http://tinycammonitor.com/
Youtube promo
https://www.youtube.com/watch?v=czo1WbWQTtk

Amcrest cameras supported:
IPM-721S (h264/rtsp, 2-w audio, ptz, preset, relay, led, motion detection)
IP2M-841 (h264/rtsp, 2-w audio, ptz, preset, relay, led, motion detection)
Features:
- Intuitive interface. See the screenshots to appreciate the quality of the app.
- SSL support (HTTPS protocol) for secured monitoring and encrypting credentials (digest authentication).
- 14 different layouts with unlimited number of cameras.
- Control PTZ (pan-tilt-zoom) enabled devices.
- Relay, LED control for some models.
- 24/7 MP4 video recording (Android 4.3+) on local storage/SD card and JPEGs recording to the cloud (Dropbox, Google Drive, Microsoft OneDrive, Amazon Cloud Drive) and FTP/FTPS server.
- Sequence mode for automatic cameras switching.
- Group cameras by tags.
- Easy to use pinch to zoom for digital zooming.
- Import/export settings to local storage (SD card) or cloud service.
- Very CPU efficient.
Unique features:
- Background recording. Make your own DVR! See https://goo.gl/uQMR60
- Internal web server for remote archive access. See https://goo.gl/V7cKeE
- Both in-app and on-camera motion detection. Make automatic recording or send email on motion! See https://goo.gl/0xr45K
- Face detection.
- LAN scanner for automatic cams detection. Have a camera IP address suddenly changed? It takes couple minutes to fully rescan your home network.
- Audio real-time processing (squelch & alarm) for using it as a baby monitor with audio graph.
- Audio monitoring from multiple cameras at once.
- Multiple background audio.
- Cast to Android Wear. See https://goo.gl/eZgaMt
- Google Cast™ Ready (Chromecast). Video only. See https://goo.gl/g1d8yz
- TV interface.
- Widgets and home shortcuts.
- Floating windows.
- Tasker/Locale automation plugin. See https://goo.gl/lAvDdC