OneBook vs Yidou Words
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OneBook
This app offers a comprehensive language learning experience by integrating audiobooks, podcasts, and videos. It features AI-powered tools for instant text explanations, word lookup, and subtitle generation, supporting over 60 languages.
- AI Instant Tutor for text explanations
- Automatic subtitle generation for audiobooks
- Real-person narration for eBooks
- Interactive PDF audio books
- Efficient word and sentence lookup
- Vocabulary level highlighting
- Multiple reading modes
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OneBook is a multilingual learning hub for shadowing audiobooks, podcasts, and videos—with AI context lookup while you read and listen. Core Features 【Audiobook Deep Learning】 【Exclusive Subtitle Generation】: First to support auto-generating synchronized subtitles for m4b/Audible audiobooks. Millions of Audible titles become readable and learnable. 【Real-Person Narration for eBooks】: Supports epub3 books narrated by real people (not synthetic TTS), enabling synchronized listening and reading. 【Interactive PDF Audio Books】: Tap on text within PDF picture books to play the corresponding audio, creating an interactive read-along experience. 【Intelligent Reading & Lookup】 【Efficient Word & Sentence Lookup】: Tap to look up a word, long-press to look up a sentence. Incorporates a feature similar to Kindle's Word Wise, significantly reducing lookup effort. 【AI Instant Tutor】: Select any text for instant AI explanations on grammar, context, sentence structure, and more—like having a personal teacher on hand. 【Vocabulary Level Highlighting】: Words are automatically color-coded based on difficulty, making key terms stand out at a glance. 【Multi-Mode Immersive Experience】 【Multiple Reading Modes】: Includes ADHD Bionic Reading, Cinematically-Scrolling, Immersive Focus Mode, Background Music Reading, Shadowing Practice, and more to suit different scenarios. 【Whisper-Style Audiobook】: Supports offline listening with optional ambient white noise, crafting a comfortable and focused listening experience. 【All-Platform Resource Integration】 Learn directly from videos and audio on platforms like YouTube, Bilibili, and Apple Podcasts. Supports OPDS catalogs for easy subscription to news, foreign periodicals, and magazines. Import personal resources via WebDAV or cloud storage, with real-time synchronization across multiple devices. 【Multilingual & Customizable】 Supports learning for 60+ global languages, including German, French, Italian, Spanish, and other less-commonly-taught languages. Compatible with importing any MDX dictionary file, allowing you to use your preferred word references. Supports custom AI models to tailor the Q&A experience to your needs. Learning Management & Statistics Pre-study new words before reading, with automatic tracking during your session. Detailed reading statistics and insights to help you track progress and outcomes. Why Choose Us? All in One: A single app integrates audiobooks, reading, video learning, vocabulary management, AI Q&A, and resource syncing. Constantly Evolving: Continuously updated with new features and improvements, with more exciting additions on the way. Welcome to Download and Experience Begin your efficient, immersive, and personalized language learning and reading journey today. Privacy Policy: https://www.onebook2025.top/privacy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Yidou Words
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YidouWords is an intelligent reading and language-learning app that combines AI assistance, audiobook playback, and practical study tools. Import EPUB3, M4B, PDF, text files, and other content. Improve your listening, speaking, reading, and writing through authentic materials with AI translation, contextual analysis, smart vocabulary highlighting, audiobook playback, real-time video subtitles, vocabulary review, and language practice. CORE FEATURES AI-Powered Assistance - Customize your translation, speech, and AI providers - Understand words and sentences in context - Use AI dictionaries, sentence analysis, and grammar explanations - Ask questions anytime and receive detailed, tutor-like explanations Audiobooks and Listening Practice - Supports EPUB3 audio content and M4B audiobooks - Read and listen at the same time to improve comprehension and develop a natural feel for the language - Supports multiple text-to-speech engines - Supports offline voices and high-quality original audiobook recordings - Ideal for intensive listening, shadowing, and speaking practice - AI multi-voice narration for more natural dialogue and character distinction Smart Vocabulary Learning - Look up words and sentences instantly without interrupting your reading - Automatically highlight unfamiliar and important vocabulary - Understand word meanings and usage based on context - Review saved vocabulary to strengthen long-term memory - Analyze sentence structure and components - Explore words, characters, phrases, and paragraphs with in-depth AI analysis - Use bionic reading to improve focus and reading efficiency - Practice with vocabulary review quizzes Immersive Reading and Learning - Import your own books, magazines, articles, and study materials - Display original text and translations together intelligently - Filter and display translations according to your language level - Learn vocabulary and expressions through authentic context - Build comprehensible input from materials that would otherwise feel too difficult Web and Video Learning - Tap words on web pages for instant definitions - Learn directly from online articles and other web content - Generate real-time Chinese subtitles for online videos - Combine video, listening, vocabulary, and contextual learning in one place Learning Progress Track your learning and see your progress over time: - Saved vocabulary - Reading time - Number of items read - Vocabulary learned - New-word accumulation and review progress WHO IS YIDOU FOR? Independent English Learners - Learn English naturally through reading and listening - Use AI assistance to make challenging material easier to understand Advanced English Learners - Improve reading skills with English news, magazines, and original books - Build a stronger sense of natural usage and authentic expression Listening and Vocabulary Learners - Develop listening skills and vocabulary systematically - Work with authentic materials without being discouraged by their difficulty IELTS and TOEFL Learners - Build long-term language exposure and a natural feel for English - Use Yidou as a daily learning and input tool rather than a test-drilling app Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://yidouwords.github.io/yidouwords-privacy/
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Verdict
OneBook and Yidou Words are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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
Both are free to download. OneBook sells 2 in-app purchases, starting at $8.00 per month and Yidou Words sells 5 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Both ship on a similar rhythm, roughly weekly. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.
| Parameter | OneBook | Yidou Words |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (64 ratings) — better | — |
| Positive reviews | 97.3% of reviews | — |
| Number of ratings | 64 — better | — |
| Update frequency | Weekly | Weekly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 224 MB | 156 MB |
| Age rating | 4+ | 17+ |
| Developer | 翊 林 | 艳 常 |
In-app purchases
OneBook
- OneBook Premium Monthly$8.001 Month
- AI Pack 1000$5.00
Yidou Words
- 一兜英语 Pro$0.991 Month
- 300 AI 点数$0.99
- 一兜英语Pro永久版$2.99
- 1000 AI 点数$2.99
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- 3000 AI 点数$4.99








