This app is developed by SC4SC from KAIST, using Expo.
As a standalone app, KAIREN is served from Apple App Store and Google Play Store. Build this app using expo build:ios and expo build:android, you can get both .apk and .ipa files.
You can get more information about this app from https://kairen.kaist.ac.kr. We're still working on the website introducing KAIREN to more people.