OneSignal | 11,009 followers on LinkedIn. The most widely used customer messaging & engagement solution, helping 1M+ businesses deliver 12B+ messages daily. | OneSignal is the market-leading customer messaging and engagement solution, offering email, mobile and web push notifications, in-app messaging, and SMS. Our powerful omnichannel platform enables 1M+ businesses to deliver over 12B+ messages daily. Powered by superior architecture, OneSignal is designed to scale with your business and deliver messages more quickly and reliably than the competition.