Postmark vs Resend:Which is more popular?
In September 2026, Postmark had more branded searches than Resend among transactional email services worldwide. Postmark had about 77,300 branded searches, while Resend had 50,900. Postmark made up 12.7% of all transactional email service searches we track, and Resend accounted for 8.4%. When we asked ChatGPT and Google AI Overviews about transactional email services, Postmark appeared in all five answers and Resend in four. Resend was mentioned before Postmark in three out of five answers.
Who do people search for more?
Postmark, about 52% more searches than Resend
Who does AI mention more?
Postmark, mentioned in every answer we collected
Who does AI recommend more?
Resend, named ahead of Postmark in 3 of 5 answers
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Top transactional email services in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Postmark appeared in all five answers. Resend was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Resend was listed before Postmark in three out of five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
- Postmark1st
- Resend2nd
Amazon SES3rd
Twilio SendGrid4th
Mailgun5th- SMTP2GO6th
Mailjet–
Mailtrap–
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Postmark5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Amazon SES5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Mailgun4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Resend4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Twilio SendGrid3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- SMTP2GO2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Mailjet0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Mailtrap0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about transactional email services
5 answers
Asked ChatGPT
“Which transactional email service should I use?”
Asked ChatGPT
“What are the best transactional email services?”
Asked ChatGPT
“What's the best transactional email service for app notifications?”
Searched Google, AI Overview
“transactional email service”
Searched Google, AI Overview
“email delivery service”
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Is Postmark or Resend more popular in search?
This chart shows how often people search Google for Postmark and Resend by name. Each line represents a brand's share of searches for all eight transactional email services we track, month by month, from English-language searches worldwide.
Share of searches by month for Postmark, Resend. The figures are in the table below the chart.
View monthly share of searches table
| Month | Twilio SendGrid | Postmark | Mailgun | Mailjet | Resend | Mailtrap | Amazon SES | SMTP2GO |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 41.7% | 8.5% | 14.8% | 14.8% | 2.3% | 8.1% | 4.4% | 5.4% |
| Nov 2025 | 38.5% | 9.6% | 16.7% | 13.7% | 2.8% | 7.5% | 5% | 6.1% |
| Dec 2025 | 39.7% | 12% | 14.2% | 11.6% | 3.3% | 7.8% | 5.2% | 6.3% |
| Jan 2026 | 36.3% | 11.1% | 15.8% | 12.9% | 4% | 7.1% | 5.8% | 7.1% |
| Feb 2026 | 37.5% | 11.4% | 16.3% | 10.9% | 4.6% | 7.3% | 6% | 6% |
| Mar 2026 | 39.7% | 9.9% | 14.1% | 11.6% | 5.5% | 7.8% | 5.2% | 6.3% |
| Apr 2026 | 36.4% | 11% | 15.7% | 10.5% | 6.1% | 8.7% | 5.8% | 5.8% |
| May 2026 | 39.2% | 11.8% | 14% | 9.3% | 6.7% | 7.7% | 5.1% | 6.2% |
| Jun 2026 | 38.3% | 11.6% | 13.7% | 11.2% | 6.7% | 7.5% | 5% | 6.1% |
| Jul 2026 | 33.5% | 12.3% | 14.5% | 9.7% | 9.1% | 8% | 6.5% | 6.5% |
| Aug 2026 | 35.9% | 13.3% | 12.7% | 8.5% | 8.7% | 7% | 6.9% | 6.9% |
| Sep 2026 | 34.4% | 12.7% | 12.2% | 12.2% | 8.4% | 6.7% | 6.7% | 6.7% |
How has the Postmark and Resend comparison changed over the last 12 months?
3 findings
- Postmark was ahead of Resend in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Postmark’s share of searches among transactional email services worldwide moved from 8.5% to 12.7%, and its estimated monthly branded searches moved from 63.5K to 77.3K.
- Across the 12 months ending September 2026, Resend’s share of searches among transactional email services worldwide moved from 2.3% to 8.4%, and its estimated monthly branded searches moved from 17K to 50.9K.
How did search popularity change for transactional email services worldwide in September 2026?
3 changes
In September 2026, Mailjet overtook Resend to rank 4th among transactional email services worldwide, with 12.2% of the searches.
In September 2026, Postmark lost share of searches among transactional email services worldwide, from 13.3% to 12.7%.
Estimated monthly branded searches for Resend worldwide rose 200.4% over 12 measured months, from 17K to 50.9K in September 2026.
How are branded searches counted?
7 search terms
Brandwave collects information about searches that people make online using Postmark’s and Resend’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Other head-to-heads among transactional email services
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