100% FOSS — that is how they describe HiNotes, a note-taking app for Android. It has open source code: the project is published as outice2025/HiNotes. The app works with Markdown, meaning the text is marked up right inline. The interface is built with Jetpack Compose and Material 3 Expressive — this is stated in the description. You can check for yourself: download it and see whether it fits your needs. Those looking for a lightweight, open-source notes editor should take a look. Notes are a narrow niche, but projects like this show what a modern open-source stack for Android looks like.
Source: github.com · post in Telegram