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...

VS

Qualifio
60 websites

Qualifio costs money

http://www.qualifio.com

Qualifio provides a wide range of interactions : sweepstakes, quizzes, polls, photo & video contests, personality tests and more.

Market Share by Top Websites

1 Hello Bar is leading in The Entire Web.

2 Qualifio is leading in Top 100K Sites.

Websites Categories

1 Hello Bar has better usage coverage in more websites categories. Including Computers Electronics & Technology, Business & Consumer Services, Science & Education, Community & Society and 16 other categories.

2 Qualifio is leading in News & Media, E-commerce & Shopping and Gambling.

Geography

1 Hello Bar is leading in most countries, including United States, India, United Kingdom, Canada and 49 other countries.

2 Qualifio is leading in France, Denmark and Malaysia.