Top Y Combinator Companies Tech Stack in 2025

Updated April 22, 2025•Written By Christoffer

In this comprehensive article, you will discover what tech stack startups often use in 2025.

Start your online store with Shopify. Easily create a professional online store — no coding required.

Startups are known for using trendy and modern tech stacks.

Their landing pages are often filled with cool animations and state-of-the-art design elements.

In this list, we have compiled the latest 500 companies from Y Combinator, along with their respective tech stacks.

All websites in this list were checked using the Stackcrawler tool to determine the technology stack they were using.

Y Combinator Companies Tech Stack Statistics

Based on the 500 latest Y Combinator companies, we found that:

React is the most popular tool, used by 250 websites (50% of all analyzed pages).
Next.js is the second most used framework, appearing in 174 sites (34.8%).
Framer is prominent, especially for interactive designs, appearing on 130 websites (26%).
129 companies use Wix.
Vercel dominate as hosting solutions, used by 128 (25.6%) sites.

Sources: Stackcrawler.com, Y Combinator Startup Directory

There is no doubt that React and Next.js are popular choices for startups.

While Framer requires no coding experience, Next.js is a JavaScript framework that requires some setup and coding knowledge.

Interestingly, only a few startups use WordPress, the most used CMS globally, and have been for decades. This shows that startups often use more trendy tools and website builders than other sectors.

Top 5 Most Popular Technologies

React is by far the most widely used technology among startups in the Y Combinator list. 250 of the 500 startup websites use React.

React – 250 sites (50%)
Next.js – 174 sites (34.8%)
Framer – 130 sites (26%)
Wix– 129 sites (25.8%)
jQuery – 97 sites (19.4%)

If all the technologies used above are summed, you will notice that the total exceeds 100%, which might seem somewhat unusual. But there’s a reason for it.

React, for example, is the primary library in Next.js; therefore, all Next.js apps will also include React as part of their technology stack.

The same applies to jQuery, which is often used in conjunction with, for example, Webflow.

After further investigation, it was discovered that jQuery is a component of Webflow websites, and therefore naturally appears on these websites, along with other technologies.

Sources: Stackcrawler.com, Y Combinator Startup Directory

Top Hosting Services

Vercel – 128 sites (25.6%)
Framer Hosting – 121 sites (24.2%)
Webflow – 37 sites (7.4%)
Nginx – 15 sites (3%)
Netlify – 10 sites (2%)
GitHub Pages – 7 sites (1.4%)
Squarespace Hosting – 5 sites (1%)
Apache – 1 site (0.2%)

Please note that the above statistics may not be comprehensive, as not all hosting services can be detected, resulting in some data on the hosting provider being omitted.

Sources: Stackcrawler.com, Y Combinator Startup Directory

Top Domain Extensions

.com dominates, used by 226 sites (45.2%), which highlights its continued popularity and trustworthiness.
.ai is significantly popular, appearing on 150 sites (30%), showcasing a strong inclination towards artificial intelligence-focused startups.
.io maintains notable popularity, used by 22 sites (4.4%), showing its continued appeal among tech startups.

Sources: Stackcrawler.com, Y Combinator Startup Directory

Top Y Combinator Companies Tech Stack in 2025

In This Article

Y Combinator Companies Tech Stack Statistics

Top 5 Most Popular Technologies

Top Hosting Services

Top Domain Extensions

Hand-picked examples of Y Combinator landing pages

parley.so

cloudcruise.com

newmoneycompany.com

modernrealty.io

ryvn.ai

gauge.sh

joinergo.com

villagelabs.app

gopromptless.ai

onlook.com

withaqua.com

autopallet.bot

thundercompute.com

partcl.com

rescript.ai

tallyhq.com

midship.ai

beebettor.com

kenley.ai

affil.ai

codebuff.com

sublingual.ai

github.com

opslane.com

assistant-ui.com

sphinxlabs.ai

tryfuse.ai

steinmetzmotors.com

ideate.xyz

trynextbyte.com

getsymphony.co

corgi.insure

kopra.bio

lysto.ai

getbluebook.com

casixty.com

ionworks.com

info.mathgptpro.com

centauri-ai.tech

godiligent.ai

mundoai.world

synthiolabs.com

felafax.ai

surge.app

offdeal.io

firaresearch.com

ledgerup.ai

useautumn.com

getauthed.dev

miyagilabs.ai

parsewise.ai

superglue.cloud

phonely.ai

himodus.com

simcare.ai

prismreplay.com

humanlayer.dev

fresco-ai.com

claimsorted.com

fromolive.com

harbera.com

trykura.com

mathdash.com

firstwork.com

opencall.ai

tergle.com

societies.io

trykeet.com

voideditor.com

andoria.ai

getapproval.ai

wordware.ai

cardamon.ai