音跟读、字面意思、什么场景什么情绪该用、3-4 个真实例句,六段式讲透——让你形成语感条件反射,而不是「中译英」。 【练起来,记得牢】 · 词义配对 / 连词成句 / 场景模拟三种小游戏,边玩边练 · 生词自动进词汇本,按遗忘曲线提醒复习 · 连续打卡火苗、成就徽章,坚持有反馈 Castlingo Pro 解锁全部内容: - 完整双语字幕 + 词级 karaoke 跟读 - 点词查词 + 无限保存生词 - 完整 5 遍循环(免费版 4 遍) - 全部句型讲解(免费版每日 1 个) - 无限练习游戏 - 每日无限集数 订阅自动续费,可在 App Store 账户设置中随时取消。 隐私政策:https://amyhuang13506-svg.github.io/LangPod/docs/privacy.html 用户协议:https://amyhuang13506-svg.github.io/LangPod/docs/terms.html

Screenshots

DejaVocab4 screens
Castlingo4 screens

Verdict

The call

The clearest difference is review sentiment: DejaVocab at 87% against Castlingo's 50%. DejaVocab also leads on ads (none vs shown) and rating (4.6 vs 4.3). On price, update cadence, in-app purchases and monetization model 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 Castlingo sells 2 in-app purchases, starting at $12.99 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 4.3. That said, the two scores are not equally well evidenced: DejaVocab has 64 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 87% of DejaVocab's written reviews are positive against 50% of Castlingo's.

UpkeepUpdate frequency

DejaVocab ships an update weekly, Castlingo every 4 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
DejaVocab versus Castlingo: the parameters behind the verdict, then further details
ParameterDejaVocabCastlingo
PriceFreeFree
Rating4.6 (64 ratings) — better4.3 (3 ratings)
Positive reviews86.6% of reviews — better50.0% of reviews
Number of ratings64 — better3
Update frequencyWeeklyEvery 4 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size360 MB30 MB
Age rating17+4+
Developer灏 龙支涛 黄

Customer experience

DejaVocab

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

Castlingo

All ratings3 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews10 reviews
Positive50.0%
Neutral20.0%
Negative30.0%

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
2 purchases

Castlingo

Subscriptions2
  • Castlingo Pro (Monthly)$12.991 Month
  • Castlingo Pro (Yearly)7 Days trial$99.991 Year

Questions

Is DejaVocab free?
DejaVocab is free to download, with in-app purchases available.
Is Castlingo free?
Castlingo is free to download, with in-app purchases available.
Which has better reviews, DejaVocab or Castlingo?
DejaVocab is rated higher. DejaVocab averages 4.6 out of 5 from 64 ratings, while Castlingo averages 4.3 from 3 ratings.
Do DejaVocab or Castlingo have ads?
Castlingo shows ads; DejaVocab does not.
Which is updated more often, DejaVocab or Castlingo?
DejaVocab ships an update weekly, and Castlingo every 4 days. Most recently, DejaVocab was updated on November 5, 2026 and Castlingo on October 31, 2026.

Other comparisons