Kotonoki vs Bookbench
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kotonoki
Learn Japanese vocabulary and grammar by watching anime. The app generates lessons based on selected series and episodes, offering kanji, furigana, and romaji support. It features spaced repetition for review and daily vocabulary practice.
- AI-generated Japanese lessons from anime
- Vocabulary and grammar study
- Spaced repetition review system
- Kanji, furigana, and romaji support
- Daily vocabulary and phrase practice
- Contextual example sentences
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Learn Japanese through the anime you love. Choose a series and episode, then Kotonoki builds a focused lesson around its Japanese vocabulary. For learners from JLPT N5 to N1. Choose your level during onboarding, and Kotonoki introduces vocabulary at and just above it. Kanji, furigana, and Hepburn romaji give you the support you need as you build confidence. Start with a ready-made lesson during onboarding and begin studying in your first minute. LESSONS IN CONTEXT Lessons use Japanese subtitles when available and episode synopses when they are not. Each item includes kanji, a kana reading, romaji, a translation, and a contextual example sentence. Tap a word for an AI explanation of the grammar in its example sentence. REVIEW THAT ADAPTS TO YOU Spaced repetition supports review of vocabulary, kana, and kanji. Kanji meanings and readings are tracked separately, so you can review what you need. Study kanji from components to compounds; every kanji in the app includes an example word and an AI mnemonic story. A LITTLE JAPANESE EVERY DAY Add Kana of the Day, Kanji of the Day, and Phrase of the Day to your Home Screen or Lock Screen. Phrase of the Day includes a kana reading. MORE IN KOTONOKI - Choose System, Light, or Dark appearance - Search your library and the anime catalog in one place - Follow lesson-generation progress as words are prepared SUBSCRIPTION Try Kotonoki free for 7 days. A subscription includes 30 new AI lesson generations each month and unlimited access to ready-made lessons. Cancel anytime in your App Store account settings. Kotonoki is built by an independent studio. Send feedback directly to the maker. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kotonoki.addicted.sh/privacy.html Terms of Service: https://kotonoki.addicted.sh/terms.html
Bookbench
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Nobody can out-think AI anymore. But you can out-think the people who let AI think for them. You read a page, you know every word on it, and a minute later you can't say what it meant. Bookbench is built to fix that. Here the AI doesn't read for you. It helps you understand, and the understanding stays yours. THE BOOK, A TUTOR AND A NOTEBOOK, SIDE BY SIDE Three screens on one canvas: the book in the middle, an AI tutor on one side, your notebook on the other. One swipe between them. No copying text into a chatbot, no switching apps, no losing your place. A TUTOR THAT ALREADY KNOWS WHERE YOU ARE • It sees the book, the chapter and the page you are on • Type just "explain" and it knows what you mean • Explains a hard term, a dense sentence or a whole chapter in plain words • Answers from what is actually written in the book and quotes the lines: tap a quote to jump to that place • Marks the key points right in the text of the book • Reads your notebook: write down your own conclusion, and it can tell you what you missed WORK THE TEXT, DON'T JUST GET THROUGH IT • Select a passage and add it to your notebook as a quote • Write down key ideas, definitions and the thoughts that come while you read • A real text editor: headings, lists, links, styles • Bookmarks that lead back to the exact spot in the book • The tutor adds to your notebook when you ask; you stay the one who edits it A QUIET READER • EPUB and FB2 books from anywhere on your device • Font, size and background the way your eyes like them • Remembers where you stopped • Reading and notes work offline MADE FOR Textbooks and courses, dense non-fiction, classics, books in a language you are still learning: anything worth reading slowly, with a pen in hand. GOOD TO KNOW • EPUB and FB2 only: no PDF, no audiobooks • You bring your own books; Bookbench is not a store • The AI tutor needs an internet connection; the reader and the notebook do not FREE AND SUBSCRIPTION Reading and the notebook are free, with no limits and no account. The AI tutor gives you 3 free answers; after that it comes with a 3-day free trial, then a monthly subscription. • Payment is charged to your Apple Account at confirmation of purchase • The subscription renews monthly unless it is turned off at least 24 hours before the end of the current period • Manage or cancel it any time in Settings › Apple Account › Subscriptions • Any unused part of the free trial is forfeited when you buy a subscription PRIVACY Your books and your notebook are stored on your device. To answer, the tutor sends passages of the book, your questions, your reading goal and your notebook to DeepSeek, whose servers are in China. No account, name or email goes with them. The app asks your permission before the first question. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://raw.githubusercontent.com/udevwork/docs/refs/heads/main/BookbenchPrivacyPolicy Questions, bug reports and feature requests: udevwork@gmail.com
Screenshots
Verdict
The clearest difference is iOS requirement: Kotonoki at 18.0 against Bookbench's 26.0. On price, ads, in-app purchases 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. Kotonoki sells 2 in-app purchases, starting at $7.99 per month and Bookbench sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | Kotonoki | Bookbench |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 weeks | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 9 MB | 20 MB |
| Age rating | 12+ | 4+ |
| Developer | Egor Sazanov | Denys Kotelnykov |
In-app purchases
Kotonoki
- Kotonoki Monthly$7.991 Month
- Kotonoki Yearly$59.991 Year
Bookbench
- Pro3 Days trial$9.991 Month









