# Jinshu

> Read your own English books at your level.

Jinshu is a level-aware EPUB reader for English learners who want to read their own books, not only graded lessons. Import an EPUB, see whether the book is Comfort, Good Challenge, or Hard for your current CEFR level, then read with word-level annotations, inline translations, pronunciation, sentence-by-sentence TTS, and vocabulary review with original sentence context. The app also supports Chinese, Japanese, and Korean annotation systems and is tuned for Android e-ink devices.

Made by Built4.Fun (为乐而造) — a small studio making small things for joy.

## Key features

- **Book Fit**: Difficulty report after import/open, with repeated above-level words
- **CEFR annotations**: Words tagged A1–C2, inline while reading
- **Bring your own books**: Import EPUB, Markdown, PDF, and web articles
- **Read-aloud / TTS**: Neural voices with sentence-by-sentence playback and shadowing mode
- **Spaced repetition (SRS)**: Saved words reviewed with original sentence context
- **E-ink optimized**: High contrast, no animations, optimized for Boox and similar devices
- **Offline-first**: All reading data stays on device; no account required
- **Cross-device sync**: Optional iCloud sync; optional Sign in with Apple for purchase restoration
- **Multilingual UI**: EN / 中文 / 日本語 / 한국어

## Platforms

- iOS (App Store): https://jinshu.built4.fun/app-store
- Android / E-Ink: Direct APK download at https://jinshu.built4.fun/download, with arm64-v8a and armeabi-v7a builds for modern and older/e-ink devices
- Android is not distributed through Google Play.

## Pricing

| Plan | Price | Notes |
|------|-------|-------|
| iOS Premium | See App Store | Purchased and managed through Apple's App Store |
| Android monthly | $2.99/mo | Stripe checkout activation code, emailed after payment |
| Android yearly | $8.99/yr | Stripe checkout activation code, emailed after payment |
| Android lifetime | $19.99 | Stripe checkout activation code, emailed after payment |

Android/e-ink Premium can also be unlocked by signing in with Apple if the user already has an active iOS subscription, or by entering a pairing code generated from a paid iOS device.

## Pages

- Homepage: https://jinshu.built4.fun/
- EPUB reader for English learners: https://jinshu.built4.fun/epub-reader-for-english-learners
- CEFR annotations: https://jinshu.built4.fun/cefr-annotations
- Kindle Word Wise alternative: https://jinshu.built4.fun/kindle-word-wise-alternative
- Readlang alternative: https://jinshu.built4.fun/readlang-alternative
- E-ink English reader: https://jinshu.built4.fun/eink-english-reader
- Documentation: https://jinshu.built4.fun/docs
- Buy (Stripe checkout): https://jinshu.built4.fun/buy
- Android download: https://jinshu.built4.fun/download
- Support: https://jinshu.built4.fun/support
- Privacy Policy: https://jinshu.built4.fun/privacy
- Terms of Use: https://jinshu.built4.fun/terms

## Detailed content

- [llms-full.txt](https://jinshu.built4.fun/llms-full.txt): Full text of all pages including documentation, privacy policy, and terms

## Contact

- Support: happinesz+jinshu@gmail.com
- Studio: https://built4.fun/