What is qingzai?

QingZai is an Android app that downloads content from Douyin, the Chinese version of TikTok, without the watermark that Douyin normally stamps onto shared videos. It is built as a fully native app with no backend server: every step, from parsing the shared link to saving the final file, happens directly on the phone. The app handles several kinds of Douyin content. For videos, it reads a shared Douyin link, pulls out the watermark-free version, and streams it straight into the phone's photo album. For image and text posts, it saves each picture individually to the album without compressing them. It can also detect animated image posts and automatically merge in their background music, and it can combine a set of still images with background music into a single video file. Downloads run in a background queue with up to two tasks at once and show live progress, and the app keeps a persistent history of both past downloads and past link lookups so users can revisit or reuse them later. It also registers as a share target, so a user can share a link directly from the Douyin app into QingZai. Under the hood it is written in Kotlin using Jetpack Compose for the interface and Material 3 for styling, follows an MVVM architecture with Hilt for dependency injection, uses OkHttp for network requests, Coil for image loading, Media3 ExoPlayer for video playback, FFmpegKit for combining images and audio into video, Room for its local database, and WorkManager for background download tasks. Files are saved through Android's MediaStore system, which is the standard, permission-safe way apps store media on Android 10 and newer. The app requires Android 8.0 or newer to run. Building it requires Android Studio's bundled JDK and the standard Gradle commands to assemble and install a debug build onto a connected device. The project is released under the MIT license.