Y Combinator S26
YC Summer 2026 developer tools companies
AI engineer that debugs and fixes production incidents in realtime
8 people · San Francisco, CA, USA · AIOps, Developer Tools, DevOps, AI · YC page
We give AI agents realtime web context via API
6 people · San Francisco, CA, USA · AI, APIs · YC page
Hosting platform for software you can't afford to have hacked
5 people · George Town, George Town, Cayman Islands · Cybersecurity, Cloud Computing, Infrastructure · YC page
Earned intelligence for every company
5 people · San Francisco, CA, USA · Developer Tools, Reinforcement Learning, Infrastructure, AI · YC page
Least cost routing system to reduce 70%+ token spend
4 people · San Francisco, CA, USA · Developer Tools, Security, AI · YC page
The cheapest, fastest inference cloud
4 people · San Francisco, CA, USA · Open Source, Infrastructure, AI · YC page
AI that turns any camera to an autonomous worker with real-time vision
4 people · San Francisco, CA, USA · Robotics, Computer Vision, Infrastructure, Industrial · YC page
OpenRouter for Voice AI: one API, every call on the best speech model
4 people · San Francisco, CA, USA · Developer Tools, AI, Conversational AI · YC page
Reliable infrastructure to build, deploy and manage real-world robots.
3 people · Denver, CO, USA · Developer Tools, Robotics, Automation, Infrastructure · YC page
Reliable and safe data engineering and data science agents
3 people · San Francisco, CA, USA · Developer Tools, Data Science, Data Engineering, Enterprise Software · YC page
Autoresearch as a service: we solve your hardest measurable problems
3 people · San Francisco, CA, USA · Developer Tools, Machine Learning, Reinforcement Learning, Infrastructure · YC page
The identity and communication layer for AI agents
3 people · San Francisco, CA, USA · Developer Tools, Infrastructure, AI · YC page
We find flaws in RL environments and evals and help you fix them.
3 people · San Francisco, CA, USA · Developer Tools, Machine Learning, Reinforcement Learning, AI · YC page
We find where AI agents fail, then train better models to run them.
2 people · San Francisco, CA, USA · Developer Tools, Machine Learning, Analytics, Monitoring · YC page
API sandboxes, built for AI agents
2 people · San Francisco, CA, USA · Developer Tools, API, Infrastructure, AI · YC page
The biggest crowdsourced benchmark for Computer-Use
2 people · San Francisco, CA, USA · AIOps, Machine Learning, Reinforcement Learning, Data Labeling · YC page
Training company-specific models that approve AI actions.
2 people · San Francisco, CA, USA · Security, Infrastructure, AI · YC page
Open source AI gateway that turns your traffic into better models
2 people · San Francisco, CA, USA · Reinforcement Learning, Infrastructure, AI · YC page
The Git forge for the next hundred billion commits
2 people · San Francisco, CA, USA · Developer Tools, DevOps, AI · YC page
AI tools for the chips your AI runs on
2 people · San Francisco, CA, USA · Developer Tools, Hardware, Enterprise Software, Semiconductors · YC page
Foundational infrastructure for Physical AI
2 people · San Francisco, CA, USA · Robotics, Data Science, Data Engineering, AI · YC page
Effortlessly deploy cloud software factories.
2 people · San Francisco, CA, USA · Developer Tools, Cloud Computing, AI · YC page
Expert computer-use data for frontier AI labs
2 people · San Francisco, CA, USA · Reinforcement Learning, Data Labeling, Data Engineering · YC page
Self-optimizing neocloud that cuts LLM costs by 100x
2 people · San Francisco, CA, USA · Open Source, AI, ML · YC page
A cloud devbox that feels local
2 people · San Francisco, CA, USA · Developer Tools · YC page
The IDE for Tokenmaxxers
2 people · Boston, MA, USA · Developer Tools, Infrastructure, AI · YC page
Market for future inference capacity
2 people · San Francisco, CA, USA · Infrastructure, AI · YC page
LLMs that control robots
2 people · San Francisco, CA, USA · Developer Tools, Generative AI, Robotics, Automation · YC page
Managed Agents API
1 person · San Francisco, CA, USA · API, Infrastructure, AI · YC page
The AI gateway for cheaper, faster, permissioned agents.
1 person · San Francisco, CA, USA · Developer Tools · YC page
The open source tool gateway
1 person · San Francisco, CA, USA · AIOps, AI · YC page
On-device Knowledge Graph engine for Enterprise Software
1 person · San Francisco, CA, USA · Developer Tools, Open Source · YC page
High performance coding agents
1 person · San Francisco, CA, USA · Developer Tools, AI · YC page
AWS for Agents
1 person · San Francisco, CA, USA · Developer Tools, Cloud Computing · YC page
Monetize your agent's traces.
1 person · San Francisco, CA, USA · Reinforcement Learning, Data Engineering, AI · YC page
Autonomous Hardware Testing
San Francisco, CA, USA · Developer Tools, Hardware · YC page
Engineering Intelligence and Token Optimization for the AI-Coding Era
San Francisco, CA, USA · Developer Tools, Machine Learning, Productivity · YC page
FAQ
How many developer tools companies are in YC Summer 2026 (S26)?+
37 launched companies in YC Summer 2026 carry a developer-tools or infrastructure tag in YC's directory (snapshot of 2026-10-20); 37 are active. Companies that have not launched publicly on YC's site yet are not counted.
What are the top tags in YC S26 dev tools?+
AI (26), Developer Tools (23), Infrastructure (13), Reinforcement Learning (7), Machine Learning (5). 3 of 37 are tagged open source.
Which YC S26 dev-tool companies are the largest?+
By team size on YC's directory: HyperProbe, Context.dev, Caution.
← Fall 2026Spring 2026 →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.