Investor portfolio — Y Combinator

Companies funded by Y Combinator

152 portfolio companies backed by Y Combinator, with most activity in AI, Dev Tools, SaaS and based in Remote, San Francisco, Paris.

RS
Resend
Email API for developers — built on React.
Dev Tools·Series A
AS
Ashby
All-in-one recruiting platform built for elite teams.
SaaS·Series C
PH
PostHog
The single platform to analyze, test, observe, and deploy.
Open Source·Series C
NU
Nourish
Insurance-covered nutritional counseling.
Other·Series B
IF
Infisical
The open-source secret manager.
Open Source·Seed
TR
Trigger.dev
The open-source background jobs framework.
Open Source·Seed
AR
Arcade
Interactive product demos in minutes.
SaaS·Series A
MI
Mintlify
Documentation that converts.
SaaS·Series A
RM
ReadMe
Beautiful, personalized developer hubs.
SaaS·Series C
LF
Langfuse
Open-source LLM engineering platform.
Open Source·Seed
BL
Brilliant Labs
Open-source AI glasses.
Other·Seed
AS
AssemblyAI
Speech AI models for production scale.
AI·Series C
DG
Deepgram
Voice AI platform built for speed and accuracy.
AI·Series B
PM
Permit.io
Authorization as a service.
Dev Tools·Seed
HT
Hightouch
The leading Composable CDP & reverse ETL platform.
SaaS·Series B
UK
Unkey
Open-source API authentication and authorization.
Open Source·Seed
NC
NocoDB
The open-source Airtable alternative.
Open Source·Series A
PS
PadSplit
Affordable housing through shared homes.
Marketplace·Series B
VC
Vouch
Insurance built for startups.
Fintech·Series C
E2
E2B
Sandboxes for AI agents.
AI·Seed
LU
Lutra
AI for everyday data work.
AI·Seed
TV
Tavus
AI-generated personalized video.
AI·Series A
AT
Attention
AI sales coach + assistant for sales reps.
AI·Seed
PR
PhotoRoom
AI image editing for commerce.
AI
LP
Loops
Email for modern SaaS companies
SaaS·Seed
DB
Dub.co
Open-source link management for modern teams
SaaS·Seed
CW
Chatwoot
Open-source customer support platform
SaaS·Seed
KR
Krea
Real-time AI generation for creative professionals
AI
RM
Rainmaker
Making droughts end
SaaS·Series A
HC
Helicone
Open source LLM observability for production AI
Dev Tools·Seed
EX
Exa AI
Neural search API designed for AI applications
AI·Seed
FC
Firecrawl
Web scraping API built for LLMs
Dev Tools·Seed
E2
E2B
Secure code execution sandboxes for AI agents
Dev Tools·Seed
HL
Highlight
Open source full-stack monitoring and error tracking
Dev Tools·Seed
IN
Instant
Realtime database for modern applications
Dev Tools·Seed
NG
Nango
Open source platform for product integrations
Dev Tools·Seed
EV
Evidence
Open source business intelligence with Markdown and SQL
Dev Tools·Seed
LG
Lago
Open source billing and metering for usage-based pricing
Fintech·Series A
JM
Jam
One-click bug reports that developers actually love
Dev Tools·Seed
AP
Activepieces
Open source business automation platform
SaaS·Seed
MM
Marimo
Reactive Python notebooks you can deploy as apps
Dev Tools·Seed
TR
Trim
A foundation model for physics.
AI·YC W25
MF
Maritime Fusion
Fusion reactors for ships
SaaS·YC W25
BY
Bystreet
Your key to the hotel market.
SaaS·YC W25
PH
Paratus Health
Medical Voice Agents for Patient Management
AI·YC W25
RO
Roark
Test, monitor, and improve your voice agents
AI·YC W25
SP
Spott
AI-native ATS/CRM for recruiting firms
SaaS·YC W25
RS
Reditus Space
Reusable Satellites for zero-g manufacturing
SaaS·YC W25
MI
Misprint
Robinhood for Pokemon cards
Marketplace·YC W25
ML
Miyagi Labs
AI tutors for exam prep
AI·YC W25
OU
Outlit
Customer Context for Agents
AI·YC W25
NI
Nitrode
Data for reasoning agents in dynamic environments
AI·YC W25
PR
Promptless
An AI teammate that automatically updates customer docs
Dev Tools·YC W25
BU
Bud
Agent with a computer
AI·YC W25
OU
Outship
Hire amazing engineers by seeing how they use AI
SaaS·YC W25
ME
Mentra
Building the open source smart glasses operating system.
Dev Tools·YC W25
AR
Artifact
A Collaborative, AI-native IDE for Hardware Engineers
Dev Tools·YC W25
BU
Browser Use
Leading open-source web agent project with 50k stars in 3 months
Dev Tools·YC W25
ER
Ergo
AI agents and unified data layer for revenue teams
AI·YC W25
CO
CopyCat
AI agents built for insurance.
Fintech·YC W25
WO
Woz
Claude Code plugin that reduces token consumption and cost by 50%
Dev Tools·YC W25
LA
Lopus AI
Analytics built for Growth
SaaS·YC W25
10
10x
AI Sales Teams for Dental Practices
AI·YC W25
TA
Toothy AI
AI for insurance verification and billing at dental clinics
Fintech·YC W25
CO
Conntour
AI to monitor thousands of security cameras.
AI·YC W25
VH
Vocality Health
Voice AI for medical language translation
AI·YC W25
AL
Alice.tech
AI-driven exam prep
AI·YC W25
FA
Fazeshift
AI agent for Accounts Receivable
Fintech·YC S24
CE
Central
Payroll, benefits, state compliance for startups
Fintech·YC S24
OU
Outerport
AI engineering scientists - search PLMs, read drawings, run simulations.
AI·YC S24
MA
Mica AI
Replace the humans fixing bad data
AI·YC S24
CA
Capitol AI
Sovereign operating system for intelligence
SaaS·YC S24
TE
Terra
Design and sell products in minutes
Marketplace·YC S24
RE
RentFlow
First Buy Now Pay Later solution for Commercial Rent
Fintech·YC S24
RA
Rastro
The fastest way to launch product catalogs
AI·YC S24
DA
Dataleap
The world's first vibe working platform
SaaS·YC S24
HA
Haystack
AI review layer that decides which code changes need attention
Dev Tools·YC S24
WI
Winfunc
AI-native security engineering for mission critical codebases
Dev Tools·YC S24
FA
FINNY AI
The organic growth engine for financial advisors
Fintech·YC S24
LA
Lighthouz AI
Freight bill audits and AP/AR automation for brokers
AI·YC S24
PR
Proxis
The platform for enterprise AI agent automations
AI·YC S24
RE
RetroFix
Automate any workflow using plain english
AI·YC S24
CI
Corgi Insurance
Building an AI financial infrastructure company
Fintech·YC S24
MD
mdhub
AI-native operating system for behavioral health
AI·YC S24
CH
Cheers
Win local search on ChatGPT and other LLMs
SaaS·YC S24
MI
Midship
AI for SOX testing
Fintech·YC S24
SI
SimCare
AI avatars to scale healthcare training
AI·YC S24
AA
Arva AI
AI Agents to scale AML, KYB and KYC operations
Fintech·YC S24
AF
Affil.ai
AI Affiliate Network For Financial Companies
Fintech·YC S24
OW
Oway
AI Infrastructure for America's Empty Truck Space
AI·YC S24
OL
Orca Launcher
A launcher that turns Minecraft into a game platform
Marketplace·YC S24
TF
The Forecasting Company
Foundation models for time series
AI·YC S24
ZA
Zeit AI
From data to enterprise insights in just a few words
AI·YC S24
DI
Distro
AI co-pilot for sales reps at industrial wholesale distributors
AI·YC S24
BI
Biocartesian
Converting biology into digital molecular maps
SaaS·YC S24
AN
Anthrogen
Training the next generation of protein foundation models
AI·YC S24
AR
Azalea Robotics
Automating airport baggage handling with robots
SaaS·YC S24
CH
Codes Health
Medical Record Retrieval with Zero Human Error
SaaS·YC S24
EN
Entangl
Find and resolve issues in data center engineering using AI
AI·YC S24
HE
HeartByte
GenAI Interactive story. Creator write fictions 10x faster.
AI·YC W24
HA
Hazel
AI-enabled procurement for government
AI·YC W24
EL
Ellipsis
AI code reviews and bug fixes
Dev Tools·YC W24
IN
InQuery
Intelligent Medical Record Reviews
AI·YC W24
ZA
Zaymo
Interactive email builder for ecommerce brands
SaaS·YC W24
EN
Encore
Developer-first backend framework with built-in infra
Dev Tools·Seed
HP
Hoppscotch
Open source API development ecosystem
Dev Tools·Seed
AG
Agno
Open source framework for multi-modal AI agents
AI·Seed
BM
Beam
Serverless infrastructure for AI and ML workloads
AI·Seed
TW
Twenty
Open source CRM built for modern teams
SaaS·Seed
RQ
Requestly
Browser extension and proxy for API mocking and testing
Dev Tools·Seed
TL
Traceloop
Open-source LLM observability with OpenTelemetry
AI·Seed
PK
Portkey
AI gateway and LLMOps platform for production
AI·Series A
VA
Vapi
Voice AI infrastructure for developers
AI·Seed
RA
Retell AI
Build, test, and deploy voice AI agents
AI·Seed
AS
AssemblyAI
Audio intelligence API for developers
AI·Series C
CF
Coframe
AI that continuously optimises your website copy
AI·Seed
GL
Glif
Build and share AI-powered mini apps
AI·Seed
IC
Infracost
Cloud cost estimates in pull requests
Dev Tools·Series A
EA
Earthly
Containerised CI/CD builds that run anywhere
Dev Tools·Series A
BN
Bun
Incredibly fast JavaScript runtime and toolkit
Dev Tools·Series A
WG
WunderGraph
API integration platform and GraphQL federation
Dev Tools·Seed
SL
Slope
B2B buy-now-pay-later payments
Fintech·Series A
ES
Escape
API security testing and DAST for developers
Dev Tools·Series A
PT
Patch
Carbon removal and climate project infrastructure
SaaS·Series A
OP
Opus Clip
AI video repurposing for short-form content
AI·Series A
GR
Greptile
AI that reads your entire codebase to catch bugs
AI·Seed
MT
Mastra
The TypeScript framework for building AI agents
Dev Tools·Seed
BK
Blacksmith
2x faster GitHub Actions with zero config changes
Dev Tools·Series A
BM
Bemi
Automatic audit trails for PostgreSQL without code changes
Dev Tools·Seed
GG
Gigs
Launch a mobile service that runs itself
SaaS·Series B
CC
Casca
AI loan origination that lets banks process 10x more
SaaS·Series A
UP
Upflow
The modern accounts receivable platform for B2B
Fintech·Series B
SL
Slash
Business banking built for internet entrepreneurs
Fintech·Series A
RM
Roam
Buy a home by taking over a 2-3% mortgage from a seller
Fintech·Series A
SF
Synthflow AI
No-code AI phone call agents for any business
AI·Seed
RZ
Row Zero
The fastest spreadsheet in the browser
SaaS·Seed
NM
Numeral
Automated sales tax compliance for modern commerce
Fintech·Seed
SR
SurrealDB
The ultimate multi-model database
Open Source·Series A
ST
SuperTokens
Open source authentication that is 10x easier
Open Source·Seed
UM
Umami
Simple, fast, privacy-focused web analytics
Open Source·Seed
OR
OpenReplay
Open source session replay and debugging suite
Open Source·Seed
HD
HyperDX
Open source observability platform
Open Source·Seed
DF
Dittofeed
Open source customer engagement platform
Open Source·Seed
MD
Medusa
Building blocks for digital commerce
Open Source·Series A
SL
Saleor
Open source GraphQL-first e-commerce platform
Open Source·Series A
OW
Open WebUI
ChatGPT-style UI for any LLM
Open Source·Seed
LL
LiteLLM
Call 100+ LLMs with one interface
Open Source·Seed
DE
DeepEval
The open source LLM evaluation framework
Open Source·Seed
FW
Flowise
Drag-and-drop UI to build LLM flows
Open Source·Seed
OO
OpenObserve
Open source observability with 140x lower storage costs
Open Source·Seed
SC
Screenpipe
Open source AI-powered screen and audio recorder
Open Source·Seed
SA
SuperAgent
Open source AI agent platform
Open Source·Seed