Yes, both Tweet Ninja and ThreadStart offer a Free Trial.
Tweet Ninja is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
ThreadStart is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Tweet Ninja Starts at $19/Month whereas for ThreadStart Starts at $7.16/Month when Billed Yearly.
Some top alternatives to Tweet Ninja includes Zoho Social, Crowdfire, SocialBee, Buffer, Planable, Later, SocialBu, Naytev, Ultimate SMM, Tweetastic, Redfeets, SocialPear, BTweeps, Twitter Ads and Tweepsmap.
Some top alternatives to ThreadStart includes Zoho Social, Crowdfire, SocialBee, Planable, SocialMgr, Later, Socialdraft, Broadcast, Smart Post App, CloudSocial, SocialHub, SocialGest, Thread Creator, Tweetastic and Tweetmonk.