Neither GreenArrow Engine nor Kingmailer offers a free trial.
GreenArrow Engine is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Kingmailer is designed for Large Enterprises, Medium Business and Small Business.
Pricing details for both GreenArrow Engine and Kingmailer are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to GreenArrow Engine includes SMTP, Campaigner and Moosend.
Some top alternatives to Kingmailer includes SMTP, Campaigner and Moosend.