[nDmitry]

The difference is Freelancy has native versions for OS X, Windows and Linux. Many people still prefer desktop apps to web services, because they give them the feeling ‘it's my own’ and works in any internet conditions, also it could be more convenient to work with a desktop app rather than with a tab in a browser.

[jrnkntl]

Toggl also has native apps - https://www.toggl.com/tour/desktop

[chrismorgan]

Toggl has native desktop apps also.

[nDmitry]

Yes, it has, but they keep focus on a web version, so Freelancy can be an option for someone. :)