SEO keyword tool
For a quick stat on where you (or your competition) is ranking in Google...a search is the best way (make sure you are doing this according to the country of preference...ie. google.uk, google.com, google.ca as these WILL change your results). For more information like who you're competitors are, what keywords you are most likely to rank for, steps to rank for those keywords, what+how you must change stuff on your website to boost your SEO requires a specified tool. CanIRank is an keyword intelligence tool that does all of that and there's a free option so you can try it out before committing.