Y Combinator W23
YC Winter 2023 developer tools companies
Security infrastructure for developers and agents
70 people · San Francisco, CA, USA · Developer Tools, Security, Open Source · YC page
AI-based full stack observability platform
40 people · San Francisco, CA, USA · AIOps, AI · YC page
Offensive security for the teams that are 100x outnumbered
29 people · Paris, Île-de-France, France · Developer Tools, Security, API, GraphQL · YC page
The #1 Actionable FinOps Platform
25 people · Berlin, Berlin, Germany · Developer Tools, FinOps · YC page
Production-ready document processing
25 people · New York City, NY, USA · Documents, Developer Tools, AI · YC page
Build your control plane to deploy your product in your customer VPC…
25 people · San Francisco, CA, USA · Developer Tools, Cloud Computing, Infrastructure, AI · YC page
Software delivery built for machine scale.
22 people · Remote · Developer Tools, DevOps · YC page
Call every LLM API like it's OpenAI [100+ LLMs]
20 people · San Francisco, CA, USA · AIOps, Developer Tools, Generative AI, Open Source · YC page
Build AI Agent teammates and automations in code or no-code
18 people · San Francisco, CA, USA · Developer Tools, Workflow Automation, Customer Support, No-code · YC page
Build and deploy fully‑managed AI agents and workflows
17 people · London, England, United Kingdom · Developer Tools, Open Source, AI · YC page
Fully Agentic SWE
12 people · London, England, United Kingdom · Developer Tools, Generative AI, Machine Learning, NLP · YC page
The programming language for AI
10 people · Seattle, WA, USA · Developer Tools, Generative AI, Machine Learning, AI · YC page
Pierre is a new, opinionated, git platform.
10 people · San Francisco, CA, USA · AI-Enhanced Learning, Developer Tools, Productivity, Collaboration · YC page
The operating system for building mission-critical enterprise apps.
10 people · San Francisco, CA, USA · Developer Tools, Open Source, Web Development, Infrastructure · YC page
Design and explain complex software architecture.
9 people · North Vancouver, BC, Canada · Developer Tools, Collaboration, Enterprise · YC page
Your best friend in production.
8 people · Bengaluru, KA, India · Developer Tools · YC page
Building infrastructure tools to help large companies customize their…
7 people · San Francisco, CA, USA · Developer Tools, Generative AI, AI · YC page
Webflow for the Backend
7 people · New York City, NY, USA · Developer Tools, API, No-code · YC page
PaaS-like experience with the power of Kubernetes, on your cloud
7 people · Tel Aviv-Yafo, Tel Aviv District, Israel · Developer Tools, Kubernetes, DevOps · YC page
A single API for all your integrations
6 people · San Francisco, CA, USA · Developer Tools, Open Source, API · YC page
Plaid for Commercial Real Estate
6 people · Boston, MA, USA · Developer Tools, Proptech, API · YC page
Rivet Actors are the primitive for stateful workloads
5 people · San Francisco, CA, USA · Open Source, Infrastructure · YC page
Dataset Management for AI Trainers
4 people · New York City, NY, USA · Developer Tools, Generative AI, Machine Learning, DevOps · YC page
Design and build great interfaces
3 people · Remote · Developer Tools, Design, Design Tools, Web Development · YC page
Automating root cause analysis with generative AI
3 people · New York City, NY, USA · Developer Tools, Generative AI, AI · YC page
High-performance computing cloud
2 people · Berlin, Berlin, Germany · Developer Tools, Infrastructure · YC page
Turn your ideas into full-stack apps
2 people · Developer Tools, AI, AI Assistant · YC page
AI coding copilot engineered for performance
2 people · San Francisco, CA, USA · Developer Tools, Chatbot, Enterprise, AI · YC page
Cloud Native SIEM (alternative to Splunk/Elastic)
2 people · Seattle, WA, USA · DevSecOps, Analytics, Open Source, Cybersecurity · YC page
Deploy Machine Learning Models with One Command
2 people · San Francisco, CA, USA · AIOps, Machine Learning, API, AI · YC page
Your self-generating, self-maintaining code knowledge base.
2 people · San Francisco, CA, USA · Developer Tools, AI Assistant · YC page
Programmable API gateway that makes APIs cacheable
2 people · Bengaluru, KA, India · Developer Tools, API · YC page
Create, edit, and share procedural material graphs.
1 person · Pittsburgh, PA, USA · Developer Tools, Gaming, Design Tools, AI · YC page
Transform Document Workflows with AI Agents
1 person · San Francisco, CA, USA · Developer Tools, Generative AI · YC page
Agentic automation that understands context, recovers, and improves.
San Francisco, CA, USA · Documents, Developer Tools, Robotic Process Automation, Automation · YC page
Remote Shell Access in the Browser
San Francisco, CA, USA · Open Source · YC page
Instantly offer SDKs and API Docs
30 people · New York City, NY, USA · Developer Tools, Open Source, API · YC page
Open source LLM engineering platform
26 people · Berlin, Berlin, Germany · Developer Tools, Generative AI, Analytics, Open Source · YC page
Agentic integrations & automations for enterprise
16 people · Manchester, England, United Kingdom · API, No-code, Data Engineering · YC page
Know what your LLM is doing — and why it’s failing
9 people · Tel Aviv-Yafo, Tel Aviv District, Israel · Developer Tools, Generative AI, Open Source · YC page
The open source, fullstack monitoring platform: stop guessing why…
8 people · Seattle, WA, USA · Developer Tools, Open Source, Monitoring · YC page
Autofix your software dependencies
5 people · San Francisco, CA, USA · DevSecOps, Security · YC page
LLM Observability for Developers
5 people · San Francisco, CA, USA · AIOps, Developer Tools, Analytics, Open Source · YC page
The open-source AIOps platform
5 people · Tel Aviv-Yafo, Tel Aviv District, Israel · Open Source, Monitoring · YC page
Speed up customer implementation with AI
5 people · Data Engineering, Infrastructure, AI · YC page
Open Source Embedded Product Integrations
4 people · Remote · Developer Tools, Open Source, AI · YC page
The interface for your database
4 people · Pittsburgh, PA, USA · Developer Tools, Generative AI, Analytics, Data Engineering · YC page
Open source Voice AI
3 people · San Francisco, CA, USA · Developer Tools, Generative AI, Open Source, Conversational AI · YC page
Cloud-native stream processing
2 people · San Francisco, CA, USA · Developer Tools, Open Source, Cloud Computing · YC page
Open source tools & services for reliable AI Agents & AI Applications
2 people · San Francisco, CA, USA · AIOps, Developer Tools, Generative AI, Open Source · YC page
AI platform for investigating and resolving engineering incidents
5 people · San Francisco, CA, USA · Developer Tools, DevOps, AI, AI Assistant · YC page
AI-Native Enterprise Codebase Maintenance
3 people · Developer Tools, Enterprise, AI · YC page
API that adds cloud hosting to any developer platform
2 people · Seattle, WA, USA · Developer Tools, Cloud Computing, Infrastructure · YC page
Helps Developers build stunning UI Lightning Fast ⚡️
2 people · Bengaluru, KA, India · Developer Tools, Productivity, AI · YC page
Zero infrastructure background processing platform.
2 people · Paris, Île-de-France, France · Developer Tools · YC page
AI-powered data extraction engine
2 people · San Francisco, CA, USA · Developer Tools, Generative AI, Enterprise · YC page
The Gen AI evaluation and curation platform
2 people · Tel Aviv-Yafo, Tel Aviv District, Israel · Developer Tools, Generative AI, AI · YC page
Open source build tool for monorepos and large codebases
2 people · Portland, OR, USA · Developer Tools, Productivity, Open Source, Enterprise · YC page
Resolve PR check failures instantly with AI
1 person · San Francisco, CA, USA · DevOps, AI · YC page
FAQ
How many developer tools companies are in YC Winter 2023 (W23)?+
59 launched companies in YC Winter 2023 carry a developer-tools or infrastructure tag in YC's directory (snapshot of 2026-10-20); 36 are active. Companies that have not launched publicly on YC's site yet are not counted.
What are the top tags in YC W23 dev tools?+
Developer Tools (49), AI (27), Open Source (19), Generative AI (14), API (8). 19 of 59 are tagged open source.
Which YC W23 dev-tool companies are the largest?+
By team size on YC's directory: Infisical, Middleware, Escape.
← Summer 2023Summer 2022 →All YC dev-tool companiesOpen-source YC companies
Source: Y Combinator's public company directory via the unofficial mirror yc-oss/api. DevHunt is not affiliated with Y Combinator.