I have a WordPress site where count per day plugin show total visitor 350 but Google analytics show visitor 0 (zero). Why difference? Please help me.
there can be lots of differences: first, check the source code of your site to make sure that analytics is loading with the correct UA number if its not there then thats why you have 0 in analytics. also, as wendallb said, your hit counter might count bots, or even yourself
My guess your plugin might be counting Search engine bots and such traffic as well. There's generally good variances between different stat counters depending on what they are tracking and how they are doing it.
Can be solved by trying to install another plugin instead. Personally I prefer Daily Stat that collects Latest Hits, Latest Search Terms, Latest Referrers, Latest Feeds, Latest Spiders, Latest Spams Bots, and Latest Undefined Agents. Use the built-in add new plugin WP feature to find it and install it and learn more about. In addition, I don't like to rely in a sole stats software or service, I check also the log files, and the stats that Cpanel provides via Awstats, Webalizer and Logaholic.