# What does Estuary use? Estuary (estuary.dev) shows public evidence of 33 tools, according to runsonwhat (last checked 2026-10-20). - Size: 11–50 employees - Based in: New York, United States - LinkedIn: https://www.linkedin.com/company/estuary-tech ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS verification records, DNS records, Email records, Website code | | | [Fastly](https://www.runsonwhat.com/reverse/fastly) | CDN & Edge | Website code | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Vimeo](https://www.runsonwhat.com/reverse/vimeo) | Media & UI | Website code | | | [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | DNS verification records | | | [Lottie](https://www.runsonwhat.com/reverse/lottie) | Media & UI | Website code | | | [Firebase](https://www.runsonwhat.com/reverse/firebase) | Backend & Database | DNS records, Website code | | | [Gatsby](https://www.runsonwhat.com/reverse/gatsby) | 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 | | | [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code | | | [PostHog](https://www.runsonwhat.com/reverse/posthog) | Analytics | Website code | | | [incident.io](https://www.runsonwhat.com/reverse/incidentio) | Monitoring | Custom domain | 2024-09 | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Ads](https://www.runsonwhat.com/reverse/google-ads) | 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 | | | [Zendesk](https://www.runsonwhat.com/reverse/zendesk) | Support & Docs | Website code | | | [Reddit Ads](https://www.runsonwhat.com/reverse/reddit-ads) | Ads & Pixels | Website code | | | [Short.io](https://www.runsonwhat.com/reverse/short-io) | Marketing | Custom domain | 2021-12 | | [Warmly](https://www.runsonwhat.com/reverse/warmly) | Sales & CRM | Website code | | | [Nooks](https://www.runsonwhat.com/reverse/nooks) | Sales & CRM | Custom domain | | ## 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 | | | [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records | | | [Let's Encrypt](https://www.runsonwhat.com/reverse/letsencrypt) | Security & Compliance | DNS records | | | [Sectigo](https://www.runsonwhat.com/reverse/sectigo) | Security & Compliance | DNS records | | | [DigiCert](https://www.runsonwhat.com/reverse/digicert) | Security & Compliance | DNS records | | | [Google Trust Services](https://www.runsonwhat.com/reverse/google-trust) | Security & Compliance | DNS records | | | [1Password](https://www.runsonwhat.com/reverse/1password) | Security & Compliance | DNS verification records | | | [Notion](https://www.runsonwhat.com/reverse/notion) | Collaboration | DNS verification records | | | [CookieFirst](https://www.runsonwhat.com/reverse/cookiefirst) | Security & Compliance | Website code | | ## Recent changes at Estuary - 2026-10-09: started using [Fastly](https://www.runsonwhat.com/reverse/fastly) - 2026-10-09: started using [Google Ads](https://www.runsonwhat.com/reverse/google-ads) - 2026-10-09: started using [Google Tag Manager](https://www.runsonwhat.com/reverse/gtm) - 2026-10-09: started using [llms.txt](https://www.runsonwhat.com/reverse/llms-txt) - 2026-10-09: started using [Nooks](https://www.runsonwhat.com/reverse/nooks) - 2026-10-09: started using [Reddit Ads](https://www.runsonwhat.com/reverse/reddit-ads) - 2026-10-09: started using [Vimeo](https://www.runsonwhat.com/reverse/vimeo) - 2026-10-09: started using [Warmly](https://www.runsonwhat.com/reverse/warmly) ## FAQ ### What tools does Estuary use? As of October 2026, runsonwhat has found 33 tools at Estuary (estuary.dev) in public records. Edge & Hosting: Cloudflare and Fastly. Application: Vimeo, React and Anthropic. Data & Observability: Google Analytics, Google Tag Manager and web-vitals. Go-to-market: Google Ads, LinkedIn Insight Tag and HubSpot. Company Ops: Microsoft 365, Google Workspace and Apple Business. Last checked October 20, 2026. ### What CRM does Estuary use? Estuary uses HubSpot for its CRM, alongside Warmly and Nooks, according to runsonwhat (October 2026). runsonwhat found HubSpot through email records that authorize HubSpot and code on estuary.dev. HubSpot is used by 93,924 companies runsonwhat tracks. ### What email provider does Estuary use? Estuary uses Microsoft 365 for email and office software, alongside Google Workspace and Apple Business, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 710,155 companies runsonwhat tracks. ### What does Estuary use for customer support? Estuary uses Zendesk for customer support and documentation, according to runsonwhat (October 2026). runsonwhat found Zendesk through Zendesk code on estuary.dev. Zendesk is used by 41,822 companies runsonwhat tracks. ### What analytics tools does Estuary use? Estuary uses Google Analytics for analytics, alongside Google Tag Manager and PostHog, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on estuary.dev. Google Analytics is used by 879,457 companies runsonwhat tracks. ### What marketing software does Estuary use? Estuary uses Short.io for marketing, according to runsonwhat (October 2026). runsonwhat found Short.io through a subdomain that points at Short.io, and Estuary has used it since at least December 2021. Short.io is used by 1,387 companies runsonwhat tracks. ### How long has Estuary used Short.io? Estuary has used Short.io since at least December 2021, going by the first public certificate of the estuary.dev subdomain that points at Short.io. Other long-running tools at Estuary include incident.io (since September 2024). ### Does Estuary use Cloudflare? Yes. runsonwhat found Cloudflare at Estuary through a DNS verification record for Cloudflare and DNS records. Cloudflare is a CDN & Edge tool used by 702,866 companies runsonwhat tracks. ### Does Estuary use AI tools? Yes. runsonwhat has found Anthropic and OpenAI at Estuary; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Estuary may use more AI tools than these. ### Has Estuary changed tools recently? Yes. On runsonwhat's rechecks, Estuary started using Fastly, Google Ads and Google Tag Manager (latest on October 9, 2026). A change counts only between two checks of estuary.dev done the same way. ### Which companies have a tech stack similar to Estuary's? The companies with the stacks most like Estuary's are GovDash, Reducto, Pallet and Instrumentl, according to runsonwhat (October 2026). Each shares 12 to 17 tools with Estuary, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Estuary uses? runsonwhat reads public records only. Of the 33 tools at Estuary, 15 were found through code on estuary.dev, 12 through DNS records, 3 through subdomains that point at the vendor, 2 through email records and 1 through website configuration files. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and estuary.dev about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/estuary.dev (updated October 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.