# What does CheckSammy use? CheckSammy (checksammy.com) shows public evidence of 43 tools, according to runsonwhat (last checked 2026-11-12). - Industry: Environmental Services - Size: 51–200 employees - Based in: Dallas, United States - Founded: 2018 - LinkedIn: https://www.linkedin.com/company/checksammy ## 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 | Custom domain | 2026-03 | | [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS verification records, DNS records, Website code | 2024-06 | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | Website code | | | [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code | | | [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code | | | [Mapbox](https://www.runsonwhat.com/reverse/mapbox) | Media & UI | Website code | | | [Stytch](https://www.runsonwhat.com/reverse/stytch) | Auth & Identity | Custom domain, DNS verification records | 2025-11 | ## 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 | | | [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code | | | [PostHog](https://www.runsonwhat.com/reverse/posthog) | Analytics | Website code | | | [incident.io](https://www.runsonwhat.com/reverse/incidentio) | Monitoring | Custom domain | 2026-03 | ## 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 | | | [LinkedIn Insight Tag](https://www.runsonwhat.com/reverse/linkedin-insight) | Ads & Pixels | Website code | | | [Microsoft Ads](https://www.runsonwhat.com/reverse/bing-ads) | Ads & Pixels | Website code | | | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Custom domain, Email records, Website code | 2023-11 | | [HubSpot CMS](https://www.runsonwhat.com/reverse/hubspot-cms) | Website & CMS | Custom domain | 2023-11 | | [ChatGPT Ads](https://www.runsonwhat.com/reverse/chatgpt-ads) | Ads & Pixels | Website code | | | [LiveRamp](https://www.runsonwhat.com/reverse/liveramp) | Ads & Pixels | Website code | | | [Adobe Audience Manager](https://www.runsonwhat.com/reverse/adobe-audience-manager) | Ads & Pixels | Website code | | | [Freshdesk](https://www.runsonwhat.com/reverse/freshdesk) | Support & Docs | Custom domain | 2025-03 | | [Bombora](https://www.runsonwhat.com/reverse/bombora) | Sales & CRM | Website code | | | [Sanity](https://www.runsonwhat.com/reverse/sanity) | Website & CMS | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | Email records, Website code | | | [reCAPTCHA](https://www.runsonwhat.com/reverse/recaptcha) | Security & Compliance | Website code | | | [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records, Website code | | | [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records | | | [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 | | | [Resend](https://www.runsonwhat.com/reverse/resend) | Email Delivery | Email records | | | [EasyDMARC](https://www.runsonwhat.com/reverse/easydmarc) | Security & Compliance | Email records | | | [Amazon Trust Services](https://www.runsonwhat.com/reverse/amazon-trust) | Security & Compliance | DNS records | | | [Have I Been Pwned](https://www.runsonwhat.com/reverse/hibp) | Security & Compliance | DNS verification records | | | [Notion](https://www.runsonwhat.com/reverse/notion) | Collaboration | DNS verification records | | | [Linear](https://www.runsonwhat.com/reverse/linear) | Dev Tools | DNS verification records | | ## Recent changes at CheckSammy - 2026-11-12: started using [Anthropic](https://www.runsonwhat.com/reverse/anthropic) ## FAQ ### What tools does CheckSammy use? As of November 2026, runsonwhat has found 43 tools at CheckSammy (checksammy.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Vercel. Application: Google Fonts, React and Tailwind CSS. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Google Ads, Meta Pixel and LinkedIn Insight Tag. Company Ops: Microsoft 365, reCAPTCHA and SendGrid. Last checked November 12, 2026. ### What cloud does CheckSammy run on? CheckSammy uses Amazon Web Services for hosting and cloud infrastructure, alongside Vercel, according to runsonwhat (November 2026). runsonwhat found Amazon Web Services through a subdomain that points at Amazon Web Services, and CheckSammy has used it since at least March 2026. Amazon Web Services is used by 147,631 companies runsonwhat tracks. ### What CRM does CheckSammy use? CheckSammy uses HubSpot for its CRM, alongside Bombora, according to runsonwhat (November 2026). runsonwhat found HubSpot through a subdomain that points at HubSpot and email records, and CheckSammy has used it since at least November 2023. HubSpot is used by 97,930 companies runsonwhat tracks. ### What email provider does CheckSammy use? CheckSammy uses Microsoft 365 for email and office software, alongside Apple Business, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through email records that authorize Microsoft 365 and code on checksammy.com. Microsoft 365 is used by 736,662 companies runsonwhat tracks. ### What does CheckSammy use for customer support? CheckSammy uses Freshdesk for customer support and documentation, according to runsonwhat (November 2026). runsonwhat found Freshdesk through a subdomain that points at Freshdesk, and CheckSammy has used it since at least March 2025. Freshdesk is used by 13,024 companies runsonwhat tracks. ### What analytics tools does CheckSammy use? CheckSammy uses Google Analytics for analytics, alongside Google Tag Manager, Microsoft Clarity and PostHog, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on checksammy.com. Google Analytics is used by 904,030 companies runsonwhat tracks. ### How long has CheckSammy used HubSpot? CheckSammy has used HubSpot since at least November 2023, going by the first public certificate of the checksammy.com subdomain that points at HubSpot. Other long-running tools at CheckSammy include HubSpot CMS (since November 2023), Vercel (since June 2024) and Freshdesk (since March 2025). ### Does CheckSammy use Google Fonts? Yes. runsonwhat found Google Fonts at CheckSammy through Google Fonts code on checksammy.com. Google Fonts is a Media & UI tool used by 825,709 companies runsonwhat tracks. ### Does CheckSammy use AI tools? Yes. runsonwhat has found Anthropic at CheckSammy; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so CheckSammy may use more AI tools than these. ### Has CheckSammy changed tools recently? Yes. On runsonwhat's rechecks, CheckSammy started using Anthropic (latest on November 12, 2026). A change counts only between two checks of checksammy.com done the same way. ### Which companies have a tech stack similar to CheckSammy's? The companies with the stacks most like CheckSammy's are Heron, Zapier, Pioneer Works and Enode, according to runsonwhat (November 2026). Each shares 12 to 26 tools with CheckSammy, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what CheckSammy uses? runsonwhat reads public records only. Of the 43 tools at CheckSammy, 20 were found through code on checksammy.com, 12 through DNS records, 7 through subdomains that point at the vendor and 4 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and checksammy.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/checksammy.com (updated November 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.