Comparison

DejaVocab vs HelloWord

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

HelloWord

This app helps you learn vocabulary on your Apple Watch, even offline. It offers instant pronunciation, example sentences, and quick word switching with gestures. It's designed for independent use without needing your iPhone nearby.

Highlights
  • Independent Apple Watch operation
  • Offline pronunciation
  • Example sentence viewing
  • Gesture-based word switching
  • Supports iPhone and iPad
Features
Read full description

专为 Apple Watch 设计,离线刷词,即时发音。 核心功能 - 独立运行:无需 iPhone,手表端独立使用 - 离线发音:点击音标,即刻朗读,无需联网 - 例句查看:轻触底部箭头,展开例句 - 手势切换:双指捏合,快速切词 联系作者 邮箱:toliuxuan@icloud.com 小红书:@轩爱写代码 隐私条款 使用条款: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ 隐私政策: https://daxuan90.github.io/helloword-privacy/ 致谢 Icons: OpenMoji (CC BY-SA 4.0)

Screenshots

DejaVocab4 screens
HelloWord3 screens

Verdict

The call

DejaVocab and HelloWord are too close to call on the numbers: across 8 compared parameters — price, review sentiment, update cadence and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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 HelloWord sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

DejaVocab ships an update weekly, HelloWord every 9 days. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

ScorecardNo meaningful differences
DejaVocab versus HelloWord: the parameters behind the verdict, then further details
ParameterDejaVocabHelloWord
PriceFreeFree
Rating4.6 (52 ratings) — better—
Positive reviews85.5% of reviews — better82.6% of reviews
Number of ratings52 — better—
Update frequencyWeekly — betterEvery 9 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS17.6 — better18.0
Further details — not scored
Size292 MB40 MB
Age rating17+12+
Developer灏 龙轩 刘

Customer experience

DejaVocab

All ratings52 ratings
Positive88.5%
Neutral1.9%
Negative9.6%
Written reviews62 reviews
Positive85.5%
Neutral4.8%
Negative9.7%

HelloWord

Written reviews23 reviews
Positive82.6%
Neutral13.0%
Negative4.3%

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

HelloWord

Subscriptions2
  • Word+ 月度会员$0.991 Month
  • Word+ 年度会员7 Days trial$7.991 Year

Questions

Is DejaVocab free?
DejaVocab is free to download, with in-app purchases available.
Is HelloWord free?
HelloWord is free to download, with in-app purchases available.
Do DejaVocab or HelloWord have ads?
Neither DejaVocab nor HelloWord shows ads.
Which is updated more often, DejaVocab or HelloWord?
DejaVocab ships an update weekly, and HelloWord every 9 days. Most recently, DejaVocab was updated on September 24, 2026 and HelloWord on September 21, 2026.

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