# What does EF use? EF (ef.fr) shows public evidence of 26 tools, according to runsonwhat (last checked 2026-10-30). - Industry: Leisure, Travel & Tourism - Size: 11–50 employees - Based in: Offenburg, Germany - LinkedIn: https://www.linkedin.com/company/ef-s%C3%A9jours-linguistiques ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Website code | | | [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Website code | | | [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Website code | | ## 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 | | | [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code | | | [Chatbase](https://www.runsonwhat.com/reverse/chatbase) | AI | 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 | | | [Microsoft Clarity](https://www.runsonwhat.com/reverse/clarity) | Analytics | Website code | | | [Hotjar](https://www.runsonwhat.com/reverse/hotjar) | Analytics | Website code | | | [Optimizely](https://www.runsonwhat.com/reverse/optimizely) | Flags & Experiments | Website code | | | [BlueConic](https://www.runsonwhat.com/reverse/blueconic) | Data Pipeline | 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 | | | [Microsoft Ads](https://www.runsonwhat.com/reverse/bing-ads) | Ads & Pixels | Website code | | | [Pinterest](https://www.runsonwhat.com/reverse/pinterest) | Ads & Pixels | Website code | | | [ChatGPT Ads](https://www.runsonwhat.com/reverse/chatgpt-ads) | Ads & Pixels | Website code | | | [Reddit Ads](https://www.runsonwhat.com/reverse/reddit-ads) | Ads & Pixels | Website code | | | [Trustpilot](https://www.runsonwhat.com/reverse/trustpilot) | Marketing | Website code | | | [Snap Pixel](https://www.runsonwhat.com/reverse/snap-pixel) | Ads & Pixels | Website code | | | [Storyblok](https://www.runsonwhat.com/reverse/storyblok) | Website & CMS | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records, Email records, Website code | | | [OneTrust](https://www.runsonwhat.com/reverse/onetrust) | Security & Compliance | Website code | | ## FAQ ### What tools does EF use? As of November 2026, runsonwhat has found 26 tools at EF (ef.fr) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon CloudFront. Application: React, Tailwind CSS and Next.js. 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 and OneTrust. Last checked October 30, 2026. ### What cloud does EF run on? EF uses Amazon Web Services for hosting and cloud infrastructure, according to runsonwhat (November 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on ef.fr. Amazon Web Services is used by 146,727 companies runsonwhat tracks. ### What email provider does EF use? EF uses Microsoft 365 for email and office software, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365 and email records. Microsoft 365 is used by 719,578 companies runsonwhat tracks. ### What analytics tools does EF use? EF 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 ef.fr. Google Analytics is used by 906,355 companies runsonwhat tracks. ### What is EF's website built with? EF uses Storyblok for its website, according to runsonwhat (November 2026). runsonwhat found Storyblok through Storyblok code on ef.fr. Storyblok is used by 2,773 companies runsonwhat tracks. ### What marketing software does EF use? EF uses Trustpilot for marketing, according to runsonwhat (November 2026). runsonwhat found Trustpilot through Trustpilot code on ef.fr. Trustpilot is used by 16,355 companies runsonwhat tracks. ### Does EF use Cloudflare? Yes. runsonwhat found Cloudflare at EF through DNS records that point at Cloudflare and code on ef.fr. Cloudflare is a CDN & Edge tool used by 724,489 companies runsonwhat tracks. ### Does EF use AI tools? Yes. runsonwhat has found Chatbase at EF; Chatbase, for example, through Chatbase code on ef.fr. AI services called only from servers leave no public trace, so EF may use more AI tools than these. ### Which companies have a tech stack similar to EF's? The companies with the stacks most like EF's are Ef Efekta English For Adults, EF, Broadway Veterinary Hospital and Convertiv, according to runsonwhat (November 2026). Each shares 8 to 26 tools with EF, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what EF uses? runsonwhat reads public records only. Of the 26 tools at EF, 23 were found through code on ef.fr, 3 through DNS records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and ef.fr about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/ef.fr (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.