# What does Zeffy use? Zeffy (zeffy.com) shows public evidence of 43 tools, according to runsonwhat (last checked 2026-11-06). - Industry: Software - Size: 11–50 employees - Based in: Montreal, Canada - Founded: 2015 - LinkedIn: https://www.linkedin.com/company/zeffy ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Email records, Website code | | | [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS verification records | | | [Fly.io](https://www.runsonwhat.com/reverse/fly) | Hosting & Cloud | Custom domain | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [jQuery](https://www.runsonwhat.com/reverse/jquery) | Frontend | Website code | | | [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [PayPal](https://www.runsonwhat.com/reverse/paypal) | Payments & Billing | Website code | | | [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | DNS verification records | | | [Lottie](https://www.runsonwhat.com/reverse/lottie) | Media & UI | Website code | | | [Wistia](https://www.runsonwhat.com/reverse/wistia) | Media & UI | Website code | | | [Stytch](https://www.runsonwhat.com/reverse/stytch) | Auth & Identity | DNS verification records, 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 | | | [Sentry](https://www.runsonwhat.com/reverse/sentry) | Monitoring | Website code | | | [Amplitude](https://www.runsonwhat.com/reverse/amplitude) | Analytics | Website code | | | [Intellimize](https://www.runsonwhat.com/reverse/intellimize) | Flags & Experiments | Website code | | | [Site24x7](https://www.runsonwhat.com/reverse/site24x7) | Monitoring | DNS verification records | | ## 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 | Email records, 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 | 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 | | | [LinkedIn](https://www.runsonwhat.com/reverse/linkedin) | Marketing | DNS verification records | | | [StackAdapt](https://www.runsonwhat.com/reverse/stackadapt) | Ads & Pixels | Website code | | | [Amazon Advertising](https://www.runsonwhat.com/reverse/amazon-advertising) | Ads & Pixels | Website code | | | [G2](https://www.runsonwhat.com/reverse/g2) | Marketing | Website code | | | [Magellan AI](https://www.runsonwhat.com/reverse/magellan-ai) | Ads & Pixels | Website code | | | [PartnerStack](https://www.runsonwhat.com/reverse/partnerstack) | Marketing | Website code | | | [Tolt](https://www.runsonwhat.com/reverse/tolt) | Marketing | Website code | | | [Forethought](https://www.runsonwhat.com/reverse/forethought) | Support & Docs | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code | | | [Cookiebot](https://www.runsonwhat.com/reverse/cookiebot) | Security & Compliance | Website code | | | [Cloudflare Turnstile](https://www.runsonwhat.com/reverse/turnstile) | Security & Compliance | Website code | | | [HubSpot App Developer](https://www.runsonwhat.com/reverse/hubspot-developer) | Dev Tools | DNS verification records | | | [Greenhouse](https://www.runsonwhat.com/reverse/greenhouse) | People & HR | Email records | | | [Loom](https://www.runsonwhat.com/reverse/loom) | Collaboration | Website code | | ## Recent changes at Zeffy - 2026-10-30: stopped using [Mouseflow](https://www.runsonwhat.com/reverse/mouseflow) - 2026-10-30: started using again [Fly.io](https://www.runsonwhat.com/reverse/fly) - 2026-10-30: stopped using [Fly.io](https://www.runsonwhat.com/reverse/fly) - 2026-10-20: started using again [Fly.io](https://www.runsonwhat.com/reverse/fly) - 2026-10-20: stopped using [Fly.io](https://www.runsonwhat.com/reverse/fly) - 2026-10-09: started using again [Fly.io](https://www.runsonwhat.com/reverse/fly) - 2026-10-09: started using [Site24x7](https://www.runsonwhat.com/reverse/site24x7) - 2026-10-09: stopped using [Fly.io](https://www.runsonwhat.com/reverse/fly) ## FAQ ### What tools does Zeffy use? As of November 2026, runsonwhat has found 43 tools at Zeffy (zeffy.com) in public records. Edge & Hosting: Cloudflare, Vercel and Fly.io. Application: jQuery, Google Fonts and Anthropic. 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, Cookiebot and Cloudflare Turnstile. Last checked November 6, 2026. ### What cloud does Zeffy run on? Zeffy uses Vercel for hosting and cloud infrastructure, alongside Fly.io, according to runsonwhat (November 2026). runsonwhat found Vercel through a subdomain that points at Vercel and a DNS verification record. Vercel is used by 52,916 companies runsonwhat tracks. ### What CRM does Zeffy use? Zeffy uses HubSpot for its CRM, according to runsonwhat (November 2026). runsonwhat found HubSpot through email records that authorize HubSpot and code on zeffy.com. HubSpot is used by 97,452 companies runsonwhat tracks. ### What email provider does Zeffy use? Zeffy 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 zeffy.com. Google Workspace is used by 419,238 companies runsonwhat tracks. ### What does Zeffy use for customer support? Zeffy uses Forethought for customer support and documentation, according to runsonwhat (November 2026). runsonwhat found Forethought through Forethought code on zeffy.com. Forethought is used by 41 companies runsonwhat tracks. ### What payment provider does Zeffy use? Zeffy uses PayPal for payments and billing, according to runsonwhat (November 2026). runsonwhat found PayPal through PayPal code on zeffy.com. PayPal is used by 35,169 companies runsonwhat tracks. ### Does Zeffy use jQuery? Yes. runsonwhat found jQuery at Zeffy through jQuery code on zeffy.com. jQuery is a Frontend tool used by 927,187 companies runsonwhat tracks. ### Does Zeffy use AI tools? Yes. runsonwhat has found Anthropic and OpenAI at Zeffy; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Zeffy may use more AI tools than these. ### Has Zeffy changed tools recently? Yes. On runsonwhat's rechecks, Zeffy started using Fly.io (latest on October 30, 2026) and stopped using Mouseflow and Fly.io (latest on October 30, 2026). A change counts only between two checks of zeffy.com done the same way. ### Which companies have a tech stack similar to Zeffy's? The companies with the stacks most like Zeffy's are ActiveCampaign, Firstbase.io, BoxFort and folk, according to runsonwhat (November 2026). Each shares 12 to 18 tools with Zeffy, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Zeffy uses? runsonwhat reads public records only. Of the 43 tools at Zeffy, 29 were found through code on zeffy.com, 9 through DNS records, 3 through email records and 2 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and zeffy.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/zeffy.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.