# What does Calcs.com use? Calcs.com (calcs.com) shows public evidence of 25 tools, according to runsonwhat (last checked 2026-10-21). - Industry: Software - Size: 11–50 employees - Based in: Melbourne, Australia - Founded: 2016 - LinkedIn: https://www.linkedin.com/company/getcalcs ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [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 | Custom domain, 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 | | | [OpenAI](https://www.runsonwhat.com/reverse/openai) | AI | DNS verification records | | ## Data & Observability | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code | | | [Segment](https://www.runsonwhat.com/reverse/segment) | Analytics | Website code | | | [Mixpanel](https://www.runsonwhat.com/reverse/mixpanel) | Analytics | Website code | | | [Rootly](https://www.runsonwhat.com/reverse/rootly) | Monitoring | Custom domain | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Ads](https://www.runsonwhat.com/reverse/google-ads) | Ads & Pixels | Website code | | | [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Email records, Website code | | | [Webflow](https://www.runsonwhat.com/reverse/webflow) | Website & CMS | Custom domain | | | [Ahrefs](https://www.runsonwhat.com/reverse/ahrefs) | Marketing | Website code | | ## 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 | | | [Mailchimp Transactional](https://www.runsonwhat.com/reverse/mandrill) | Email Delivery | DNS verification records, Email records | | | [Let's Encrypt](https://www.runsonwhat.com/reverse/letsencrypt) | Security & Compliance | DNS records | | | [Google Trust Services](https://www.runsonwhat.com/reverse/google-trust) | Security & Compliance | DNS records | | | [Amazon Trust Services](https://www.runsonwhat.com/reverse/amazon-trust) | Security & Compliance | DNS records | | | [Figma](https://www.runsonwhat.com/reverse/figma) | Collaboration | DNS verification records | | | [HubSpot App Developer](https://www.runsonwhat.com/reverse/hubspot-developer) | Dev Tools | DNS verification records | | | [Zapier](https://www.runsonwhat.com/reverse/zapier) | Dev Tools | DNS verification records | | ## FAQ ### What tools does Calcs.com use? As of October 2026, runsonwhat has found 25 tools at Calcs.com (calcs.com) in public records. Edge & Hosting: Amazon Web Services, Amazon Route 53 and Amazon CloudFront. Application: React, Tailwind CSS and Next.js. Data & Observability: Google Analytics, Segment and Mixpanel. Go-to-market: Google Ads, HubSpot and Webflow. Company Ops: Microsoft 365, Google Workspace and Mailchimp Transactional. Last checked October 21, 2026. ### What cloud does Calcs.com run on? Calcs.com uses Amazon Web Services for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on calcs.com. Amazon Web Services is used by 145,885 companies runsonwhat tracks. ### What CRM does Calcs.com use? Calcs.com uses HubSpot for its CRM, according to runsonwhat (October 2026). runsonwhat found HubSpot through email records that authorize HubSpot and code on calcs.com. HubSpot is used by 94,490 companies runsonwhat tracks. ### What email provider does Calcs.com use? Calcs.com uses Microsoft 365 for email and office software, alongside Google Workspace, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 713,664 companies runsonwhat tracks. ### What analytics tools does Calcs.com use? Calcs.com uses Google Analytics for analytics, alongside Segment and Mixpanel, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on calcs.com. Google Analytics is used by 886,054 companies runsonwhat tracks. ### What is Calcs.com's website built with? Calcs.com uses Webflow for its website, according to runsonwhat (October 2026). runsonwhat found Webflow through a subdomain that points at Webflow. Webflow is used by 35,060 companies runsonwhat tracks. ### Does Calcs.com use Google Ads? Yes. runsonwhat found Google Ads at Calcs.com through Google Ads code on calcs.com. Google Ads is a Ads & Pixels tool used by 511,264 companies runsonwhat tracks. ### Does Calcs.com use AI tools? Yes. runsonwhat has found OpenAI at Calcs.com; OpenAI, for example, through a DNS verification record for OpenAI. AI services called only from servers leave no public trace, so Calcs.com may use more AI tools than these. ### Which companies have a tech stack similar to Calcs.com's? The companies with the stacks most like Calcs.com's are Payabli, Kard, Timescale, Inc., dba Tiger Data and UP42, according to runsonwhat (October 2026). Each shares 11 to 16 tools with Calcs.com, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Calcs.com uses? runsonwhat reads public records only. Of the 25 tools at Calcs.com, 11 were found through DNS records, 9 through code on calcs.com, 3 through subdomains that point at the vendor and 2 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and calcs.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/calcs.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.