# What does Postmark use? Postmark (postmarkapp.com) shows public evidence of 27 tools, according to runsonwhat (last checked 2026-10-12). ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | Website code | | | [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Custom domain, Website code | | | [Amazon Route 53](https://www.runsonwhat.com/reverse/route53) | DNS | DNS records | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code | | ## Data & Observability | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code | | | [Google Tag Manager](https://www.runsonwhat.com/reverse/gtm) | Analytics | Website code | | | [Microsoft Clarity](https://www.runsonwhat.com/reverse/clarity) | Analytics | Website code | | | [Hotjar](https://www.runsonwhat.com/reverse/hotjar) | Analytics | Website code | | | [Bugsnag](https://www.runsonwhat.com/reverse/bugsnag) | Monitoring | Website code | | | [Sorry](https://www.runsonwhat.com/reverse/sorryapp) | Monitoring | Custom domain | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Ads](https://www.runsonwhat.com/reverse/google-ads) | Ads & Pixels | Website code | | | [Meta Pixel](https://www.runsonwhat.com/reverse/meta-pixel) | Ads & Pixels | Website code | | | [Microsoft Ads](https://www.runsonwhat.com/reverse/bing-ads) | Ads & Pixels | Website code | | | [LinkedIn Insight Tag](https://www.runsonwhat.com/reverse/linkedin-insight) | Ads & Pixels | Website code | | | [Zendesk](https://www.runsonwhat.com/reverse/zendesk) | Support & Docs | Email records, Website code | | | [X Ads](https://www.runsonwhat.com/reverse/x-ads) | Ads & Pixels | Website code | | | [ChatGPT Ads](https://www.runsonwhat.com/reverse/chatgpt-ads) | Ads & Pixels | Website code | | | [Reddit Ads](https://www.runsonwhat.com/reverse/reddit-ads) | Ads & Pixels | Website code | | | [MNTN](https://www.runsonwhat.com/reverse/mntn) | Ads & Pixels | Website code | | | [Help Scout](https://www.runsonwhat.com/reverse/helpscout) | Support & Docs | Email records | | | [Rewardful](https://www.runsonwhat.com/reverse/rewardful) | Marketing | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code | | | [OneTrust](https://www.runsonwhat.com/reverse/onetrust) | Security & Compliance | Website code | | | [DMARC Digests](https://www.runsonwhat.com/reverse/dmarcdigests) | Security & Compliance | Email records | | | [AbuseIPDB](https://www.runsonwhat.com/reverse/abuseipdb) | Security & Compliance | DNS verification records | | ## FAQ ### What tools does Postmark use? As of October 2026, runsonwhat has found 27 tools at Postmark (postmarkapp.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon Route 53. Application: Tailwind CSS. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Google Ads, Meta Pixel and Microsoft Ads. Company Ops: Google Workspace, OneTrust and DMARC Digests. Last checked October 12, 2026. ### What cloud does Postmark run on? Postmark uses Amazon Web Services for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through a subdomain that points at Amazon Web Services and code on postmarkapp.com. Amazon Web Services is used by 145,139 companies runsonwhat tracks. ### What email provider does Postmark use? Postmark uses Google Workspace for email and office software, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on postmarkapp.com. Google Workspace is used by 399,667 companies runsonwhat tracks. ### What does Postmark use for customer support? Postmark uses Zendesk for customer support and documentation, alongside Help Scout, according to runsonwhat (October 2026). runsonwhat found Zendesk through email records that authorize Zendesk and code on postmarkapp.com. Zendesk is used by 41,227 companies runsonwhat tracks. ### What analytics tools does Postmark use? Postmark uses Google Analytics for analytics, alongside Google Tag Manager, Microsoft Clarity and Hotjar, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on postmarkapp.com. Google Analytics is used by 860,928 companies runsonwhat tracks. ### What marketing software does Postmark use? Postmark uses Rewardful for marketing, according to runsonwhat (October 2026). runsonwhat found Rewardful through Rewardful code on postmarkapp.com. Rewardful is used by 1,880 companies runsonwhat tracks. ### Does Postmark use Cloudflare? Yes. runsonwhat found Cloudflare at Postmark through Cloudflare code on postmarkapp.com. Cloudflare is a CDN & Edge tool used by 696,212 companies runsonwhat tracks. ### Which companies have a tech stack similar to Postmark's? The companies with the stacks most like Postmark's are Pipedrive, Flipsnack, CarePortal and Cloudfabric, according to runsonwhat (October 2026). Each shares 3 to 14 tools with Postmark, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Postmark uses? runsonwhat reads public records only. Of the 27 tools at Postmark, 17 were found through code on postmarkapp.com, 4 through email records, 3 through DNS records, 2 through subdomains that point at the vendor and 1 through website configuration files. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and postmarkapp.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/postmarkapp.com (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.