SendGrid vs Postmark
A side-by-side comparison from 100 GitHub-verified developers who shipped production code on both platforms.
SendGrid is the volume leader; Postmark is the deliverability specialist. SendGrid for >1M emails/mo or marketing + transactional in one platform. Postmark for transactional-only where deliverability is non-negotiable. Cost crossover around 1M/mo.
Benchmark Comparison
| Metric | SendGrid | Postmark |
|---|---|---|
| Specialty focus | Transactional + Marketing | Transactional only by design |
| Deliverability (transactional) | 92-96% inbox | 95-98% inbox |
| Cost at 100K/mo | ~$90 | ~$125 |
| Cost at 5M/mo | ~$2,500 | ~$6,250 |
| Pricing predictability | Tier-based with cliffs | Per-email linear |
| Marketing campaigns | Native product | No — integrate separately |
| API surface | Broad, some legacy inconsistency | Tiny, stable |
Operational Verdicts
SendGrid pricing wins meaningfully at scale and the deliverability ops team handles edge cases at volume.
Postmark deliverability beats SendGrid for transactional-only because their infrastructure refuses marketing email.
SendGrid Marketing Campaigns is in the same product. Postmark requires a separate marketing tool integration.
Reviewer Voices
"10M emails/month works without me thinking about it."
"Solid at scale. We migrated for DX reasons."
"Best deliverability we have measured in 10 years of SaaS."
"Linear pricing. No tier surprises."