Yes, both Chargebee and RetentionEngine offer a Free Trial.
Chargebee is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
RetentionEngine is designed for Large Enterprises, Medium Business and Small Business.
The starting price of RetentionEngine begins at $19/Month, while pricing details for Chargebee are unavailable.
Some top alternatives to Chargebee includes billwerk, Subill, Zuora Billing, Billsby, ChimpCharge, Fusebill, ReCharge, Recurly and RevenueCat.
Some top alternatives to RetentionEngine includes ChurnZero, ClientSuccess, ProsperStack, Custify, EasyCSM, Freshdesk Customer Success, Upzelo, ChurnKey and Freshdesk Customer Success (Formely Freshsuccess).