Postmark
Postmark is specifically built to deliver your app’s emails to the inbox, fast. Instantly send and receive transactional email with zero maintenance. Since we send transactional on
API COMPARISON
Postmark vs Sendgrid
Compare the integration details. Open the source when you need the full picture.
Sendgrid
Delivering your transactional and marketing emails through the world's largest cloud-based email delivery platform. Send with confidence.
Integration at a glance
Missing data is not evidence of missing support.
| Integration detail | Postmark | Sendgrid |
|---|---|---|
| Access & documentation | ||
| Developer documentation | View developer documentation for Postmark | View developer documentation for Sendgrid |
| API reference | View api reference for Postmark | View api reference for Sendgrid |
| Authentication | API KeyServer API token authentication | API KeyAPI key authentication |
| Build & test | ||
| OpenAPI specification | Not recorded as supported | View openapi specification for Sendgrid |
| GraphQL | Not recorded as supported | Not recorded as supported |
| Webhooks | View webhooks for Postmark | View webhooks for Sendgrid |
| Sandbox / test mode | View sandbox / test mode for Postmark | View sandbox / test mode for Sendgrid |
| SDK languages listed | Ruby, .NET, Java, PHP, Node.js | Node.js, Python, Ruby, PHP, Java, .NET, Go |
| Operate & maintain | ||
| Changelog | View changelog for Postmark | View changelog for Sendgrid |
| Service status | View service status for Postmark | View service status for Sendgrid |
| Website | View website for Postmark | View website for Sendgrid |
| Pricing & limits | ||
| Pricing | View pricing for PostmarkFree plan; paid plans from $15.00/mo (Basic, 10,000 emails/month), extra emails @ $1.80 / 1,000; custom high-volume pricing via sales | View pricing for SendgridEmail API: Essentials starting at $19.95/mo, Pro starting at $89.95/mo, Premier custom pricing; price depends on monthly email volume |
| Free tier | 100 emails/month, no overages allowed; free Developer plan does not expire | No free plan since May 2025; free trial of 100 emails/day for 60 days |
| Rate limits | View rate limits for PostmarkNo numeric API rate limit published; HTTP 429 when requests exceed acceptable use. Batch: 500 messages / 50 MB per call | View rate limits for SendgridEach v3 Web API endpoint permits a fixed number of requests per refresh period, reported in X-RateLimit headers; 429 when exceeded |
| Data regions | View data regions for PostmarkData stored in the US (Deft data center near Chicago, and AWS); no EU data hosting listed | View data regions for SendgridGlobal and EU region options; EU data residency needs an EU subuser, an EU dedicated IP (Pro or Premier) and api.eu.sendgrid.com |
Sources & freshness
Catalog data and editorial records can change. Confirm current capabilities and commercial terms with each provider.
Postmark
Editorial record dated · Pricing and limits checked
- postmarkapp.com/developer ↗
- github.com/ActiveCampaign ↗
- postmarkapp.com/pricing ↗
- postmarkapp.com/developer/api/overview ↗
- postmarkapp.com/support/article/do-we-have-rate-limits-for-smtp ↗
- postmarkapp.com/support/article/does-postmark-have-a-daily-send-limit ↗
- postmarkapp.com/eu-privacy ↗
- postmarkapp.com/smtp-service ↗
Sendgrid
Editorial record dated · Pricing and limits checked
- docs.sendgrid.com ↗
- github.com/sendgrid ↗
- www.twilio.com/en-us/products/email-api/pricing ↗
- www.twilio.com/en-us/products/email-api ↗
- www.twilio.com/en-us/changelog/sendgrid-free-plan ↗
- www.twilio.com/docs/sendgrid/api-reference/how-to-use-the-sendgrid-v3-api/rate-limits ↗
- www.twilio.com/docs/sendgrid/data-residency/migrate-subusers ↗
- www.twilio.com/docs/sendgrid/data-residency/faq ↗
- www.twilio.com/docs/sendgrid/data-residency/locations-eu ↗
Before you choose
How do Postmark and Sendgrid price their APIs?
Postmark: Free plan; paid plans from $15.00/mo (Basic, 10,000 emails/month), extra emails @ $1.80 / 1,000; custom high-volume pricing via sales. Sendgrid: Email API: Essentials starting at $19.95/mo, Pro starting at $89.95/mo, Premier custom pricing; price depends on monthly email volume. As listed on each provider's pricing page when checked on 2026-10-20; confirm current prices before choosing.
How should I compare Postmark and Sendgrid?
Start with the operations your application needs, then check authentication, SDKs, webhooks and a sandbox. Validate current pricing, limits and regional availability in the provider documentation before choosing.
Does an empty field mean a feature is unsupported?
No. “Not recorded” means this comparison does not establish the capability. Catalog records can be incomplete or outdated. Follow the linked provider documentation to confirm current support.