# What does CircleCI use? CircleCI (circleci.com) shows public evidence of 67 tools, according to runsonwhat (last checked 2026-10-20). - Industry: Software - Based in: United States - Founded: 2011 - LinkedIn: https://www.linkedin.com/company/circleci ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | Website code | | | [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Website code | | | [Amazon Route 53](https://www.runsonwhat.com/reverse/route53) | DNS | DNS records | | | [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Website code | | | [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | DNS verification records | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | Website code | | | [Vimeo](https://www.runsonwhat.com/reverse/vimeo) | Media & UI | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [Algolia](https://www.runsonwhat.com/reverse/algolia) | Search | Website code | | | [Auth0](https://www.runsonwhat.com/reverse/auth0) | Auth & Identity | Custom domain, Website config | 2017-04 | | [Smithery](https://www.runsonwhat.com/reverse/smithery) | AI | DNS verification records | | ## 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 | | | [Hotjar](https://www.runsonwhat.com/reverse/hotjar) | Analytics | Website code | | | [Datadog](https://www.runsonwhat.com/reverse/datadog) | Monitoring | Website code | | | [Optimizely](https://www.runsonwhat.com/reverse/optimizely) | Flags & Experiments | Website code | | | [Atlassian Statuspage](https://www.runsonwhat.com/reverse/statuspage) | Monitoring | Custom domain | 2016-11 | | [Segment](https://www.runsonwhat.com/reverse/segment) | Analytics | DNS verification records, Website code | | | [Amplitude](https://www.runsonwhat.com/reverse/amplitude) | Analytics | Website code | | | [Astronomer](https://www.runsonwhat.com/reverse/astronomer) | Data Pipeline | 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 | | | [Microsoft Ads](https://www.runsonwhat.com/reverse/bing-ads) | Ads & Pixels | Website code | | | [Mailchimp](https://www.runsonwhat.com/reverse/mailchimp) | Marketing | Email records | | | [LinkedIn Insight Tag](https://www.runsonwhat.com/reverse/linkedin-insight) | Ads & Pixels | Website code | | | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | DNS verification records, Website code | | | [Microsoft Xandr](https://www.runsonwhat.com/reverse/xandr) | 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 | | | [ZoomInfo](https://www.runsonwhat.com/reverse/zoominfo) | Sales & CRM | Website code | | | [StackAdapt](https://www.runsonwhat.com/reverse/stackadapt) | Ads & Pixels | Website code | | | [Marketo](https://www.runsonwhat.com/reverse/marketo) | Marketing | Website code | | | [Intercom](https://www.runsonwhat.com/reverse/intercom) | Support & Docs | Custom domain | 2017-08 | | [Bombora](https://www.runsonwhat.com/reverse/bombora) | Sales & CRM | Website code | | | [LiveIntent](https://www.runsonwhat.com/reverse/liveintent) | Ads & Pixels | Website code | | | [Clickagy](https://www.runsonwhat.com/reverse/clickagy) | Sales & CRM | Website code | | | [Contentful](https://www.runsonwhat.com/reverse/contentful) | Website & CMS | Website code | | | [6sense](https://www.runsonwhat.com/reverse/sixsense) | Sales & CRM | Website code | | | [RB2B](https://www.runsonwhat.com/reverse/rb2b) | Sales & CRM | Website code | | | [Qualified](https://www.runsonwhat.com/reverse/qualified) | Sales & CRM | Website code | | | [Drift](https://www.runsonwhat.com/reverse/drift) | Support & Docs | DNS verification records | | | [Warmly](https://www.runsonwhat.com/reverse/warmly) | Sales & CRM | Website code | | | [Reo.dev](https://www.runsonwhat.com/reverse/reo) | Sales & CRM | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records | | | [reCAPTCHA](https://www.runsonwhat.com/reverse/recaptcha) | Security & Compliance | Website code | | | [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records | | | [Cookiebot](https://www.runsonwhat.com/reverse/cookiebot) | Security & Compliance | Website code | | | [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records | | | [Proofpoint](https://www.runsonwhat.com/reverse/proofpoint) | Security & Compliance | Email records | | | [Mailgun](https://www.runsonwhat.com/reverse/mailgun) | Email Delivery | DNS verification records | | | [Adobe](https://www.runsonwhat.com/reverse/adobe) | Collaboration | DNS verification records | | | [DocuSign](https://www.runsonwhat.com/reverse/docusign) | Finance & Legal | DNS verification records, Website code | | | [Zoom](https://www.runsonwhat.com/reverse/zoom) | Collaboration | DNS verification records | | | [Jamf](https://www.runsonwhat.com/reverse/jamf) | Security & Compliance | DNS verification records | | | [Cursor](https://www.runsonwhat.com/reverse/cursor) | Dev Tools | DNS verification records | | | [Box](https://www.runsonwhat.com/reverse/box) | Collaboration | DNS verification records | | | [Dropbox](https://www.runsonwhat.com/reverse/dropbox) | Collaboration | DNS verification records, Website code | | | [Docker](https://www.runsonwhat.com/reverse/docker) | Dev Tools | DNS verification records | | | [Postman](https://www.runsonwhat.com/reverse/postman) | Dev Tools | DNS verification records | | | [Greenhouse](https://www.runsonwhat.com/reverse/greenhouse) | People & HR | Website code | | | [SafeBase](https://www.runsonwhat.com/reverse/safebase) | Security & Compliance | Custom domain | 2023-07 | | [Linear](https://www.runsonwhat.com/reverse/linear) | Dev Tools | DNS verification records | | | [Maven Central](https://www.runsonwhat.com/reverse/maven-central) | Dev Tools | DNS verification records | | ## Hiring at CircleCI 13 open roles on its public job board: Sales 5, Engineering 3, Finance & Legal 1, Marketing 1, Operations 1, Other 1. ## FAQ ### What tools does CircleCI use? As of October 2026, runsonwhat has found 67 tools at CircleCI (circleci.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon Route 53. Application: Google Fonts, Vimeo and Anthropic. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Google Ads, Meta Pixel and Microsoft Ads. Company Ops: Google Workspace, reCAPTCHA and Apple Business. Last checked October 20, 2026. ### What cloud does CircleCI run on? CircleCI uses Amazon Web Services for hosting and cloud infrastructure, alongside Vercel, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on circleci.com. Amazon Web Services is used by 145,217 companies runsonwhat tracks. ### What CRM does CircleCI use? CircleCI uses HubSpot for its CRM, alongside ZoomInfo, Bombora and Clickagy, according to runsonwhat (October 2026). runsonwhat found HubSpot through a DNS verification record for HubSpot and code on circleci.com. HubSpot is used by 92,885 companies runsonwhat tracks. ### What email provider does CircleCI use? CircleCI uses Google Workspace for email and office software, alongside Apple Business, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace. Google Workspace is used by 399,976 companies runsonwhat tracks. ### What does CircleCI use for customer support? CircleCI uses Intercom for customer support and documentation, alongside Drift, according to runsonwhat (October 2026). runsonwhat found Intercom through a subdomain that points at Intercom, and CircleCI has used it since at least August 2017. Intercom is used by 8,495 companies runsonwhat tracks. ### What analytics tools does CircleCI use? CircleCI uses Google Analytics for analytics, alongside Google Tag Manager, Microsoft Clarity and Hotjar, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on circleci.com. Google Analytics is used by 862,985 companies runsonwhat tracks. ### How long has CircleCI used Atlassian Statuspage? CircleCI has used Atlassian Statuspage since at least November 2016, going by the first public certificate of the circleci.com subdomain that points at Atlassian Statuspage. Other long-running tools at CircleCI include Auth0 (since April 2017), Intercom (since August 2017) and SafeBase (since July 2023). ### Does CircleCI use Google Fonts? Yes. runsonwhat found Google Fonts at CircleCI through Google Fonts code on circleci.com. Google Fonts is a Media & UI tool used by 798,432 companies runsonwhat tracks. ### Does CircleCI use AI tools? Yes. runsonwhat has found Anthropic and Smithery at CircleCI; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so CircleCI may use more AI tools than these. ### Is CircleCI hiring? Yes. As of October 2026, CircleCI has 13 open roles on its public Greenhouse job board, most in sales (5), engineering (3) and finance & legal (1). 2 were posted in the last 30 days and 1 were taken down. ### Which companies have a tech stack similar to CircleCI's? The companies with the stacks most like CircleCI's are OUMI PBC, Opsera, Coder and Temporal, according to runsonwhat (October 2026). Each shares 15 to 32 tools with CircleCI, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what CircleCI uses? runsonwhat reads public records only. Of the 67 tools at CircleCI, 36 were found through code on circleci.com, 23 through DNS records, 4 through subdomains that point at the vendor, 3 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 circleci.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/circleci.com (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.