Postmark vs Twilio Email API
Postmark
postmarkapp.comTwilio Email API
twilio.comSide by side
| Figure | Postmark | Twilio Email API |
|---|---|---|
| Price from | $5/mo | $19.95/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 8 | 5 |
| Spec score · Transactional email services | 9.2 (#1) | 8.5 (#13) |
| Spec score · Transactional Email Software | 8.7 (#7) | 7.9 (#29) |
| Dedicated IP option | Yes | Yes |
| Sending methods | Postmark supports REST API, SMTP, and multi-region SMTP routing. | api |
| Founded | 2010 | 2008 |
| Free plan | Yes | No |
| Integrations | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. | Official client libraries are available for C#, Go, Java, Node.js, PHP, Python, and Ruby. |
| Security | Postmark supports TLS and HTTPS, DKIM, SPF, DMARC, two-factor authentication, API permission controls, penetration testing, and DDoS protection. | SendGrid supports API key authentication and recommends controls including key rotation, IP access management, two-factor authentication, and SSO. |
| Support | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. | The pricing page says expert services and personalized support are available for purchase on Essentials and higher plans. |
Plans
Postmark
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
- Dedicated IP$50 a month
- High-volume plansPriced on request
Twilio Email API
- Pay as you goFree
- Free TrialFree
- Essentials$19.95 a month
- Pro$89.95 a month
- PremierPriced on request
In their own words
Postmark
Postmark delivers and tracks application email as an alternative to SMTP or Sendmail. It separates transactional and broadcast messages into different Message Streams and IP infrastructure. Developers can send through REST API, SMTP, or multi-region SMTP routing, with official libraries for Node.js, Python, Rails, Ruby, PHP, and.NET. Inbound messages can be converted to JSON and sent to a webhook URL. Tracking includes delivery, bounces, spam, opens, and links, with event webhooks. Editable responsive templates cover transactional messages such as password resets, receipts, and invitations. The free Developer plan costs nothing, provides 100 emails per month, permits no overages, and does not expire. Basic starts at $15 a month for 10,000 emails per month; extra emails cost $1.80 per 1,000 and are calculated at the end of the billing cycle. Unused emails do not roll over. Postmark lists API and web access. Its iOS app was sunset in June 2025 and is no longer supported.
Twilio Email API
Twilio Email API has no write-up on Specifiction yet; its figures are above.