SERPRobot is an advanced analytics tool which allows you to get a detailed graphical report on how your site is performing for every keyword.
The interesting fact about SERPRobot is that it provides this amazing service for merely donations. It does not explicitly charge to get an analytics report. You could easily check your site ranking for up to 5 keywords without even registering on the site.
Additional features provided by SERPRobot post registration include:
- Competitor site search
- Unlimited projects
- Unlimited keywords
- Automatic alerts for rank changes
- API access to display rank at alternate places
- Automatic reports
- Advanced features of narrowing results to specific location