Hello Bar
406 websites

Hello Bar offers both free and paid options

http://www.hellobar.com/

The Hello Bar is a customizable, relatively unobtrusive bar that sits at the top of a website and directs visitors with a call to action. For example, the bar on Gary Vaynerchuk’s website prompts visitors to “Circle me up on Google+!”, whil...

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TwitterCounter
575 websites

TwitterCounter is free to use

http://twittercounter.com

Twitter Counter provides statistics of Twitter usage and tracks over 94 million users and counting. Next to that it offers Pro Twitter Stats for even more powerful statistics and sells featured spots on its website to people who want to gai...

Market Share by Top Websites

2 Hello Bar is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 TwitterCounter has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Community & Society, Science & Education and 10 other categories.

2 Hello Bar is leading in Business & Consumer Services, Health, Food & Drink, Heavy Industry & Engineering and 2 other categories.

Geography

1 TwitterCounter is leading in most countries, including Russia, Brazil, France, Spain and 46 other countries.

2 Hello Bar is leading in United States, Belgium, Argentina, Finland and 16 other countries.