The best alternatives to Knock Sources are SuprSend, Knock, and MagicBell. If these 3 options don't work for you, we've listed a few more alternatives below.
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SuprSend is a notification infrastructure to build and manage product notifications across all channels. With SuprSend API and dashboard, developers and product owners can ship cross-channel notifications fast, iterate on them quickly and scale easily.
Knock is a flexible API and dashboard for powering delightful product notification experiences. It helps you ship faster, iterate on your product messaging, and scale your notifications for the long-term. We built product notifications so you don’t have to.
Meet MagicBell - the inbox for your product's workflow notifications. Instead of relying on email, notify your users of important updates in-app, boosting productivity and collaboration. Customize the UI, embed the code, and use the API to get started!