# The Postmark alternative for transactional email | Bird

Postmark has a well-earned reputation for fast, reliable transactional delivery. Bird runs on SparkPost, the platform it acquired in 2021 that carries about 40% of the world’s commercial email, and adds idempotency, materially lower cost at higher volumes, and SMS and voice on the same API. Here is where each one fits. See the Bird Email API for the full surface.

## What Postmark is great at. Where Bird is different.

## Low.