Any product that sends transactional email — receipts, password resets, notifications. Proven at billions of sends per day.
As a primary marketing/campaign tool — Klaviyo, HubSpot, and Iterable all outclass the Marketing Campaigns product.
What is SendGrid (Twilio)?
SendGrid, acquired by Twilio in 2019, is the most established transactional email API. Developers integrate its SMTP relay or REST API to send password resets, receipts, and notifications at scale. The Email API is what most people buy; Marketing Campaigns is a secondary product with lists, segments, and A/B testing but is generally outclassed by Klaviyo/HubSpot/Iterable for campaign marketing. Best treated as infrastructure rather than a marketing platform.
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