Customer.io is a cloud-based customer messaging platform for sending targeted emails, push notifications, SMS, and in-app messages based on user behavior. Pricing scales with the number of profiles and message volume, which can get expensive as an audience grows, and all customer data and message history live on Customer.io's servers rather than your own infrastructure.
Novu is the open-source option here, covering in-app, email, SMS, push, and chat notifications through a single API that you can self-host.
FAQ
Is there a free, open-source alternative to Customer.io?
Yes. Novu is open source and free to self-host.
What's the best open-source alternative to Customer.io?
Novu is the option to evaluate — it's built as open-source notification infrastructure across in-app, email, SMS, push, and chat channels in a single API.
What are the top open-source alternatives to Customer.io?
Browse all open-source alternatives to Customer.io above, or explore the full Developer Tools category for more options.