Merge and diff documents online.
- (2021-03-30) Timor: 只能在线。只能导入文件，否则一旦失去焦点，窗口就消失了，那还怎么用。。。
- (2017-06-20) good
- (2017-01-13) Dmitry Belyavsky: Very neat, thanks devs!
- (2015-02-24) I love it when a tool does exactly what it is supposed to do. Thank you.