Customer.io

Sends email and push messages triggered by user behaviour.

Category	CRM & automation
Pricing	Paid
Tags	messaging, automation
Official site	customer.io

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Pricing: Paid

Paid means you need to pay to keep using it. Tools with only a free trial are here, and so are ad platforms, where the account is free but the ads are not.

Pricing changes often. The tags were compiled in October 2026 and may be out of date, so confirm on the official pricing page before you pay.