title: Online file comparison tool
body: <p>I want to a visualize web file compare tool,that can embed into my app,I know there some software like beyond compare,it has done great job,but it on windows &amp; need buy licence,if someone has develop a web version,then it can cross platform,</p>
  
  <p>does some already achieve this?</p>
  
  <p>if it is python - friendly is great appreciated</p>