# What does Which? use? Which? (which.co.uk) shows public evidence of 31 tools, according to runsonwhat (last checked 2026-11-15). - Based in: United Kingdom ## 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 | Website code | | | [IBM Cloud](https://www.runsonwhat.com/reverse/ibm-cloud) | Hosting & Cloud | DNS verification records | | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [Stripe](https://www.runsonwhat.com/reverse/stripe) | Payments & Billing | DNS verification records, Website code | | | [Motion](https://www.runsonwhat.com/reverse/framer-motion) | Media & UI | 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 | | | [Segment](https://www.runsonwhat.com/reverse/segment) | Analytics | DNS verification records, Website code | | | [AppsFlyer](https://www.runsonwhat.com/reverse/appsflyer) | Analytics | Custom domain | | | [GrowthBook](https://www.runsonwhat.com/reverse/growthbook) | Flags & Experiments | Website code | | ## 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 | DNS verification records, Website code | | | [Salesforce](https://www.runsonwhat.com/reverse/salesforce) | Sales & CRM | Email records, Website code | | | [Google AdSense](https://www.runsonwhat.com/reverse/google-adsense) | Ads & Pixels | Website code | | | [Yandex Webmaster](https://www.runsonwhat.com/reverse/yandex) | Marketing | DNS verification records | | | [Apollo.io](https://www.runsonwhat.com/reverse/apollo) | Sales & CRM | Website code | | | [Salesforce Marketing Cloud](https://www.runsonwhat.com/reverse/sfmc) | Marketing | Custom domain, Email records | | ## 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 | | | [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records | | | [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records | | | [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records | | | [Amazon SES](https://www.runsonwhat.com/reverse/ses) | Email Delivery | Email records, Website code | | | [OneTrust](https://www.runsonwhat.com/reverse/onetrust) | Security & Compliance | DNS verification records, Website code | | | [Mimecast](https://www.runsonwhat.com/reverse/mimecast) | Security & Compliance | Email records | | | [Miro](https://www.runsonwhat.com/reverse/miro) | Collaboration | DNS verification records | | | [1Password](https://www.runsonwhat.com/reverse/1password) | Security & Compliance | DNS verification records | | | [ProdPad](https://www.runsonwhat.com/reverse/prodpad) | Collaboration | DNS verification records | | ## Recent changes at Which? - 2026-11-08: started using again [1Password](https://www.runsonwhat.com/reverse/1password) - 2026-11-08: started using again [Apple Business](https://www.runsonwhat.com/reverse/apple) - 2026-11-08: started using again [Atlassian](https://www.runsonwhat.com/reverse/atlassian) - 2026-11-08: started using again [Google Search Console](https://www.runsonwhat.com/reverse/gsc) - 2026-11-08: started using again [IBM Cloud](https://www.runsonwhat.com/reverse/ibm-cloud) - 2026-11-08: started using again [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) - 2026-11-08: started using again [Miro](https://www.runsonwhat.com/reverse/miro) - 2026-11-08: started using again [ProdPad](https://www.runsonwhat.com/reverse/prodpad) - 2026-11-08: started using again [Salesforce Marketing Cloud](https://www.runsonwhat.com/reverse/sfmc) - 2026-11-08: started using again [Yandex Webmaster](https://www.runsonwhat.com/reverse/yandex) - 2026-10-31: stopped using [ProdPad](https://www.runsonwhat.com/reverse/prodpad) - 2026-10-31: stopped using [1Password](https://www.runsonwhat.com/reverse/1password) ## FAQ ### What tools does Which? use? As of November 2026, runsonwhat has found 31 tools at Which? (which.co.uk) in public records. Edge & Hosting: Amazon Web Services, Amazon Route 53 and Amazon CloudFront. Application: Stripe and Motion. Data & Observability: Google Analytics, Google Tag Manager and web-vitals. Go-to-market: Google Ads, Meta Pixel and Salesforce. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked November 15, 2026. ### What cloud does Which? run on? Which? uses Amazon Web Services for hosting and cloud infrastructure, alongside IBM Cloud, according to runsonwhat (November 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on which.co.uk. Amazon Web Services is used by 147,744 companies runsonwhat tracks. ### What CRM does Which? use? Which? uses Salesforce for its CRM, alongside Apollo.io, according to runsonwhat (November 2026). runsonwhat found Salesforce through email records that authorize Salesforce and code on which.co.uk. Salesforce is used by 35,664 companies runsonwhat tracks. ### What email provider does Which? use? Which? uses Microsoft 365 for email and office software, alongside Google Workspace and Apple Business, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 739,101 companies runsonwhat tracks. ### What payment provider does Which? use? Which? uses Stripe for payments and billing, according to runsonwhat (November 2026). runsonwhat found Stripe through a DNS verification record for Stripe and code on which.co.uk. Stripe is used by 31,550 companies runsonwhat tracks. ### What analytics tools does Which? use? Which? uses Google Analytics for analytics, alongside Google Tag Manager, Segment and AppsFlyer, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on which.co.uk. Google Analytics is used by 904,755 companies runsonwhat tracks. ### Does Which? use Google Ads? Yes. runsonwhat found Google Ads at Which? through Google Ads code on which.co.uk. Google Ads is a Ads & Pixels tool used by 541,195 companies runsonwhat tracks. ### Has Which? changed tools recently? Yes. On runsonwhat's rechecks, Which? started using 1Password, Apple Business and Atlassian (latest on November 8, 2026) and stopped using ProdPad, 1Password and Microsoft 365 (latest on October 31, 2026). A change counts only between two checks of which.co.uk done the same way. ### Which companies have a tech stack similar to Which?'s? The companies with the stacks most like Which?'s are Kandji, Aptem, Altium and Epiq, according to runsonwhat (November 2026). Each shares 9 to 18 tools with Which?, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Which? uses? runsonwhat reads public records only. Of the 31 tools at Which?, 14 were found through DNS records, 10 through code on which.co.uk, 5 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 which.co.uk about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/which.co.uk (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.