Sailthru Horizon
316 websites

Sailthru Horizon is free to use

http://getstarted.sailthru.com/

Third, enter your full Horizon subdomain, i.e. horizon.yourdomain.com, under the "Horizon Subdomain" field in your Sailthru account settings.

VS

Spectate
240 websites

Spectate offers both free and paid options

http://spectate.com/

Spectate is a new kind of marketing for a new kind of marketer. Spectate makes content marketing easy by focusing on what matters: results.

Market Share by Top Websites

2 Sailthru Horizon is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Sailthru Horizon has better usage coverage in more websites categories. Including News & Media, Food & Drink, Arts & Entertainment, Travel & Tourism and 15 other categories.

2 Spectate is leading in Science & Education, Health, Law & Government and Computers Electronics & Technology.

Geography

1 Sailthru Horizon is leading in most countries, including United Kingdom, Hungary, Italy, Australia and 23 other countries.

2 Spectate is leading in United States, Canada, Ukraine, Bangladesh and 4 other countries.