What does Andreessen Horowitz use?

As of October 2026, runsonwhat has found 56 tools at Andreessen Horowitz (a16z.com) in public records. Edge & Hosting: Cloudflare, Amazon CloudFront and Netlify. Application: GSAP, Adobe Fonts and Anthropic. Data & Observability: Google Analytics, Google Tag Manager and Crazy Egg. Go-to-market: WordPress, Google Ads and Meta Pixel. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked October 7, 2026.

Andreessen Horowitz uses Netlify for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Netlify through Netlify code on a16z.com. Netlify is used by 10,930 companies runsonwhat tracks.

Andreessen Horowitz uses HubSpot for its CRM, alongside Salesforce and Affinity, according to runsonwhat (October 2026). runsonwhat found HubSpot through a DNS verification record for HubSpot and code on a16z.com. HubSpot is used by 91,893 companies runsonwhat tracks.

Andreessen Horowitz 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 700,596 companies runsonwhat tracks.

Andreessen Horowitz uses HappyFox for customer support and documentation, according to runsonwhat (October 2026). runsonwhat found HappyFox through email records that authorize HappyFox. HappyFox is used by 849 companies runsonwhat tracks.

Andreessen Horowitz uses Stripe for payments and billing, according to runsonwhat (October 2026). runsonwhat found Stripe through a DNS verification record for Stripe and code on a16z.com. Stripe is used by 26,168 companies runsonwhat tracks.

Andreessen Horowitz has used Marketo since at least June 2019, going by the first public certificate of the a16z.com subdomain that points at Marketo.

Yes. runsonwhat found Cloudflare at Andreessen Horowitz through Cloudflare code on a16z.com. Cloudflare is a CDN & Edge tool used by 691,534 companies runsonwhat tracks.

Yes. runsonwhat has found Anthropic, OpenAI, Perplexity and ElevenLabs at Andreessen Horowitz; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Andreessen Horowitz may use more AI tools than these.

Yes. As of October 2026, Andreessen Horowitz has 14 open roles on its public Ashby job board, most in marketing (3), operations (2) and data & AI (1). None were posted in the last 30 days.

The companies with the stacks most like Andreessen Horowitz's are Meta Platforms, Accel, The New York Times and MasterClass, according to runsonwhat (October 2026). Each shares 14 to 26 tools with Andreessen Horowitz, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

runsonwhat reads public records only. Of the 56 tools at Andreessen Horowitz, 31 were found through DNS records, 19 through code on a16z.com, 5 through email records and 1 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and a16z.com about monthly.