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Customer.io

Paid

Customer.io is a messaging platform for behavior-based lifecycle campaigns. It ingests product events through its API or SDKs, builds segments from those events, and triggers email, push, SMS or in-app messages when someone does something specific. Workflows support delays, branches and goal checks, so a trial-ending sequence can stop as soon as a user upgrades. It is aimed at product and growth teams that already track user behavior and want messaging to react to it. Pricing is based on profiles and message volume, with a trial to test the integration.

Mailchimp

Freemium

Mailchimp covers the basics of email marketing: audiences, templates, campaigns, A/B tests and reports. Automations can send welcome sequences, follow up after a purchase or re-engage inactive subscribers, and the builder handles landing pages and simple forms as well. A free tier exists for small lists, with paid plans scaling by contact count and features such as advanced segmentation and multivariate testing. It is a sensible starting point for a small business that wants one place for a newsletter and basic customer email without hiring an email specialist.