Dual Video plays multiple videos simultaneously on the website or in your phone. Use cases: 1. You can compare the video stored in your device and the video on any website. 2. You can compare 2 videos stored in your device too. 3. You can take video by the in-app camera while the other video is playing. 4. You can edit the video so that you can compare that video with the other media easily. (trim and cut) Usage: It is simple. Just tap the play box, then you choose any website or your device to find video. Then, it is a normal video player. Scroll-to-top button: Scroll-to-top button makes the web page to scroll to top. When you move the web page by link, you better click the button to scroll the page to top because it won't scroll automatically. Bookmark: You can add the bookmark of your favorite website or your video in your phone. Camera: Camera is usable. The function is limited though. You can save time to bring the other camera app while using this app. Video trimming: You can trim the video, so it makes easy to compare the videos. Supported Video Format: MP4. For AVCHD(MTS, M2TS), please convert it to MP4 by MTS button on the menu.