KeyReader vs AI Book Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KeyReader
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Read your own books and understand every word Import your books and read in a foreign language with ease. Tap any word to translate instantly, save new words as flashcards, and explore each chapter through guided questions. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
AI Book Reader
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AI Book Reader is a full-featured EPUB reader with built-in AI. Open any EPUB book, highlight a word or passage, and a smart context menu appears — translate, explain, generate an illustration, or run any custom AI action you've created. Whether you're reading fiction, studying textbooks, learning a language, or exploring non-fiction — AI Book Reader gives you the tools to understand, visualize, and engage with every page like never before. HIGHLIGHT ANY TEXT — GET AI INSTANTLY Select any word, sentence, or paragraph and the AI context menu appears right away. No switching apps, no copy-pasting. The AI works directly inside your book. BUILT-IN AI ACTIONS • Translate — instantly translate any passage to your language • Explain — get a clear, simple explanation of complex text • Illustrate — generate an image to bring a scene or character to life BUILD YOUR OWN AI ACTIONS This is where AI Book Reader goes beyond any other reader. Create completely custom AI actions tailored to your reading style — rewrite text in simpler language, identify all characters in a scene, generate study flashcards, write a critical analysis, or anything else you can think of. Your actions are saved and available in every book. Your first AI generation is free. Continued access to AI features requires a subscription. CLEAN READING EXPERIENCE • Distraction-free interface designed for long reading sessions • Adjustable font size, line spacing, and themes • Full EPUB format support • Reading progress saved automatically AI Book Reader is for curious readers, students, language learners, and anyone who wants more from the books they read. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: KeyReader at every 3 weeks against AI Book Reader's every 2 months. AI Book Reader's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price, ads and in-app purchases 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
Both are free to download. KeyReader sells 3 in-app purchases, starting at $2.99 per month and AI Book Reader sells 2 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.
KeyReader ships an update every 3 weeks, AI Book Reader every 2 months. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | KeyReader | AI Book Reader |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | Oleg Strigunov | Kanat Magdanov |
In-app purchases
KeyReader
- Unlimited Reading$2.991 Month
- Unlimited Reading3 Days trial$19.991 Year
- Unlimited Reading$49.99
AI Book Reader
- Weekly Premium$7.997 Days
- Monthly Premium$29.991 Month
