Knock is described as 'Is customer engagement infrastructure for product-led growth. Activate your data, ship cross-channel messaging, and accelerate growth by managing your product, marketing, and transactional messaging with Knock' and is an app in the social & communications category. There are more than 25 alternatives to Knock for a variety of platforms, including Web-based, SaaS, Windows, Android and Mac apps. The best Knock alternative is Novu, which is both free and Open Source. Other great apps like Knock are VWO Engage, SuprSend, Notifico and Pubnub.
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