Woopra, the impressive live tracking and analytics service, today announced that they are opening their doors for all new signups. Until today, new users had to be approved if they didn’t have an invite code.

Sure, there are a lot of analytics alternatives, so what makes Woopra so special? Real Time. It’s the big trend this year, and Woopra certainly delivers. Woopra is similar to Google Analytics but provides real time stats and a number of additional features, such as the ability to chat real time with visitors to the site. (See also, Chartbeat and our coverage).

The default mode for Google Analytics and other Website tracking software often makes you wait an entire day to find out what is happening on your site. There is a 24-hour delay (although this can often be changed in settings). Speed up the feedback loop, and Websites in theory could become even more responsive to traffic and attention peaks or to unexpected sluggishness. Betaworks, John Borthwick’s startup holding company which has stakes in Twitter and Tweetdeck, and spun off bit.ly, has just launched Chartbeat.

Keeping with Betaworks’ focus on real-time data services, Chartbeat offers a dashboard for Website owners that monitors how many people are on their site at any given second, where they are coming from, which pages visitors are looking at the most, as well as conversations and links from Twitter. It also shows average load times, what percentage of current visitors are returning, how many are reading, how many are actively writing in comments or engaging with the site in some other way, and how many are simply idle. All it requires is one line of Javascript to be inserted on a site and then it pings Chartbeat every 10 seconds.