BookSmartApp vs Polylingo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BookSmartApp
This app helps you remember and engage with your physical books. Save highlights, get daily reminders, and use an AI assistant to answer questions, create social posts, or generate images based on your reading.
- Save and organize book highlights
- Daily highlight reminders
- AI assistant for questions and content generation
- Generate images from book passages
- Share highlights and generated content
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A reading assistant for your physical books. - Save highlights to help you remember important points - Get a daily reminder on the highlights of your choice. - BookBot will answer any questions, create a social post, or create a joke about any piece of text or page from your book. - Search or generate images based on passages from your book. - Share highlights, generated text, or images.
Polylingo
Enhance language learning through reading with instant translations, synchronized audio narration, and AI-generated stories. Save new vocabulary and import your own content to practice reading in a foreign language.
- Instant tap-to-translate
- Audio narration with word highlighting
- AI-powered story generation
- Personal phrase book
- Import EPUB, PDF, and text files
- 10 supported languages
- Customizable reading themes
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Read in a foreign language — without the frustration. PolyLingo turns reading into your most powerful language learning tool. Tap any word for an instant translation. Listen to native-quality narration with every word highlighted as it's spoken. Save vocabulary to your personal phrase book. And when you run out of things to read, let AI write a story just for you. INSTANT TAP-TO-TRANSLATE Tap any word or select a phrase to see its meaning instantly. No copying, no switching apps. Translations include pronunciation (IPA), part of speech, and conjugation info — powered by offline dictionaries that work without Wi-Fi. AUDIO NARRATION WITH WORD HIGHLIGHTING Listen to stories read aloud with professional-quality audio. Every word highlights in sync as it's spoken, so you train your ears and eyes at the same time. Adjust playback speed from 0.5x to 2.0x. Perfect for commutes, workouts, or winding down. AI-POWERED STORIES AT YOUR LEVEL Choose your genre, difficulty level, and interests — PolyLingo generates a complete story tailored to you. Pick from narrative, conversational, descriptive, poetic, or simple writing styles. Every story matches your CEFR level (A1 to C1) so you're always in the sweet spot: challenged but never lost. YOUR PERSONAL PHRASE BOOK Save any word or phrase with one tap while reading. Every entry keeps its context, source, pronunciation, and translation. Review your vocabulary anytime and watch your word count grow day by day. CURATED LIBRARY + YOUR OWN BOOKS Browse stories organized by difficulty, genre, and language. Import your own EPUB, PDF, or text files. Filter by CEFR level (A1–C2) to find content that matches exactly where you are. 10 LANGUAGES SUPPORTED Learn English, Spanish, French, German, Italian, Portuguese, Japanese, Korean, Chinese, or Russian — from 6 home languages. DESIGNED FOR COMFORTABLE READING Choose between Dark, Light, and Sepia themes. Adjust font size. Read in immersive fullscreen mode. Your reading position and audio progress are always saved — pick up right where you left off. POLYLINGO PRO Unlock unlimited AI story generation, advanced phrase book features, and cross-device sync with a free 3-day trial. Whether you're a beginner sounding out your first sentences or an advanced learner tackling literature, PolyLingo meets you where you are — and makes every page count. Download now and start reading in your target language today. This app uses Apple's EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: BookSmartApp at none against Polylingo's 3. BookSmartApp also leads on update cadence (daily vs every 6 days) and rating (5.0 vs 4.8). Polylingo's advantage is ratings volume (4 vs 1) and iOS requirement (13.0 vs 16.0). On price, ads and device support 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. Polylingo sells 3 in-app purchases, starting at $5.99 per 7 days. BookSmartApp asks for nothing beyond the download.
BookSmartApp holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 1 and 4 respectively.
BookSmartApp ships an update daily, Polylingo every 6 days. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.
| Parameter | BookSmartApp | Polylingo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.8 (4 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 4 — better |
| Update frequency | Daily — better | Every 6 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 128 MB |
| Age rating | 12+ | 9+ |
| Developer | Jeff Chandler | Jesse Deng |
Customer experience
BookSmartApp
Polylingo
In-app purchases
BookSmartApp
No in-app purchases
Polylingo
- Weekly Pro Subscription$5.997 Days
- Monthly Pro$14.991 Month
- Yearly Pro Subscription$39.991 Year








