Product messages are a requirement for every SaaS product, but most teams outgrow their initial setup fast. You start with one email provider, add push, then SMS, and suddenly you’re maintaining multiple integrations with no shared routing, no preference management, and every copy change requires a deploy. This guide compares five platforms that solve different versions of this problem: Courier for cross-channel messaging with AI tooling, Resend for developer-friendly transactional email,…
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