Resend vs SendGrid

Pick Resend if you're a product team shipping transactional email in a modern stack—its 18 tools cover the core send/template/domain workflow without cruft, and the API-key auth takes five minutes to wire in. SendGrid's 50 tools span marketing campaigns, A/B testing, and legacy SMTP plumbing that most AI workflows never touch; you pay the complexity tax navigating a surface area built for enterprise email ops. For pure transactional sends triggered by AI agents (password resets, order confirmations, webhook alerts), Resend wins on focus. Choose SendGrid only if you already run marketing automation there and need the AI to read campaign stats or manage suppression lists. Switching later costs a day of endpoint rewrites and template migration—not catastrophic, but enough friction to pick right the first time.