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OneSignal offers Free Trial, but PushNinja does not.
OneSignal is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
PushNinja is designed for Large Enterprises, Medium Business and Small Business.
Pricing for OneSignal Starts at $9/Month whereas for PushNinja Starts at $9.99/Month when Billed Yearly.
Some top alternatives to OneSignal includes VWO Engage, PushEngage, Push Monkey, PushBots, PushAlert, Push.World, TITANPush, WonderPush, Notificare, PushNinja and Webpushify.
Some top alternatives to PushNinja includes VWO Engage, PushEngage, PushAd, OneSignal, NotifyVisitors, Engagespot, PushBots, TITANPush, WonderPush, Notificare and Notificationpro.