# What does GPTZero use? GPTZero (gptzero.me) shows public evidence of 26 tools, according to runsonwhat (last checked 2026-11-08). - Industry: Software - Size: 11–50 employees - Based in: New York, United States - LinkedIn: https://www.linkedin.com/company/gptzero ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Website code | | | [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Custom domain | 2023-08 | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [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 | | ## 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 | | | [Sentry](https://www.runsonwhat.com/reverse/sentry) | Monitoring | Website code | | | [Hotjar](https://www.runsonwhat.com/reverse/hotjar) | Analytics | Website code | | | [Amplitude](https://www.runsonwhat.com/reverse/amplitude) | Analytics | Website code | | | [GrowthBook](https://www.runsonwhat.com/reverse/growthbook) | Flags & Experiments | Website code | | ## 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 | | | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Email records, Website code | | | [TikTok Pixel](https://www.runsonwhat.com/reverse/tiktok-pixel) | Ads & Pixels | Website code | | | [Zendesk](https://www.runsonwhat.com/reverse/zendesk) | Support & Docs | Email records, Website code | | | [Rewardful](https://www.runsonwhat.com/reverse/rewardful) | Marketing | Website code | | ## 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 | | | [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records | | | [Postmark](https://www.runsonwhat.com/reverse/postmark) | Email Delivery | Email records | | | [Termly](https://www.runsonwhat.com/reverse/termly) | Security & Compliance | Website code | | | [Rippling](https://www.runsonwhat.com/reverse/rippling) | People & HR | DNS verification records | | ## FAQ ### What tools does GPTZero use? As of November 2026, runsonwhat has found 26 tools at GPTZero (gptzero.me) in public records. Edge & Hosting: Cloudflare and Amazon CloudFront. Application: React, Tailwind CSS and Anthropic. Data & Observability: Google Analytics, Google Tag Manager and Sentry. Go-to-market: Google Ads, Meta Pixel and LinkedIn Insight Tag. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked November 8, 2026. ### What CRM does GPTZero use? GPTZero uses HubSpot for its CRM, according to runsonwhat (November 2026). runsonwhat found HubSpot through email records that authorize HubSpot and code on gptzero.me. HubSpot is used by 97,448 companies runsonwhat tracks. ### What email provider does GPTZero use? GPTZero uses Microsoft 365 for email and office software, alongside Google Workspace, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 732,285 companies runsonwhat tracks. ### What does GPTZero use for customer support? GPTZero uses Zendesk for customer support and documentation, according to runsonwhat (November 2026). runsonwhat found Zendesk through email records that authorize Zendesk and code on gptzero.me. Zendesk is used by 43,556 companies runsonwhat tracks. ### What analytics tools does GPTZero use? GPTZero uses Google Analytics for analytics, alongside Google Tag Manager, Hotjar and Amplitude, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on gptzero.me. Google Analytics is used by 903,824 companies runsonwhat tracks. ### What marketing software does GPTZero use? GPTZero uses Rewardful for marketing, according to runsonwhat (November 2026). runsonwhat found Rewardful through Rewardful code on gptzero.me. Rewardful is used by 1,956 companies runsonwhat tracks. ### How long has GPTZero used Amazon CloudFront? GPTZero has used Amazon CloudFront since at least August 2023, going by the first public certificate of the gptzero.me subdomain that points at Amazon CloudFront. ### Does GPTZero use Cloudflare? Yes. runsonwhat found Cloudflare at GPTZero through DNS records that point at Cloudflare and code on gptzero.me. Cloudflare is a CDN & Edge tool used by 732,226 companies runsonwhat tracks. ### Does GPTZero use AI tools? Yes. runsonwhat has found Anthropic at GPTZero; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so GPTZero may use more AI tools than these. ### Which companies have a tech stack similar to GPTZero's? The companies with the stacks most like GPTZero's are Galvin for Men, Swordnarmory, Litejoy and Olloïs, according to runsonwhat (November 2026). Each shares 4 to 10 tools with GPTZero, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what GPTZero uses? runsonwhat reads public records only. Of the 26 tools at GPTZero, 15 were found through code on gptzero.me, 5 through DNS records, 5 through email records and 1 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and gptzero.me about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/gptzero.me (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.