Home / Groups / Y Combinator companies

Software used by Y Combinator companies

Name: Software used by Y Combinator companies
Creator: Installmap
License: https://creativecommons.org/licenses/by/4.0/

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

Google Analytics 4 runs on 41.0% of the 5,386 Y Combinator domains crawled, 2,206 domains, the most of any business tool in the group.
Google Tag Manager follows at 29.4% (1,581 domains) and Google Ads Conversion at 19.4% (1,043).
The most common infrastructure entry is Cloudflare at 41.0% (2,207 domains).
Webflow leads CMS at 15.7% (845 domains), against 7.4% for WordPress.
HubSpot leads CRM and Marketing Automation at 11.2% (603 domains), against 1.2% for Marketo.
YouTube Embed leads Video at 7.1% (382 domains), against 2.1% for Vimeo.
HubSpot Chat leads Live Chat and Support at 6.3% (338 domains), against 4.2% for Intercom.
By batch year, Google Tag Manager runs from 6.7% in the 2026+ batches to 42.2% in the 2020-21 batches, a spread of 35.5 points.
By industry, Google Tag Manager runs from 13.6% in Industrials to 42.5% in Education, a spread of 28.9 points.
By status, Google Tag Manager runs from 9.7% in Inactive to 39.0% in Acquired, a spread of 29.3 points.

Top tools by share of 5,386 crawled Y Combinator company websites

By category

CRM and Marketing Automation

Tool	Domains	Share
HubSpot	603	11.2%
Marketo	66	1.2%
Mailchimp	48	0.9%
Klaviyo	45	0.8%
Customer.io	18	0.3%

CRM and Marketing Automation across all four groups.

Analytics

Tool	Domains	Share
Google Analytics 4	2,206	41.0%
Google Tag Manager	1,581	29.4%
PostHog	687	12.8%
Cloudflare Web Analytics	504	9.4%
Google Universal Analytics	424	7.9%

Analytics across all four groups.

Live Chat and Support

Tool	Domains	Share
HubSpot Chat	338	6.3%
Intercom	224	4.2%
Crisp	25	0.5%
Zendesk Web Widget	24	0.4%
Drift	11	0.2%

Live Chat and Support across all four groups.

Ecommerce

Tool	Domains	Share
Shopify	67	1.2%
WooCommerce	19	0.4%
Squarespace Commerce	13	0.2%
Recharge	11	0.2%
Adobe Commerce	7	0.1%

Ecommerce across all four groups.

Payments

Tool	Domains	Share
Stripe	86	1.6%
Afterpay	7	0.1%
Klarna	7	0.1%
Paddle	4	0.1%
PayPal	4	0.1%

Payments across all four groups.

Advertising and Attribution

Tool	Domains	Share
Google Ads Conversion	1,043	19.4%
Meta Pixel	912	16.9%
LinkedIn Insight Tag	733	13.6%
Reddit Pixel	267	5.0%
Microsoft Advertising UET	237	4.4%

Advertising and Attribution across all four groups.

Scheduling and Forms

Tool	Domains	Share
HubSpot Forms	152	2.8%
Calendly	94	1.7%
Cal.com	76	1.4%
Gravity Forms	39	0.7%
Typeform	36	0.7%

Scheduling and Forms across all four groups.

Visitor Identification and ABM

Tool	Domains	Share
Apollo.io Tracker	172	3.2%
RB2B	154	2.9%
Vector	123	2.3%
ZoomInfo WebSights	73	1.4%
Warmly	70	1.3%

Visitor Identification and ABM across all four groups.

A/B Testing and Personalization

Tool	Domains	Share
VWO	78	1.4%
Google Optimize	20	0.4%
Optimizely	19	0.4%
Convert Experiences	13	0.2%
Adobe Target	2	0.0%

A/B Testing and Personalization across all four groups.

Tool	Domains	Share
CookieYes	156	2.9%
OneTrust	117	2.2%
Cookiebot	104	1.9%
Termly	47	0.9%
Osano	45	0.8%

Consent and Privacy across all four groups.

Video

Tool	Domains	Share
YouTube Embed	382	7.1%
Vimeo	114	2.1%
Video.js	89	1.7%
Wistia	83	1.5%
Mux	35	0.6%

Video across all four groups.

Search and Reviews

Tool	Domains	Share
G2	132	2.5%
Trustpilot	72	1.3%
Judge.me	16	0.3%
Yotpo	10	0.2%
Algolia	8	0.1%

Search and Reviews across all four groups.

Recruiting and Careers

Tool	Domains	Share
Ashby	110	2.0%
Greenhouse	31	0.6%
Lever	19	0.4%
Workable	12	0.2%
BambooHR	9	0.2%

Recruiting and Careers across all four groups.

CMS

Tool	Domains	Share
Webflow	845	15.7%
WordPress	397	7.4%
Framer	371	6.9%
Sanity	100	1.9%
Squarespace	60	1.1%

CMS across all four groups.

Infrastructure categories

Hosting and CDN

Tool	Domains	Share
Cloudflare	2,207	41.0%
Vercel	1,468	27.3%
jsDelivr	797	14.8%
Amazon CloudFront	400	7.4%
Nginx	295	5.5%

Hosting and CDN across all four groups.

JavaScript Framework

Tool	Domains	Share
React	1,900	35.3%
Next.js	1,767	32.8%
jQuery	1,298	24.1%
Astro	258	4.8%
Vue.js	113	2.1%

JavaScript Framework across all four groups.

UI Framework

Tool	Domains	Share
Google Fonts	2,023	37.6%
Swiper	270	5.0%
Font Awesome	210	3.9%
Bootstrap	201	3.7%
Adobe Fonts	170	3.2%

UI Framework across all four groups.

Developer Tools

Tool	Domains	Share
Google reCAPTCHA	408	7.6%
Cloudflare Turnstile	175	3.2%
Sentry	125	2.3%
hCaptcha	72	1.3%
New Relic Browser	40	0.7%

Developer Tools across all four groups.

By batch year

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

Tool	All	<=2019 (1,595)	2020-21 (984)	2022-23 (1,008)	2024-25 (1,157)	2026+ (642)
Google Analytics 4	41.0%	44.6%	51.6%	49.7%	31.9%	18.2%
Google Tag Manager	29.4%	37.1%	42.2%	33.9%	16.3%	6.7%
Google Ads Conversion	19.4%	21.2%	25.7%	22.2%	14.7%	9.0%
Meta Pixel	16.9%	20.4%	23.8%	18.0%	10.5%	7.8%
Webflow	15.7%	15.4%	25.6%	21.6%	10.2%	1.9%
LinkedIn Insight Tag	13.6%	14.5%	20.1%	17.0%	8.8%	4.8%
PostHog	12.8%	3.4%	10.3%	16.8%	22.1%	16.5%
HubSpot	11.2%	14.2%	18.3%	13.1%	5.1%	0.9%
Cloudflare Web Analytics	9.4%	10.3%	8.2%	8.2%	8.7%	11.5%
Google Universal Analytics	7.9%	16.2%	13.1%	3.5%	0.1%	0.0%
Microsoft Clarity	7.8%	8.8%	12.7%	9.8%	4.0%	1.2%
WordPress	7.4%	15.1%	8.8%	6.1%	0.5%	0.3%
YouTube Embed	7.1%	7.5%	10.4%	7.5%	3.9%	6.1%
Framer	6.9%	1.9%	5.1%	9.6%	13.7%	5.5%
HubSpot Chat	6.3%	9.0%	11.0%	6.9%	1.4%	0.2%

By industry

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

Tool	All	B2B (2,796)	Consumer (670)	Healthcare (620)	Fintech (573)	Industrials (420)	Real Estate and Construction (142)	Education (106)
Google Analytics 4	41.0%	42.3%	37.5%	38.5%	48.3%	25.2%	47.2%	50.0%
Google Tag Manager	29.4%	30.5%	25.5%	26.0%	40.5%	13.6%	34.5%	42.5%
Google Ads Conversion	19.4%	21.4%	18.5%	14.0%	23.2%	7.9%	24.6%	21.7%
Meta Pixel	16.9%	14.8%	27.8%	13.5%	23.0%	4.5%	26.8%	31.1%
Webflow	15.7%	15.6%	6.4%	23.4%	17.6%	16.2%	21.1%	12.3%
LinkedIn Insight Tag	13.6%	17.8%	3.7%	7.6%	14.7%	6.9%	18.3%	16.0%
PostHog	12.8%	16.6%	9.1%	7.1%	9.9%	3.8%	15.5%	13.2%
HubSpot	11.2%	13.4%	3.4%	9.5%	12.6%	7.4%	16.9%	13.2%
Cloudflare Web Analytics	9.4%	10.1%	9.7%	6.5%	9.4%	9.3%	6.3%	9.4%
Google Universal Analytics	7.9%	6.2%	11.3%	7.6%	9.4%	5.0%	16.2%	20.8%
Microsoft Clarity	7.8%	8.3%	7.8%	5.6%	9.9%	1.9%	8.5%	17.9%
WordPress	7.4%	5.4%	7.5%	11.6%	9.2%	9.3%	9.2%	8.5%
YouTube Embed	7.1%	6.7%	6.3%	7.6%	5.9%	7.9%	12.7%	16.0%
Framer	6.9%	8.5%	3.1%	5.2%	8.4%	5.5%	1.4%	4.7%
HubSpot Chat	6.3%	7.4%	2.4%	4.5%	7.3%	2.9%	12.0%	10.4%

By status

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

Tool	All	Active (4,127)	Inactive (650)	Acquired (592)
Google Analytics 4	41.0%	43.6%	24.0%	41.4%
Google Tag Manager	29.4%	31.0%	9.7%	39.0%
Google Ads Conversion	19.4%	21.2%	6.2%	21.1%
Meta Pixel	16.9%	18.1%	9.7%	16.9%
Webflow	15.7%	17.2%	6.6%	15.0%
LinkedIn Insight Tag	13.6%	14.9%	4.8%	14.5%
PostHog	12.8%	15.4%	3.1%	5.4%
HubSpot	11.2%	12.4%	2.2%	12.7%
Cloudflare Web Analytics	9.4%	8.7%	10.9%	12.3%
Google Universal Analytics	7.9%	6.9%	9.5%	13.2%
Microsoft Clarity	7.8%	8.4%	2.8%	8.8%
WordPress	7.4%	5.9%	9.2%	15.5%
YouTube Embed	7.1%	7.9%	2.6%	6.8%
Framer	6.9%	8.2%	1.4%	3.7%
HubSpot Chat	6.3%	7.0%	0.8%	7.6%

Cite

Installmap, software used by Y Combinator companies, 4 September 2026, https://installmap.com/groups/yc.

Copy

Tools counted in this group

Google Analytics 4 41.0%
Google Tag Manager 29.4%
Google Ads Conversion 19.4%
Meta Pixel 16.9%
Webflow 15.7%
LinkedIn Insight Tag 13.6%
PostHog 12.8%
HubSpot 11.2%
Cloudflare Web Analytics 9.4%
Google Universal Analytics 7.9%
Microsoft Clarity 7.8%
WordPress 7.4%
YouTube Embed 7.1%
Framer 6.9%
HubSpot Chat 6.3%
Reddit Pixel 5.0%
Microsoft Advertising UET 4.4%
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 3.0%
CookieYes 2.9%
RB2B 2.9%
HubSpot Forms 2.8%
G2 2.5%
Sentry 2.3%
Vector 2.3%
OneTrust 2.2%
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%
Shopify 1.2%
Marketo 1.2%
Dealfront Leadfeeder 1.2%
Squarespace 1.1%
Mailchimp 0.9%
Termly 0.9%
Klaviyo 0.8%
Osano 0.8%
New Relic Browser 0.7%
Gravity Forms 0.7%
Typeform 0.7%
Mux 0.6%
Greenhouse 0.6%
Crisp 0.5%
Zendesk Web Widget 0.4%
Google Optimize 0.4%
Optimizely 0.4%
WooCommerce 0.4%
Lever 0.4%
Customer.io 0.3%
Judge.me 0.3%
Convert Experiences 0.2%
Squarespace Commerce 0.2%
Workable 0.2%
Recharge 0.2%
Drift 0.2%
Yotpo 0.2%
BambooHR 0.2%
Algolia 0.1%
Adobe Commerce 0.1%
Afterpay 0.1%
Klarna 0.1%