No. 188 of 278 ·Language learning apps

OpenKoto

Web · Windows · Mac · Linux · iPhone

Freedom report

Two barsScore 5.7

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely5 of 6 device platforms
DocumentedThinly documented

OpenKoto is ranked #188 of 278 in language learning apps on Freedom251. It runs on iOS, Linux, macOS, Web, Windows. There is a free plan.

OpenKoto plans and pricing

All plans

Free Free Free and open source · Apache 2.0 license github.com · 7 Oct 2026

Compared on language learning apps

Free plan: Yes

Best OpenKoto alternatives

See all 20

Two bars Duolingo Free tier No. 1Free8.2 Two bars Busuu Free tier No. 2Free8.1 Two bars LingQ Free tier No. 3$17.98/mo8.0 Two bars Talkpal Free tier No. 4Free7.9 One bar ELSA Speak Free tier No. 5$13.33/mo7.9 Two bars JapanesePod101 Free tier No. 6$4/mo7.9

The record

Languages offered: 100
Product: OpenKoto is an open-source language-learning app that turns content users choose into reading, translation, and learning material.
Content import: It imports URLs and PDF, EPUB, TXT, Word, and Markdown files with automatic translation and vocabulary extraction.
Reading tools: Its reader offers real-time language switching, instant word lookup, and grammar parsing.
AI assistant: The AI assistant provides contextual word explanations, grammar breakdowns, pronunciation guidance, and interactive questions about highlighted text.
Languages: OpenKoto supports learning and transcription in more than 100 languages, including Japanese, English, Chinese, Korean, French, German, Spanish, Italian, and Portuguese.
Video learning: The maker describes video learning with synchronized subtitles and transcription support on its homepage.
Desktop availability: The maker lists desktop downloads for Mac, Windows, and Linux.
iOS availability: A native app is available for iPhone and iPad, with offline-first use, vocabulary review, and video subtitles.
AI setup: The documentation explains how to connect Google AI Studio or 302.AI API keys to OpenKoto.
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.
License: The project is distributed under the Apache 2.0 license.
Support: The maker directs users to open a GitHub issue or join project discussions for questions.
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.
Price from: Free

Where it ranks on Freedom251

Best Language Learning Apps in 2026#188 of 278
Best Language Immersion Apps in 2026#15 of 25

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Sources

openkoto.com/docs· checked 23 Sept 2026
openkoto.com/docs· checked 7 Oct 2026
openkoto.com· checked 7 Oct 2026
github.com/hikariming/openkoto· checked 7 Oct 2026