Brevo
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Brevo (formerly Sendinblue) lets you reach customers across multiple channels with email, SMS, and WhatsApp messaging from one platform. The free plan is notably generous, offering enough credits to explore the platform seriously before paying anything.
You also get a transactional email API for order confirmations and password resets, which works well alongside your marketing campaigns. It's a solid fit for ecommerce or service businesses that want to test omnichannel messaging without heavy upfront investment.