# What does Certain, Inc. use? Certain, Inc. (certain.com) shows public evidence of 35 tools, according to runsonwhat (last checked 2026-10-07). - Industry: Internet - Size: 51–200 employees - Based in: San Francisco, United States - Founded: 1994 - LinkedIn: https://www.linkedin.com/company/certain-inc ## 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 | Custom domain | 2016-07 | | [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Custom domain | 2025-05 | | [WP Engine](https://www.runsonwhat.com/reverse/wpengine) | Hosting & Cloud | Custom domain | 2022-02 | ## 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 | | | [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code | | | [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [Supabase](https://www.runsonwhat.com/reverse/supabase) | Backend & Database | Website code | | ## Data & Observability | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code | | | [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code | | | [Atlassian Statuspage](https://www.runsonwhat.com/reverse/statuspage) | Monitoring | Custom domain | 2021-03 | | [Tinybird](https://www.runsonwhat.com/reverse/tinybird) | Analytics | Website code | | | [CloudHealth](https://www.runsonwhat.com/reverse/cloudhealth) | Monitoring | DNS verification records | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [Zendesk](https://www.runsonwhat.com/reverse/zendesk) | Support & Docs | Email records, Website code | | | [Calendly](https://www.runsonwhat.com/reverse/calendly) | Sales & CRM | Website code | | | [Pardot](https://www.runsonwhat.com/reverse/pardot) | Marketing | Custom domain, DNS verification records, Email records, Website code | 2020-01 | | [Apollo.io](https://www.runsonwhat.com/reverse/apollo) | Sales & CRM | Website code | | | [Demandbase](https://www.runsonwhat.com/reverse/demandbase) | Sales & CRM | Website code | | | [LiveIntent](https://www.runsonwhat.com/reverse/liveintent) | Ads & Pixels | Website code | | | [Navattic](https://www.runsonwhat.com/reverse/navattic) | Marketing | Website code | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | Email records, DNS verification records, Website code | | | [reCAPTCHA](https://www.runsonwhat.com/reverse/recaptcha) | Security & Compliance | Website code | | | [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Custom domain, Email records, Website code | | | [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records | | | [GlobalSign](https://www.runsonwhat.com/reverse/globalsign) | Security & Compliance | DNS verification records | | | [OneTrust](https://www.runsonwhat.com/reverse/onetrust) | Security & Compliance | DNS verification records | | | [Adobe](https://www.runsonwhat.com/reverse/adobe) | Collaboration | DNS verification records | | | [Zoom](https://www.runsonwhat.com/reverse/zoom) | Collaboration | DNS verification records | | | [Webex](https://www.runsonwhat.com/reverse/webex) | Collaboration | DNS verification records | | | [Sage Intacct](https://www.runsonwhat.com/reverse/sage-intacct) | Finance & Legal | DNS verification records, Email records | | | [Lovable](https://www.runsonwhat.com/reverse/lovable) | Dev Tools | DNS verification records | | ## FAQ ### What tools does Certain use? As of October 2026, runsonwhat has found 35 tools at Certain (certain.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon CloudFront. Application: Google Fonts, Vimeo and React. Data & Observability: Google Analytics, web-vitals and Atlassian Statuspage. Go-to-market: Zendesk, Calendly and Pardot. Company Ops: Microsoft 365, reCAPTCHA and SendGrid. Last checked October 7, 2026. ### What cloud does Certain run on? Certain uses Amazon Web Services for hosting and cloud infrastructure, alongside WP Engine, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through a subdomain that points at Amazon Web Services, and Certain has used it since at least July 2016. Amazon Web Services is used by 144,158 companies runsonwhat tracks. ### What sales tools does Certain use? The sales tools runsonwhat has found at Certain are Calendly, Apollo.io and Demandbase (October 2026); no CRM shows up in Certain's public records. runsonwhat found Calendly through Calendly code on certain.com. ### What email provider does Certain use? Certain uses Microsoft 365 for email and office software, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through email records that authorize Microsoft 365 and a DNS verification record. Microsoft 365 is used by 694,651 companies runsonwhat tracks. ### What does Certain use for customer support? Certain uses Zendesk for customer support and documentation, according to runsonwhat (October 2026). runsonwhat found Zendesk through email records that authorize Zendesk and code on certain.com. Zendesk is used by 40,280 companies runsonwhat tracks. ### What analytics tools does Certain use? Certain uses Google Analytics for analytics, alongside Tinybird, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on certain.com. Google Analytics is used by 835,893 companies runsonwhat tracks. ### How long has Certain used Amazon Web Services? Certain has used Amazon Web Services since at least July 2016, going by the first public certificate of the certain.com subdomain that points at Amazon Web Services. Other long-running tools at Certain include Pardot (since January 2020), Atlassian Statuspage (since March 2021) and WP Engine (since February 2022). ### Does Certain use Google Fonts? Yes. runsonwhat found Google Fonts at Certain through Google Fonts code on certain.com. Google Fonts is a Media & UI tool used by 779,278 companies runsonwhat tracks. ### Does Certain use AI tools? Yes. runsonwhat has found Anthropic at Certain; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Certain may use more AI tools than these. ### Which companies have a tech stack similar to Certain's? The companies with the stacks most like Certain's are RightData, VAST Data, Bandwidth and OpenSesame, according to runsonwhat (October 2026). Each shares 13 to 19 tools with Certain, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Certain uses? runsonwhat reads public records only. Of the 35 tools at Certain, 15 were found through code on certain.com, 11 through DNS records, 6 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 certain.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/certain.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.