SpyFu

SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

We run remarkably successful search engine optimisation (SEO) and paid search (PPC) campaigns using a unique blend of data, technology & creativity.

Keywords Everywhere is a browser add-on for Chrome & Firefox that shows search volume, CPC & competition on multiple websites.

Explore Google's developer tools for AI, Cloud, app, web, and software development to help you build smarter and ship faster.

I have been a Web Developer and PPC marketer for more than 15 years, and iSpionage is probably the most reliable competitor research tool I have ever used.