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集中読書 is a free RSVP speed-reading app for iOS/Android provided by QOOQ, Inc. Using Rapid Serial Visual Presentation, it displays text units one by one in the center of the screen, reducing the eye movement and page-turning burden of traditional reading. The product is focused on Japanese reading, especially fast importing and reading of content from 青空文庫, EPUB, PDF, TXT, web pages, and clipboard text.
From an AI-app perspective, it does not disclose the use of large language models, nor does it offer summarization, Q&A, or text-generation features. Its “smart” component is a Japanese phrase-segmentation engine: designed for Japanese text without spaces, it naturally combines particles and auxiliary verbs with related words, displaying text in more easily understood phrase units. Users can adjust the reading speed between 100–1,000 WPM; pauses are automatically extended at punctuation marks, and the app also supports bookmarks, progress saving, and dark mode.
All core features are free, including RSVP reading, 青空文庫 integration, file import, speed adjustment, and bookmarks. Premium is mainly for removing ads, priced at ¥280/month, ¥2,400/year, or a one-time purchase of ¥2,800. The privacy explanation is fairly clear: imported text, reading progress, bookmarks, and settings are stored locally on the device and are not uploaded to the company’s servers. However, external communications may occur for 青空文庫 downloads, web-page imports, in-app purchases, ad display, and Firebase anonymous analytics.
Its strengths are a low free-entry barrier, clear optimization for Japanese RSVP reading, broad format support, and direct access to more than 10,000 works from 青空文庫. The limitations are also clear: it is more of a reading-efficiency tool than a full AI assistant; DRM-protected Kindle or Amazon ebooks cannot be read directly; speed-reading effectiveness varies by individual; the free version includes ads; and there is no stated optimization for a Chinese interface or Chinese word segmentation.
It is suitable for learners, researchers, commuters, and anyone with large amounts of Japanese material to read, as well as users who want to get through 青空文庫 titles, EPUBs, and PDFs in spare moments. If you mainly read Chinese content, you should first verify the segmentation and display experience, or consider alternatives such as 微信读书, Kindle, and Moon+ Reader. Availability in mainland China is not discussed in the main materials; App Store/Google Play downloads, in-app purchases, and ad services may be affected by account, network, and platform conditions in China.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on sokudoku.net official site.
sokudoku.net is an Japan AI Apps provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach sokudoku.net directly.