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Sites using Postmark

ActiveCampaign Postmark transactional email API.

#13 of 148 in Transactional Email Tracked since Apr 2026 Last seen: Sep 1, 2026 Website: postmarkapp.com
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1,052 sites

879 found by StackScope, 173 via launch platforms

StackScope Wider Web 622 StackScope Discovery (Indie) 257 Product Hunt 126 PeerPush 25 Hacker News 20 Other 2
  • StackScope Wider Web 622
  • StackScope Discovery (Indie) 257
  • Product Hunt 126
  • PeerPush 25
  • Hacker News 20
  • Other 2
View: All sites All launches Launch platforms StackScope Discovery StackScope Wider Web
Last 7 days 0.0% +0.0pp
Most used with Google Search Console, HSTS, Google Analytics
Top product types Productivity, Developer Tools, Marketing
Green hosting 48% vs 45% avg

Postmark has been detected on 1,052 launches we've crawled. The 7-day rolling share is 0.0%, roughly steady week on week. Most recent detection: Post My Prints — Your camera roll, through the letterbox, today.

It's most commonly paired with Google Search Console, HSTS, and Google Analytics. By product type, the launches using it are most often Productivity (20%), Developer Tools (15%), and Marketing (12%). By estimated origin, most come from the United States (53%). By domain ending, launches using it are 4.1 times as likely as the average launch to live on a .store domain. The 169 scored launches using Postmark average a StackScope score of 7.2 out of 10, against 6.4 across all launches we score.

What kind of products ship with Postmark

383 launches

Productivity
20.37%
Developer Tools
15.14%
Marketing
11.75%
Finance
8.62%
AI
8.09%
E-commerce
7.31%
Health
6.79%
Education
5.74%
Social
4.70%
Content
3.39%
Games
2.35%
Crypto
2.09%
Design
1.31%
Hiring & HR
1.31%
Directory
1.04%

Domain endings using Postmark

1,051 sites

  • .com 51.09%
  • .app 8.28%
  • .io 6.57%
  • .ai 5.23%
  • .ca 4.47%
  • .co 2.95%
  • .org 2.47%
  • .dev 2.00%
  • .store 2.00%
  • .net 1.90%
  • .uk 1.52%
  • .nz 1.43%
  • .se 1.14%
  • .xyz 1.05%
  • .online 0.86%

Country

53 of 1,052 sites, where we are confident of the country.

  • United States United States 52.83%
  • United Kingdom United Kingdom 16.98%
  • Canada Canada 3.77%
  • India India 3.77%
  • Serbia Serbia 3.77%
  • Austria Austria 1.89%
  • Bulgaria Bulgaria 1.89%
  • Germany Germany 1.89%
  • Estonia Estonia 1.89%
  • France France 1.89%
  • Iceland Iceland 1.89%
  • Kazakhstan Kazakhstan 1.89%
  • Latvia Latvia 1.89%
  • Philippines Philippines 1.89%
  • Portugal Portugal 1.89%

Share of new sites using Postmark

Each dot is one launch day. Line is the 7-day rolling average; weekly averages before June 2026.

0.0%
last 7 days
+0.0pp vs prior week
1,052
sites all time
since Apr 2026
Postmark daily detection trend Before 8 July 2026: launch platforms only. We began crawling the wider web on this date, so the cohort this share is measured against changes here. 5% 2% 0% Apr May Jun Jul Aug Jul 1, 2026: Adoption figures now count launches from launch platforms. Use the source view to include StackScope Discovery. Jul 3, 2026: Email provider detection improved: providers identified from mail configuration are now caught on a site's first crawl. Earlier data may slightly undercount. Weekly averages before this point, daily after. Jun 3 · 2 / 714 = 0.3% Jun 4 · 1 / 599 = 0.2% Jun 5 · 4 / 581 = 0.7% Jun 6 · 0 / 436 = 0.0% Jun 7 · 2 / 404 = 0.5% Jun 8 · 1 / 515 = 0.2% Jun 9 · 1 / 876 = 0.1% Jun 10 · 1 / 722 = 0.1% Jun 11 · 3 / 577 = 0.5% Jun 12 · 2 / 449 = 0.4% Jun 13 · 0 / 380 = 0.0% Jun 14 · 1 / 345 = 0.3% Jun 15 · 1 / 532 = 0.2% Jun 16 · 3 / 1052 = 0.3% Jun 17 · 1 / 907 = 0.1% Jun 18 · 0 / 674 = 0.0% Jun 19 · 1 / 547 = 0.2% Jun 20 · 0 / 443 = 0.0% Jun 21 · 1 / 383 = 0.3% Jun 22 · 3 / 576 = 0.5% Jun 23 · 2 / 900 = 0.2% Jun 24 · 1 / 737 = 0.1% Jun 25 · 1 / 618 = 0.2% Jun 26 · 0 / 534 = 0.0% Jun 27 · 1 / 431 = 0.2% Jun 28 · 0 / 383 = 0.0% Jun 29 · 2 / 503 = 0.4% Jun 30 · 0 / 801 = 0.0% Jul 1 · 1 / 795 = 0.1% Jul 2 · 1 / 604 = 0.2% Jul 3 · 2 / 499 = 0.4% Jul 4 · 1 / 411 = 0.2% Jul 5 · 0 / 367 = 0.0% Jul 6 · 0 / 551 = 0.0% Jul 7 · 2 / 1171 = 0.2% Jul 8 · 9 / 12590 = 0.1% Jul 9 · 10 / 23745 = 0.0% Jul 10 · 13 / 22552 = 0.1% Jul 11 · 9 / 15979 = 0.1% Jul 12 · 10 / 20291 = 0.0% Jul 13 · 8 / 20922 = 0.0% Jul 14 · 7 / 20408 = 0.0% Jul 15 · 5 / 17242 = 0.0% Jul 16 · 5 / 14264 = 0.0% Jul 17 · 12 / 19732 = 0.1% Jul 18 · 14 / 22700 = 0.1% Jul 19 · 7 / 26075 = 0.0% Jul 20 · 7 / 22586 = 0.0% Jul 21 · 9 / 21649 = 0.0% Jul 22 · 11 / 23202 = 0.0% Jul 23 · 9 / 16863 = 0.1% Jul 24 · 4 / 12855 = 0.0% Jul 25 · 1 / 8947 = 0.0% Jul 26 · 13 / 19976 = 0.1% Jul 27 · 15 / 33865 = 0.0% Jul 28 · 10 / 38221 = 0.0% Jul 29 · 17 / 50103 = 0.0% Jul 30 · 16 / 43952 = 0.0% Jul 31 · 22 / 51110 = 0.0% Aug 1 · 10 / 50484 = 0.0% Aug 2 · 27 / 49661 = 0.1% Aug 3 · 18 / 48190 = 0.0% Aug 4 · 19 / 37326 = 0.1% Aug 5 · 7 / 32706 = 0.0% Aug 6 · 15 / 36581 = 0.0% Aug 7 · 28 / 37888 = 0.1% Aug 8 · 16 / 39680 = 0.0% Aug 9 · 10 / 34205 = 0.0% Aug 10 · 15 / 28846 = 0.1% Aug 11 · 9 / 32018 = 0.0% Aug 12 · 9 / 33478 = 0.0% Aug 13 · 16 / 49912 = 0.0% Aug 14 · 13 / 51428 = 0.0% Aug 15 · 27 / 51492 = 0.1% Aug 16 · 27 / 51806 = 0.1% Aug 17 · 18 / 41413 = 0.0% Aug 18 · 18 / 53842 = 0.0% Aug 19 · 16 / 49415 = 0.0% Aug 20 · 22 / 66830 = 0.0% Aug 21 · 33 / 90358 = 0.0% Aug 22 · 34 / 91513 = 0.0% Aug 23 · 20 / 90227 = 0.0% Aug 24 · 30 / 78847 = 0.0% Aug 25 · 29 / 69248 = 0.0% Aug 26 · 27 / 65056 = 0.0% Aug 27 · 23 / 83369 = 0.0% Aug 28 · 42 / 83310 = 0.1% Aug 29 · 31 / 84155 = 0.0% Aug 30 · 34 / 92079 = 0.0% Aug 31 · 31 / 88629 = 0.0%
Mar 30, 2026 90 days Aug 31, 2026

The shaded part of the chart is measured against a different set of sites. Until 8 July 2026 we only tracked launches from launch platforms; from that date we crawl the wider web as well. The share is a proportion of whatever we were tracking at the time, so it can step at that line without the technology itself changing. For a single continuous measure, switch to launch platforms.

How StackScope detects technologies

⋮ Jul 1, 2026: Adoption figures now count launches from launch platforms. Use the source view to include StackScope Discovery.

⋮ Jul 3, 2026: Email provider detection improved: providers identified from mail configuration are now caught on a site's first crawl. Earlier data may slightly undercount.

Transactional Email leaders

Tool % of launches % of category
#1 – Resend 5.52% 64.07%
#2 ▲1 SendGrid 0.67% 7.76%
#3 ▼2 Amazon SES 0.66% 7.61%
#4 ▲1 MailChannels 0.52% 6.02%
#5 – Mail.Baby 0.44% 5.16%
…
#13 ▼1 Postmark Current page 0.04% 0.49%

Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Transactional Email tool.The most common alternatives to Postmark among indie launches are Amazon SES and MailChannels. All 148 in Transactional Email →

Often used with

Tool Launches
Google Search Console 131
HSTS 113
Google Analytics 98
Tailwind CSS 98
Cloudflare 93

Tools most often detected on the same launches as Postmark.

Recent launches we can show

430 of the 1,052 sites using Postmark are product launches we list individually. The other 622 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works

Post My Prints — Your camera roll, through the letterbox Sep 1, 2026 Loop — Every call, form and chat, tied to the marketing that earned it Sep 1, 2026 Marketing Cognumi — treino cognitivo com leitura honesta do seu desempenho Sep 1, 2026 Foreman — an AI running a human business Aug 31, 2026 AI Crossmio · I loro nomi, in un cruciverba, su ogni tavolo. Aug 31, 2026 Importar Peru - Consulta datos de importaciones hacia Peru sin costo Aug 31, 2026 HELAÜLOOM. Your life, honoured. Aug 31, 2026 RotWithFriends Aug 31, 2026 Social ClearCost Korea Aug 31, 2026 Health IfTheyToldUs — a sourced archive of insider UAP/NHI testimony Aug 30, 2026 Caucus · Stop chasing calendars. Just Caucus. Aug 30, 2026 Productivity Neighborrow Aug 30, 2026 Social

Showing the most recent 12 of 430.

The StackScope API serves all 1,052 sites using Postmark, filterable and exportable, from £15 a month.

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.