Postmark vs Twilio SendGrid

Updated November 2026 · AppBreakup editorial

Postmark

Transactional email service focused on fast delivery, with simple volume-based plans.

Free plan + paid

Visit Postmark Postmark profile

Twilio SendGrid

Email API and SMTP relay for app email, plus a separate tool for marketing campaigns.

Paid

Visit Twilio SendGrid Twilio SendGrid profile

The short answer

Postmark suits SaaS teams whose main concern is fast, reliable delivery of password resets, receipts and sign-in links, with simple published pricing and a small permanent free plan. Twilio SendGrid suits companies sending very large volumes that also want a marketing campaign editor from the same vendor. The biggest difference is focus: Postmark is built around transactional email, while SendGrid covers app email at scale plus a separate marketing product.

Postmark or Twilio SendGrid: our take

Both are hosted email APIs that developers reach through a REST API or SMTP, with libraries for common languages. Postmark is designed mainly for transactional mail and keeps it apart from bulk sends using message streams, so a newsletter can't damage the reputation of critical email; it has since added a separate bulk API for broadcasts. It also turns inbound email into JSON webhooks on the Pro tier and above, and keeps searchable activity logs for 45 days by default, up to 365 on higher plans. SendGrid, owned by Twilio, handles authentication, IP reputation, bounces and analytics at very large scale (205+ billion emails a month across its platform), with a 99.99% uptime SLA and dedicated IPs on higher tiers.

Pricing is where they split most clearly. Postmark has a permanent free developer plan of 100 emails a month for testing, then paid tiers from $15/month for 10,000 emails with unlimited daily sending and per-thousand overage. SendGrid has no permanent free plan: new accounts get a trial of 100 emails a day for 60 days, after which a paid plan is needed. SendGrid's Marketing Campaigns tool, with a drag-and-drop editor, templates and list management, is billed separately from the Email API. Its site has also moved into Twilio's, which makes docs and pricing harder to find.

Pick Postmark for a SaaS product or startup that mostly sends transactional email and values delivery speed, clear logs and predictable pricing; it is less suited to large marketing newsletters. Pick SendGrid when volume is very high, dedicated IPs or an uptime SLA matter, or the team wants app email and basic marketing campaigns under one vendor and is fine paying for each separately.

Choose Postmark if…

SaaS teams that care most about fast, reliable delivery of password resets and receipts
You want a free option (Twilio SendGrid is paid only)
Transactional and bulk mail kept in separate streams
Clear published pricing with unlimited daily sending

Choose Twilio SendGrid if…

Companies sending high volumes of app email that also want basic marketing campaigns from the same vendor
Handles very large sending volumes
REST API and SMTP relay with SDKs for most languages

What is Postmark?

Postmark is an email sending service built mainly for transactional messages: password resets, receipts, sign-in links and notifications that users expect within seconds. It keeps those separate from bulk mail using message streams, so marketing sends don't drag down the reputation of critical email, and it now offers a separate bulk API for broadcasts. Developers send through a REST API or SMTP, use server-side templates, process inbound email into JSON webhooks, and search detailed activity logs kept for 45 days by default or longer on higher plans. Pricing is published and simple: a free developer plan with 100 emails a month for testing, then monthly tiers based on volume with per-thousand overage and unlimited daily sending. It is a hosted service with libraries for common languages. Postmark suits SaaS products and startups that care most about delivery speed and clear logs; teams that mainly send newsletters will find it less suited than a marketing-first tool.

What is Twilio SendGrid?

SendGrid, owned by Twilio, is one of the most widely used services for sending email from software. Developers connect through a REST API or SMTP relay to send receipts, password resets, notifications and other transactional mail, and SendGrid handles authentication, IP reputation, bounces and delivery analytics. A separate Marketing Campaigns product gives marketers a drag-and-drop editor, templates, list management and simple automations for newsletters and promotions. Its website has been merged into Twilio's, and accounts are managed through Twilio's console. Pricing scales with sending volume; new accounts get a 60-day free trial of 100 emails a day, after which a paid plan is required, and higher tiers add dedicated IPs and more support. It is a hosted service with SDKs for most languages. It suits companies that want a proven sender at very large scale, while smaller developers often prefer Postmark's focus on transactional speed or Mailgun's free tier.

Side by side

Attribute	Postmark	Twilio SendGrid
Pricing	Free plan + paid	Paid
Open source	No	No
Self-hostable	No	No
Platforms	Web	Web
Best for	SaaS teams that care most about fast, reliable delivery of password resets and receipts	Companies sending high volumes of app email that also want basic marketing campaigns from the same vendor
Status	Active	Active