NetViewer is a free app developed by Mark Hsu for Android devices. It falls under the category of Utilities & Tools. This app is specifically designed for DHD series DVRs and supports models such as DHD-204, DHD-208, and DHD-216. With NetViewer, users can remotely view, playback, and backup their DHD series DVRs.

The app includes four main functions: Live View, Remote Playback, Remote Backup, and PTZ Control. The Live View feature allows users to view their DHD series DVRs in real-time from their Android devices. The Remote Playback feature enables users to playback previously recorded footage remotely. The Remote Backup feature allows users to backup important footage from their DVRs to their Android devices. Finally, the PTZ Control feature enables users to control the pan, tilt, and zoom functions of their cameras.

Overall, NetViewer is a useful app for those who own DHD series DVRs and want to remotely view, playback, and backup their footage.