OneSignal

Omnichannel customer messaging platform

OneSignal provides a customer engagement platform that lets businesses design personalised customer journeys that run over SMS, email, in-app messages and push notifications on mobile and web. It sends more than 1.3 trillion messages a year to the 1.5 billion monthly active users of its customers, and roughly one in four app publishers depend on it. Customers in 140 countries range from newly launched startups and small businesses to Live Nation, American Express, Whole Foods and Zynga. OneSignal has offices in San Mateo and London and handles that volume with a comparatively small team.