OpenKoto
用喜欢的内容学语言
Free
OpenKoto is an open-source, privacy-first language-learning app. Turn the articles, books, and videos you genuinely care about into study material, understand sentences in context, collect vocabulary, and review it on a schedule.
Key features:
• Paste text or import TXT, Markdown, and web content
• Import TXT and EPUB books with automatic chapter splitting, in either a sentence-by-sentence view or the book's original layout
• Import video and audio with SRT / VTT subtitles — or generate subtitles on device when you have none (requires iOS 26)
• Subtitles follow playback sentence by sentence; tap a line to jump to it, loop a single sentence, change speed without changing pitch, and hide the text to shadow by ear
• Read sentence by sentence, resume where you left off, and add bookmarks and highlights
• Show word-level readings above Japanese and Chinese text (furigana / pinyin), generated entirely on device
• Search the full text of everything you have imported — articles, book chapters, and media transcripts — and jump straight to the sentence
• Save vocabulary, organize word packs, and use spaced-repetition review; jump from any card back to the sentence it came from
• View reading and review statistics
• Use the app in English, Simplified Chinese, or Japanese
• Choose light, dark, and multiple visual themes
• Send web pages or selected text to OpenKoto from the iOS share sheet
Optional AI features use a bring-your-own-key model. Configure a compatible provider of your choice for translations and sentence explanations. API keys are stored in the iOS Keychain, while learning content and progress stay on your device. AI requests go directly from your device to your selected provider and do not pass through an OpenKoto app server.
No account is required. Sample articles are included, so reading, vocabulary, and review features work without configuring an AI provider.
OpenKoto is free and open source.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• Word lookups are now saved — no need to look up the same word again after restarting
• New 3-step import wizard: choose a type, add your content, confirm and done
• New guide for downloading and importing videos with subtitles
The developer, 倍铭 刘, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- 倍铭 刘
- Size
- 9.2 MB
- Category
- Education
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Beiming Liu