Which tools can get approximately accurate traffic information?

[tim wallace]

Recently, I pay more attention on competitor analysis, which is considered so important. However, I want know the daily traffic of each competitor’s site. In addition to Alexa and Google Trends, which tools else can get approximately accurate info. Thanks in advance.

 

[airun0622]

I used several tools, but no one is accurate, I do test use own site.
Unless you can download the competitor’s log files.