# What does UnderDefense use? UnderDefense (underdefense.com) shows public evidence of 35 tools, according to runsonwhat (last checked 2026-10-19). - Industry: Computer & Network Security - Size: 201–1,000 employees - Based in: New York, United States - Founded: 2018 - LinkedIn: https://www.linkedin.com/company/underdefense ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Email records, Website code | | | [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Website code | | | [Google Cloud](https://www.runsonwhat.com/reverse/gcp) | Hosting & Cloud | Custom domain | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [jQuery](https://www.runsonwhat.com/reverse/jquery) | Frontend | Website code | | | [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | Website code | | | [YouTube](https://www.runsonwhat.com/reverse/youtube) | Media & UI | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | DNS verification records | | ## 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 | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [WordPress](https://www.runsonwhat.com/reverse/wordpress) | Website & CMS | Website code | | | [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 | | | [Yoast SEO](https://www.runsonwhat.com/reverse/yoast) | Website & CMS | 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 | | | [Mailchimp](https://www.runsonwhat.com/reverse/mailchimp) | Marketing | Email records | | | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Email records, Website code | | | [X Ads](https://www.runsonwhat.com/reverse/x-ads) | Ads & Pixels | Website code | | | [Ahrefs](https://www.runsonwhat.com/reverse/ahrefs) | Marketing | Website code | | | [AdRoll](https://www.runsonwhat.com/reverse/adroll) | Ads & Pixels | Website code | | | [Snov.io](https://www.runsonwhat.com/reverse/snov) | Sales & CRM | Custom domain | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records | | | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code | | | [reCAPTCHA](https://www.runsonwhat.com/reverse/recaptcha) | Security & Compliance | Website code | | | [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records | | | [Amazon SES](https://www.runsonwhat.com/reverse/ses) | Email Delivery | Email records, Website code | | | [Let's Encrypt](https://www.runsonwhat.com/reverse/letsencrypt) | Security & Compliance | DNS records | | | [Sectigo](https://www.runsonwhat.com/reverse/sectigo) | Security & Compliance | DNS records | | | [DigiCert](https://www.runsonwhat.com/reverse/digicert) | Security & Compliance | DNS records | | | [Google Trust Services](https://www.runsonwhat.com/reverse/google-trust) | Security & Compliance | DNS records | | | [Amazon Trust Services](https://www.runsonwhat.com/reverse/amazon-trust) | Security & Compliance | DNS records | | ## FAQ ### What tools does UnderDefense use? As of October 2026, runsonwhat has found 35 tools at UnderDefense (underdefense.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Google Cloud. Application: jQuery, Google Fonts and YouTube. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: WordPress, Google Ads and Meta Pixel. Company Ops: Microsoft 365, Google Workspace and reCAPTCHA. Last checked October 19, 2026. ### What cloud does UnderDefense run on? UnderDefense uses Amazon Web Services for hosting and cloud infrastructure, alongside Google Cloud, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on underdefense.com. Amazon Web Services is used by 145,284 companies runsonwhat tracks. ### What CRM does UnderDefense use? UnderDefense uses HubSpot for its CRM, alongside Snov.io, according to runsonwhat (October 2026). runsonwhat found HubSpot through email records that authorize HubSpot and code on underdefense.com. HubSpot is used by 93,060 companies runsonwhat tracks. ### What email provider does UnderDefense use? UnderDefense uses Microsoft 365 for email and office software, alongside Google Workspace, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 706,417 companies runsonwhat tracks. ### What analytics tools does UnderDefense use? UnderDefense 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 underdefense.com. Google Analytics is used by 865,246 companies runsonwhat tracks. ### What is UnderDefense's website built with? UnderDefense uses WordPress for its website, alongside Yoast SEO, according to runsonwhat (October 2026). runsonwhat found WordPress through WordPress code on underdefense.com. WordPress is used by 589,089 companies runsonwhat tracks. ### Does UnderDefense use jQuery? Yes. runsonwhat found jQuery at UnderDefense through jQuery code on underdefense.com. jQuery is a Frontend tool used by 905,994 companies runsonwhat tracks. ### Does UnderDefense use AI tools? Yes. runsonwhat has found Anthropic and OpenAI at UnderDefense; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so UnderDefense may use more AI tools than these. ### Which companies have a tech stack similar to UnderDefense's? The companies with the stacks most like UnderDefense's are PROSTEP, Reg.ru, Linc AI and Ondaloop, according to runsonwhat (October 2026). Each shares 3 to 11 tools with UnderDefense, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what UnderDefense uses? runsonwhat reads public records only. Of the 35 tools at UnderDefense, 18 were found through code on underdefense.com, 11 through DNS records, 4 through email records and 2 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and underdefense.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/underdefense.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.