Yes, both PushAd and VWO Engage offer a Free Trial.
PushAd is designed for Individuals, Large Enterprises, Medium Business and Small Business.
VWO Engage is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for PushAd Starts at $5/Month whereas for VWO Engage Starts at $99/Month.
Some top alternatives to PushAd includes VWO Engage, OneSignal, PushAssist, PushBots, PushAlert, Push.World, Adrack Web Push, PushPushGo, PushNinja, Adrenalead and SmartPush.
Some top alternatives to VWO Engage includes OneSignal, PushBots, PushAlert, Push.World, PushPro, TITANPush, Notificare, PushNinja, SmartPush and Notificationpro.