What does GPTZero use?

As of October 2026, runsonwhat has found 26 tools at GPTZero (gptzero.me) in public records. Edge & Hosting: Cloudflare and Amazon CloudFront. Application: React, Tailwind CSS and Next.js. 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 October 20, 2026.

GPTZero uses HubSpot for its CRM, according to runsonwhat (October 2026). runsonwhat found HubSpot through email records that authorize HubSpot and code on gptzero.me. HubSpot is used by 94,484 companies runsonwhat tracks.

GPTZero 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 713,653 companies runsonwhat tracks.

GPTZero uses Zendesk for customer support and documentation, according to runsonwhat (October 2026). runsonwhat found Zendesk through email records that authorize Zendesk and code on gptzero.me. Zendesk is used by 42,116 companies runsonwhat tracks.

GPTZero uses Google Analytics for analytics, alongside Google Tag Manager, Hotjar and Amplitude, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on gptzero.me. Google Analytics is used by 885,940 companies runsonwhat tracks.

GPTZero uses Rewardful for marketing, according to runsonwhat (October 2026). runsonwhat found Rewardful through Rewardful code on gptzero.me. Rewardful is used by 1,913 companies runsonwhat tracks.

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 706,378 companies runsonwhat tracks.

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.

The companies with the stacks most like GPTZero's are Join, Mention, Precisely and Alura Latam, according to runsonwhat (October 2026). Each shares 7 to 15 tools with GPTZero, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

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.