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OpenKoto
What it is
OpenKoto is a free, open-source language-learning app for studying through material users choose. It can import URLs and PDF, EPUB, TXT, Word, and Markdown files, then translate content and extract vocabulary. The reader supports switching languages in real time, instant word lookup, and grammar parsing. Its AI assistant offers contextual word explanations, grammar breakdowns, pronunciation guidance, and questions about highlighted text. OpenKoto supports learning and transcription in more than 100 languages, including Japanese, English, Chinese, Korean, French, German, Spanish, Italian, and Portuguese. The maker also describes video learning with synchronized subtitles and transcription. Desktop downloads are listed for Mac, Windows, and Linux, while native iPhone and iPad apps include offline-first use, vocabulary review, and video subtitles. The maker says desktop data is processed locally; the iOS app keeps learning data on the device and API keys in the iOS Keychain. The project uses the Apache 2.0 license. Its web version is being rebuilt, with vocabulary review, novels, and lyrics planned to sync with iOS and desktop.
For and against
For
- Imports URLs and several document formats.
- Supports learning and transcription in more than 100 languages.
- iOS app includes offline-first use and vocabulary review.
- Desktop app processes data locally, according to the maker.
- Distributed under the Apache 2.0 license.
Against
- The web version is being rebuilt.
- Web features are planned to sync with iOS and desktop.
The verdict
OpenKoto combines reading, translation, vocabulary study, and AI assistance around content users choose. Its platform support and offline-first iOS app may suit learners looking to study across different materials.
Who it suits
OpenKoto suits Japanese and English learners, polyglots, and people who want to study through content they enjoy. Its listed platforms include iOS, Linux, macOS, web, and Windows.
Plans and prices
Free
Free and open source · Apache 2.0 license
Read 7 Oct 2026 · github.com
On the record
- AI assistant
- The AI assistant provides contextual word explanations, grammar breakdowns, pronunciation guidance, and interactive questions about highlighted text.openkoto.com · read 7 Oct 2026
- AI setup
- The documentation explains how to connect Google AI Studio or 302.AI API keys to OpenKoto.openkoto.com · read 7 Oct 2026
- Content import
- It imports URLs and PDF, EPUB, TXT, Word, and Markdown files with automatic translation and vocabulary extraction.openkoto.com · read 7 Oct 2026
- Desktop availability
- The maker lists desktop downloads for Mac, Windows, and Linux.github.com · read 7 Oct 2026
- Intended users
- The documentation describes the app as suitable for Japanese learners, English learners, polyglots, and people who want to learn through content they enjoy.openkoto.com · read 7 Oct 2026
- iOS availability
- A native app is available for iPhone and iPad, with offline-first use, vocabulary review, and video subtitles.github.com · read 7 Oct 2026
- Languages
- OpenKoto supports learning and transcription in more than 100 languages, including Japanese, English, Chinese, Korean, French, German, Spanish, Italian, and Portuguese.openkoto.com · read 7 Oct 2026
- Languages offered
- 100openkoto.com · read 23 Sep 2026
- License
- The project is distributed under the Apache 2.0 license.github.com · read 7 Oct 2026
- Privacy
- The maker says the desktop app runs locally and processes data locally; the iOS app keeps learning data on the device and API keys in the iOS Keychain.github.com · read 7 Oct 2026
- Product
- OpenKoto is an open-source language-learning app that turns content users choose into reading, translation, and learning material.openkoto.com · read 7 Oct 2026
- Reading tools
- Its reader offers real-time language switching, instant word lookup, and grammar parsing.openkoto.com · read 7 Oct 2026
- Support
- The maker directs users to open a GitHub issue or join project discussions for questions.openkoto.com · read 7 Oct 2026
- Video learning
- The maker describes video learning with synchronized subtitles and transcription support on its homepage.openkoto.com · read 7 Oct 2026
- Web version
- The project README describes the web version as being rebuilt, with vocabulary review, novels, and lyrics planned to sync with iOS and desktop.github.com · read 7 Oct 2026
