Best developer experience

Clean SDKs across many languages, full message retention, predictable behavior.

API and SDKs are straightforward and the unified product reduces tool sprawl.

Modern API, clean dashboard, drag-and-drop plus code.

Best React Email experience but skewed toward React stacks; missing idempotency until recently.

Best-in-class staging plus production sending; SDK quality is solid.

Mature SDKs and good docs.

SDKs everywhere but the API patterns feel dated.