Duel - mp4 video collage app for PC

I want to play two videos side by side at the same time...

A collage app that "visualizes the difference between you and your rivals" with videos.
Set chapters for two videos and play them side by side in sync or in slow motion.
Check where the differences are, check the operation and behavior, and check how it has changed.

Videos that can be played are
Videos on your smartphone or tablet.
Videos shot directly with a smartphone, videos imported from a video,
You are free to download videos etc.

◆What you can do with this app
-You can play mp4 video files on your smartphone.
- You can play two videos side by side in sync or in slow motion.
- You can freely set up to 5 playback positions (chapters).

◆This app is recommended for the following people
・For those who want to check motorsports driving videos on-site.
・For those who want to check the difference between us and our competitors with a video
・For those who want to self-check their form such as swinging, batting, dancing, etc.

◆Things to note
This app can play video files (mp4 format, aspect ratio 16:9, full HD or lower) on your smartphone or tablet.
It does not support streaming or downloading.