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Software used by Y Combinator companies

5,386 of 6,133 companies crawled on 4 September 2026.

5,386 of 6,133 Y Combinator domains returned a usable record and form the denominator. 5,242 were counted from a rendered homepage crawl on 4 September 2026, 144 from a plain fetch only, and 747 returned no usable record. Company list: Y Combinator company directory.

Summary

• HubSpot runs on 11.2% of the 5,386 Y Combinator domains crawled (602 domains), ahead of Marketo at 1.2%.
• Google Ads Conversion runs on 19.4% of the 5,386 Y Combinator domains crawled (1,046 domains), ahead of Meta Pixel at 17.0%.
• CookieYes runs on 2.9% of the 5,386 Y Combinator domains crawled (156 domains), ahead of OneTrust at 2.2%.
• Intercom runs on 4.2% of the 5,386 Y Combinator domains crawled (225 domains), ahead of HubSpot Chat at 2.2%.
• Apollo.io Tracker runs on 3.2% of the 5,386 Y Combinator domains crawled (172 domains), ahead of RB2B at 2.9%.
• PostHog runs on 12.8% of the 5,386 Y Combinator domains crawled (688 domains), ahead of Cloudflare Web Analytics at 9.5%.
• Webflow runs on 15.7% of the 5,386 Y Combinator domains crawled (845 domains), ahead of Framer at 6.9%.
• HubSpot Forms runs on 2.8% of the 5,386 Y Combinator domains crawled (152 domains), ahead of Calendly at 1.7%.
• OneTrust runs on 2.2% of Y Combinator companies and 44.9% of the Fortune 500.
• Adobe Experience Manager runs on 0.3% of Y Combinator companies and 27.5% of the Fortune 500.
• By batch year, Webflow runs from 1.9% in the 2026+ batches to 25.6% in the 2020-21 batches, a spread of 23.7 points.
• By industry, Meta Pixel runs from 4.5% in Industrials to 31.1% in Education, a spread of 26.6 points.
• By status, Google Ads Conversion runs from 6.2% in Inactive to 21.3% in Acquired, a spread of 15.1 points.

By category

By batch year

Share of each segment's own crawled domains. Segments under 100 crawled domains are left out.

By industry

Share of each segment's own crawled domains. Segments under 100 crawled domains are left out.

By status

Share of each segment's own crawled domains. Segments under 100 crawled domains are left out.

Tools counted in this group

• Google Analytics 4 41.0%
• Google Tag Manager 29.4%
• Google Ads Conversion 19.4%
• Meta Pixel 17.0%
• Webflow 15.7%
• LinkedIn Insight Tag 13.7%
• PostHog 12.8%
• HubSpot 11.2%
• Cloudflare Web Analytics 9.5%
• Google Universal Analytics 7.9%
• Microsoft Clarity 7.8%
• WordPress 7.4%
• YouTube Embed 7.1%
• Framer 6.9%
• Reddit Pixel 5.0%
• Microsoft Advertising UET 4.5%
• Intercom 4.2%
• Google Campaign Manager 3.9%
• Hotjar 3.8%
• X Ads Pixel 3.8%
• Segment 3.8%
• Apollo.io Tracker 3.2%
• TikTok Pixel 3.1%
• CookieYes 2.9%
• RB2B 2.9%
• HubSpot Forms 2.8%
• G2 2.5%
• Sentry 2.3%
• Vector 2.3%
• HubSpot Chat 2.2%
• OneTrust 2.2%
• Ahrefs Web Analytics 2.1%
• Vimeo 2.1%
• Ashby 2.0%
• Cookiebot 1.9%
• Mixpanel 1.9%
• Sanity 1.9%
• Calendly 1.7%
• Video.js 1.7%
• Stripe 1.6%
• Wistia 1.5%
• Tealium iQ 1.5%
• VWO 1.4%
• Cal.com 1.4%
• ZoomInfo WebSights 1.4%
• Trustpilot 1.3%
• Warmly 1.3%
• Marketo 1.2%
• Shopify 1.2%
• Unify 1.2%
• Webflow Optimize (Intellimize) 1.2%
• Dealfront Leadfeeder 1.2%
• Squarespace 1.1%
• Snitcher 1.1%
• Leadsy 1.0%
• Amplitude 1.0%
• Mailchimp 0.9%
• FullStory 0.9%
• Termly 0.9%
• Osano 0.8%
• Contentful 0.8%
• Klaviyo 0.8%
• Embedly 0.8%
• HubSpot CMS 0.8%
• Rewardful 0.8%
• Wix 0.8%
• Qualified 0.8%
• Plausible 0.7%
• New Relic Browser 0.7%
• Gravity Forms 0.7%
• Typeform 0.7%
• ClickCease 0.6%
• Mux 0.6%
• Heap 0.6%
• Consent Pro 0.6%
• AdRoll 0.6%
• Quora Pixel 0.6%
• 6sense 0.6%
• Dub 0.6%
• Greenhouse 0.6%
• Iubenda 0.6%
• Pinterest Tag 0.6%
• Atlassian Statuspage 0.6%
• Common Room 0.6%
• StackAdapt 0.5%
• Default 0.5%
• Contentsquare 0.5%
• Marketo Forms 0.5%
• Factors.ai 0.5%
• Google Forms 0.5%
• Crisp 0.5%
• Snap Pixel 0.5%
• Zendesk Web Widget 0.4%
• Reo.dev 0.4%
• Tally 0.4%
• Datadog RUM 0.4%
• accessiBe 0.4%
• consentmanager 0.4%
• Prismic 0.4%
• Google Optimize 0.4%
• Weglot 0.4%
• Optimizely 0.4%
• WooCommerce 0.4%
• Oneleet 0.4%
• Lever 0.4%
• Adobe Experience Platform Tags 0.4%
• Navattic 0.3%
• Matomo 0.3%
• Customer.io 0.3%
• FirstPromoter 0.3%
• Crazy Egg 0.3%
• Cloudflare Stream 0.3%
• Koala 0.3%
• Clearbit Reveal 0.3%
• Impact 0.3%
• Taboola 0.3%
• Fathom Analytics 0.3%
• Cookie-Script 0.3%
• Judge.me 0.3%
• Adobe Marketo Measure 0.3%
• Loom 0.3%
• Dreamdata 0.3%
• lemlist 0.3%
• Transcend 0.3%
• ShareThis 0.3%
• ProfitWell 0.3%
• Adobe Experience Manager 0.3%
• Elfsight 0.3%
• Storyblok 0.3%
• ActiveCampaign 0.3%
• RudderStack 0.3%
• HubSpot Meetings 0.3%
• OptinMonster 0.3%
• TrustArc 0.2%
• Salesforce Pardot 0.2%
• Convert Experiences 0.2%
• Optibase 0.2%
• Squarespace Commerce 0.2%
• Triple Whale 0.2%
• Workable 0.2%
• Zoho SalesIQ 0.2%
• Usercentrics 0.2%
• Ketch 0.2%
• Drift 0.2%
• Recharge 0.2%
• Primer 0.2%
• Chatwoot 0.2%
• Swan 0.2%
• Atlas 0.2%
• DataGrail 0.2%
• Mida 0.2%
• Tolt 0.2%
• Yotpo 0.2%
• Tawk.to 0.2%
• Lovable 0.2%
• Gorgias 0.2%
• Arcade 0.2%
• Complianz 0.2%
• LiveChat 0.2%
• Delve 0.2%
• BambooHR 0.2%
• Promptwatch 0.2%
• Help Scout Beacon 0.2%
• Leadpipe 0.2%
• Storylane 0.2%
• TrueVault Polaris 0.2%
• Mutiny 0.2%
• AthenaHQ 0.1%
• Smartlook 0.1%
• Algolia 0.1%
• Axeptio 0.1%
• Pingdom RUM 0.1%
• CookieHub 0.1%
• Octolane 0.1%
• Pylon 0.1%
• Enzuzo 0.1%
• UserWay 0.1%
• Chili Piper 0.1%
• Intelligems 0.1%
• Quantcast Measure 0.1%
• Outbrain 0.1%
• Salesforce Web-to-Lead 0.1%
• Awin 0.1%
• Visual Visitor 0.1%
• Lucky Orange 0.1%
• Vidyard 0.1%
• Klevu 0.1%
• Adobe Commerce 0.1%
• Yandex Metrica 0.1%
• Drupal 0.1%
• Klarna 0.1%
• Afterpay 0.1%
• Umami 0.1%
• GitBook 0.1%
• Metricool 0.1%
• Bugsnag 0.1%
• Mouseflow 0.1%
• Albacross 0.1%
• Jotform 0.1%
• Olark 0.1%
• Demandbase 0.1%
• Criteo 0.1%
• Zoho CRM Forms 0.1%
• Brevo 0.1%
• LogRocket 0.1%
• Influ2 0.1%
• PromoteKit 0.1%
• Ghost 0.1%
• Clicky 0.1%
• CallRail 0.1%
• AddToAny 0.1%
• OneSignal 0.1%
• OptiMonk 0.1%
• PartnerStack 0.1%
• Akamai mPulse 0.1%
• Metadata.io 0.1%