Useful Search Engine Optimization Tools
ServiceKeyword Research:A/B Testing and Conversion Rate Optimization (CRO)Website ToolsSocial Monitoring ToolsCopyright Violations
Google AdWords Keyword Planner (Requires a free AdWords account)
Wordtracker’s database of 3.5 billion searches per month, is completely independent of Google’s data.
Google Webmaster Tools - The most accurate tool for website owners to identify keywords driving visitors.
Google Correlate - Identify keywords that are similar to your selected phrases.
Nerdy Data: Compare keyword search volume visually.
Merge Words: Merge words.All the good testing tools have fees but many have free trials.
Robots.txt Checker: This robots.txt checker is a "validator" that analyzes the syntax of a robots.txt file to see if its format is valid as established by Robot Exclusion Standard or if it contains errors.
Wayback Machine: Historical view of web pages
HTML Validation validator.w3.org
copyscape.com - finds web pages containing your content.
SEMRush – A competitor research tool for keywords and rankings.
SerpIQ: Locate competitors by keywords and analyze their keyword usage.
MOZ Keyword Difficulty Tool is part of an excellent Pro tool suite.
Raven Tools - Keyword data plus a full suite of tools.
KeywordSpy – Great for discovering competitive keyword analysis.
Wordle - wordle.net
CrazyEgg: great for helping clients visualize user engagement.
Optimizely: A/B testing and Conversion Rate Optimization
Visual Website Optimizer allows you to run A/B tests with a simple online editor that lets you test content without knowing code.
SEO Browser – quick glance at a web page’s important SEO structure.
Screaming Frog SEO Spider: A tool we use all the time to review data search crawlers see on a website.
SocialBro: Provides Twitter data