Customer.io
Overkill for a weekend project, but worth it once you need real behavioral triggers across email, push, and SMS and your user base has outgrown simple broadcast sends.
What is Customer.io?
Customer.io is a customer engagement platform for sending behavior-triggered messages across email, push, SMS, and in-app, based on what a user actually does in your product. Instead of managing broadcast lists, you build workflows off real events (signed up, hit a usage limit, went inactive for 14 days) and let the platform handle segmentation, timing, and channel selection. It's built for product-led companies that need messaging tied to user behavior, not marketing teams sending newsletters.
Key features
- Visual workflow builder for multi-step, multi-channel campaigns triggered by user or API events
- Segmentation based on live behavioral and attribute data, not static list imports
- Supports email, push notifications, SMS, and in-app/webhook messages from one workflow
- A/B testing and liquid templating for message personalization at scale
- Data pipelines for piping event data in from your product analytics stack
Who it's for
Teams with a real, event-driven user base who need lifecycle messaging that reacts to behavior, not just scheduled sends. It's genuinely overkill for a pre-launch or early-stage product where a simple broadcast tool or even manual emails would do the job just as well for a lot less setup.
Pricing
Tiered subscription plans based on contact volume and the channels/features used, with a trial to test workflows before committing.