Customer.io is a solid starting tool, but scaling demands more. Campaign delays, channel-specific silos, and repetitive automation won’t cut it. You need cross-channel marketing platforms that adapt instantly. Here are the top Customer.io alternatives, starting with Questera, which offers AI-driven personalization and smarter campaign execution. https://www.questera.ai/blogs/top-5-customer-io-alternatives-for-cross-channel-marketing