Cost: Free to $99 a month
What it does: Web site analytics
What it solves: Web optimization issues
SiteApps taps into Google Analytics to make recommendations for how you can improve your website. I recently launched a new site, Startup50, and from SiteApps I learned that a significant number of readers access my site from tablets. SiteApps recommended a tool that would create a mobile optimized version of my site. Other apps that may be recommended to you include lead-capture forms, social media widgets, user segmentation surveys, etc.