# What does Rex use? Rex (rex.app) shows public evidence of 24 tools, according to runsonwhat (last checked 2026-10-30). - Industry: Veterinary - Size: 11–50 employees - Based in: Germany - Founded: 2021 - LinkedIn: https://www.linkedin.com/company/rex-app ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Email records, Website code | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [jQuery](https://www.runsonwhat.com/reverse/jquery) | Frontend | Website code | | | [Stripe](https://www.runsonwhat.com/reverse/stripe) | Payments & Billing | DNS verification records, Website code | | | [Firebase](https://www.runsonwhat.com/reverse/firebase) | Backend & Database | Custom domain | | ## 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 | | | [Intellimize](https://www.runsonwhat.com/reverse/intellimize) | 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 | DNS verification records, 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 | | | [Brevo](https://www.runsonwhat.com/reverse/brevo) | Marketing | DNS verification records | | | [TikTok Pixel](https://www.runsonwhat.com/reverse/tiktok-pixel) | Ads & Pixels | Website code | | | [Webflow](https://www.runsonwhat.com/reverse/webflow) | Website & CMS | DNS verification records, Website code | | | [ChatGPT Ads](https://www.runsonwhat.com/reverse/chatgpt-ads) | Ads & Pixels | Website code | | | [Snap Pixel](https://www.runsonwhat.com/reverse/snap-pixel) | Ads & Pixels | Website code | | | [Chatwoot](https://www.runsonwhat.com/reverse/chatwoot) | Support & Docs | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [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 | | | [Valimail](https://www.runsonwhat.com/reverse/valimail) | Security & Compliance | Email records | | | [iubenda](https://www.runsonwhat.com/reverse/iubenda) | Security & Compliance | Website code | | ## FAQ ### What tools does Rex use? As of November 2026, runsonwhat has found 24 tools at Rex (rex.app) in public records. Edge & Hosting: Cloudflare. Application: jQuery, Stripe and Firebase. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Google Ads, Meta Pixel and LinkedIn Insight Tag. Company Ops: Google Workspace, SendGrid and Valimail. Last checked October 30, 2026. ### What email provider does Rex use? Rex uses Google Workspace for email and office software, according to runsonwhat (November 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on rex.app. Google Workspace is used by 411,037 companies runsonwhat tracks. ### What does Rex use for customer support? Rex uses Chatwoot for customer support and documentation, according to runsonwhat (November 2026). runsonwhat found Chatwoot through Chatwoot code on rex.app. Chatwoot is used by 993 companies runsonwhat tracks. ### What payment provider does Rex use? Rex uses Stripe for payments and billing, according to runsonwhat (November 2026). runsonwhat found Stripe through a DNS verification record for Stripe and code on rex.app. Stripe is used by 30,920 companies runsonwhat tracks. ### What analytics tools does Rex use? Rex uses Google Analytics for analytics, alongside Google Tag Manager, Microsoft Clarity and Hotjar, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on rex.app. Google Analytics is used by 906,435 companies runsonwhat tracks. ### What is Rex's website built with? Rex uses Webflow for its website, according to runsonwhat (November 2026). runsonwhat found Webflow through a DNS verification record for Webflow and code on rex.app. Webflow is used by 35,674 companies runsonwhat tracks. ### Does Rex use jQuery? Yes. runsonwhat found jQuery at Rex through jQuery code on rex.app. jQuery is a Frontend tool used by 930,265 companies runsonwhat tracks. ### Which companies have a tech stack similar to Rex's? The companies with the stacks most like Rex's are Softcontrol, International British Online School, Hoboken Grace and Ariyes Lda, according to runsonwhat (November 2026). Each shares 5 to 12 tools with Rex, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Rex uses? runsonwhat reads public records only. Of the 24 tools at Rex, 14 were found through code on rex.app, 6 through DNS records, 3 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 rex.app about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/rex.app (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.