Yes, both Circle and Convolio offer a Free Trial.
Circle is designed for Large Enterprises, Medium Business and Small Business.
Convolio is designed for Medium Business and Small Business.
Pricing for Circle Starts at $39/Month whereas for Convolio Starts at $99/Month.
Some top alternatives to Circle includes Skool, Qualified, Workvivo, Sociohub, AfterClass, Orbit, Mighty Networks, Smartwebs, SuperFans and Convolio.
Some top alternatives to Convolio includes CloudSocial, Posted, Qualified, Workvivo, Commons, Blog To Social, Sociohub, Panion, Moderate, Smartwebs, Socital and IFTTT.