Postmark vs Twilio Email API
Postmark
postmarkapp.comTwilio Email API
twilio.comSide by side
| Figure | Postmark | Twilio Email API |
|---|---|---|
| Price from | $5/mo | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 8 | 2 |
| Spec score · Transactional email services | 9.2 (#1) | 7.4 (#34) |
| Spec score · Transactional Email Software | 8.7 (#7) | 7.4 (#36) |
| Company history | Postmark says it has delivered billions of emails since 2010. | Twilio says it was founded in 2008 to simplify telecommunications and bring communications to the cloud. |
| Founded | 2010 | 2008 |
| Security | Postmark supports TLS and HTTPS, DKIM, SPF, DMARC, two-factor authentication, API permission controls, penetration testing, and DDoS protection. | Twilio SendGrid lists SPF, DKIM, DMARC, and TLS encryption among its email security features. |
| Support | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. | Twilio SendGrid says its email experts can help with setup, troubleshooting, deliverability, and open rates. |
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
- Twilio Email free trialFree
- Twilio Email pay-as-you-goFree
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 lets teams add transactional and marketing email to applications and cross-channel workflows through the Twilio Console. Requests use JSON and can address one or multiple recipients; emails can be scheduled up to seven days ahead. LiquidJS templates can personalize subject, text and HTML fields, while status reporting covers sent, delivered, undelivered, opened and failed messages. Real-time email logs and deliverability tools are included. Requests with attachments have a 10 MB limit and can include no more than 10,000 recipients. The listed pay-as-you-go plan costs nothing, billed per email sent at $0.0013 per email, with no monthly base fee, feature tiers or overage charges. A 30-day free trial offers 100 free emails per day. The API is listed for web and API use, with delivery by API; templates are listed as both and delivery logs are retained for 7 days. Twilio says Email and SendGrid are separate products built on the same email infrastructure, with SendGrid intended for high-volume transactional and marketing email.