VKontakte Widgets
13,285 websites

VKontakte Widgets is free to use

http://vk.com/developers.php?p=Comments

The VK comments widget lets you add comments to your site in a matter of minutes. Installing the ... Read more on the advantages of the VK comment widget. 1.

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Zendesk
764,132 websites

Zendesk offers both free and paid options

http://zendesk.com/

Zendesk provides an integrated on-demand helpdesk - customer support portal solution based on the latest Web 2.0 technologies and design philosophies. The product has an elegant, minimalist design implemented in Ruby on Rails and provide...

Market Share by Top Websites

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

2 In terms of market share, VKontakte Widgets is clearly lagging behind, losing to Zendesk in all segments.

Websites Categories

1 Zendesk has better usage coverage in more websites categories. Including Arts & Entertainment, Games, Adult, Lifestyle and 20 other categories.

2 VKontakte Widgets hasn't got a lead over Zendesk in any websites category.

Geography

1 Zendesk is leading in most countries, including United States, United Kingdom, Canada, Japan and 161 other countries.

2 VKontakte Widgets is leading in Belarus.