What they do:
Code and browse in the same place
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HQ: San Francisco, CA, United States
Top Developer Tools Startups in California
This list has 465 startups and was last updated on Oct 15, 2026. 133 of them are hiring right now. Biggest hubs: San Francisco (441) and Los Angeles (20). Largest teams: GitLab, PagerDuty, and Algolia. Latest round: Supabase raised $150M (Oct 2, 2026).
465 startupsPage 9 of 13
What they do:
Use Claude Code at 47% less cost in one line of installation.
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HQ: San Francisco, CA, United States
What they do:
Turning all software into agent-first APIs
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HQ: San Francisco, CA, United States
What they do:
Notion for AI chats
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HQ: San Francisco, CA, United States
What they do:
AI SRE agent that triages, coordinates, and fixes production incidents
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HQ: San Francisco, CA, United States
What they do:
API sandboxes, built for AI agents
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HQ: San Francisco, CA, United States
What they do:
Bring AI to life with the world's best interactive avatars
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HQ: Los Angeles, CA, United States
What they do:
Effortlessly deploy cloud software factories.
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HQ: San Francisco, CA, United States
What they do:
A cloud devbox that feels local
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HQ: San Francisco, CA, United States
What they do:
Self-optimizing neocloud that cuts LLM costs by 100x
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HQ: San Francisco, CA, United States
What they do:
We find where AI agents fail, then train better models to run them.
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HQ: San Francisco, CA, United States
What they do:
AI tools for the chips your AI runs on
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HQ: San Francisco, CA, United States
What they do:
Give AI agents the right context at the right moment
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HQ: San Francisco, CA, United States
What they do:
Automate on-call at agent-scale.
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HQ: San Francisco, CA, United States
What they do:
The AI coding agent for C and C++
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HQ: San Francisco, CA, United States
What they do:
The infrastructure to run coding agents for your team
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HQ: San Francisco, CA, United States
What they do:
The people data company for the agent era
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HQ: San Francisco, CA, United States
What they do:
API simulators for testing and training agents locally
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HQ: San Francisco, CA, United States
What they do:
Turn any website into an MCP for your agents, in minutes
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HQ: San Francisco, CA, United States
What they do:
reducing agent reasoning into a graph search problem
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HQ: San Francisco, CA, United States
What they do:
Cloud development environments for AI coding
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HQ: San Francisco, CA, United States
What they do:
Tumult is building the next generation of apps for web design. Our…
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HQ: San Francisco, CA, United States
What they do:
Universal, Pure-GPU HTML Renderer
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HQ: San Francisco, CA, United States
What they do:
Build UI fast.
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HQ: San Francisco, CA, United States
What they do:
Faster processors for solving NP-complete problems
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HQ: San Diego, CA, United States
What they do:
AI Agent for Billpay platforms to pay invoices with virtual cards
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HQ: San Francisco, CA, United States
What they do:
Transform Document Workflows with AI Agents
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HQ: San Francisco, CA, United States
What they do:
The simplest way to extract web data at scale
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HQ: San Francisco, CA, United States
What they do:
Specialized agents for real work
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HQ: Los Angeles, CA, United States
What they do:
Make your LLMs 3x faster.
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HQ: San Francisco, CA, United States
What they do:
Turning messy inboxes into ERP-Ready Data
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HQ: San Francisco, CA, United States
What they do:
Verify AI-generated code before you ship it
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HQ: San Francisco, CA, United States
What they do:
Agentic AI Security and Governance
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HQ: San Francisco, CA, United States
What they do:
ChatGPT's memory feature in an open, portable format
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HQ: San Francisco, CA, United States
What they do:
The browser for agentic development
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HQ: San Francisco, CA, United States
What they do:
The Git forge for the next hundred billion commits
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HQ: San Francisco, CA, United States