Word Guesser is also a tiny (~102 KB) native Android app, and it is moving to Google Play — until that listing is live there is no way to install it for the first time. If you already have it, keep it: it works offline and nothing about it expires. This page and the app share the same daily word and the same leaderboard. The releases page lists what changed per version.
All of them are the same idea: pure Kotlin on the Android framework only — no ads, no tracking, no third-party libraries, and an APK measured in kilobytes.