Yes, both BuzzSumo and Socialinsider offer a Free Trial.
BuzzSumo is designed for Large Enterprises, Medium Business and Small Business.
Socialinsider is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of BuzzSumo begins at $79/Month when Billed Yearly, while pricing details for Socialinsider are unavailable.
Some top alternatives to BuzzSumo includes ListenFirst, Sprinklr, Hootsuite, Sprout Social, Planable, ShareSpring, Socialinsider, SocialBee, GetSocial, Nudge and Blogalyzer.
Some top alternatives to Socialinsider includes Crowdfire and SocialBee.