An experienced team building fun, useful apps.
Qin Cloud LLC is a software development team focused on mobile apps, browser extensions, cloud services, and AI-powered tools that make everyday media more enjoyable.
We ship products people actually enjoy using
Product-minded engineers
We design, build, and maintain end-to-end products — from the client UI to backend APIs and cloud infrastructure.
Fast, continuous delivery
Regular releases, careful updates, and quick fixes based on real user feedback.
Privacy & compliance first
We publish clear privacy policies and terms of service for every product, and handle user data responsibly.
Full-stack development capabilities
Mobile Apps
Native Android development: in-app browsers, media playback, overlay UI, and personalized settings.
Browser Extensions
Chrome and Edge extensions that enhance web pages with rich, interactive features.
Backend & Cloud
API design, data storage, task queues, deployment, and ongoing operations.
AI Speech & Translation
Speech recognition, subtitle timing, and machine translation for practical everyday tools.
sub-box · Subtitle Box
Automatic Chinese subtitles for online videos
sub-box detects the video you open on supported sites and instantly matches Chinese subtitles. When no subtitle exists, our cloud AI recognizes speech, translates it, and pushes the result straight to the player.
- Smart subtitle matching across supported sites
- Cloud AI speech recognition & translation
- Style controls, danmaku comments, and favorites
- Android app + Chrome / Edge extension, one account for both
Product site: mmjd.club