Olark
15,414 websites

Olark offers both free and paid options

http://www.olark.com/

Olark is a lightweight tool to chat with visitors to your website using your existing instant messaging client. Visitors to your website appear as buddies on your Buddy list, their messages to you appear as IMs.

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Skype Web SDK
5,731 websites

Skype Web SDK is free to use

https://www.skype.com/en/

The Skype Developer Platform for Web ("Skype Web SDK") is a set of JavaScript Web APIs and HTML controls that enable you to build web experiences that seamlessly integrate a wide variety of real-time collaboration models leveraging Skype fo...

Market Share by Top Websites

1 Olark is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, Skype Web SDK is clearly lagging behind, losing to Olark in all segments.

Websites Categories

1 Olark has better usage coverage in more websites categories. Including Computers Electronics & Technology, Business & Consumer Services, Science & Education, Lifestyle and 13 other categories.

2 Skype Web SDK is leading in Community & Society, Arts & Entertainment, News & Media, Games and 3 other categories.

Geography

1 Olark is leading in most countries, including United States, United Kingdom, Canada, India and 111 other countries.

2 Skype Web SDK is leading in Vietnam, Japan, Denmark, Greece and 19 other countries.