This AI-powered reader helps you understand books by providing contextual word definitions, sentence explanations, and passage summaries. You can also chat with AI about the content, convert books to audiobooks, and save new vocabulary.






250+ iOS apps curated and reviewed
Out of 250+ yidou words apps on iOS, 20 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | — | No | Yes | Oct 2026 | ||
| 2 | Free | 5.0★ (1) | No | Yes | Oct 2026 | ||
| 3 | Free | 5.0★ (2) | No | No | May 2026 | ||
| 4 | Free | 4.6★ (132) | Yes | Yes | Oct 2026 | ||
| 5 | Free | 4.8★ (89) | No | No | Oct 2026 | ||
| 6 | Free | 5.0★ (8) | No | Yes | Oct 2026 | ||
| 7 | Free | 5.0★ (1) | No | Yes | Sep 2026 | ||
| 8 | Free | — | No | Yes | May 2026 |












This AI-powered reader helps you understand books by providing contextual word definitions, sentence explanations, and passage summaries. You can also chat with AI about the content, convert books to audiobooks, and save new vocabulary.






This app helps users expand their vocabulary through contextual learning and intelligent spaced repetition. It focuses on building sentences to test understanding of grammar and semantics, offering personalized progress tracking and real-time feedback. Users can also create custom word lists for targeted learning.