What they do:
Agents that handle security work
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HQ: New York, NY, United States
Top Developer Tools Startups in the United States
This list has 603 startups and was last updated on Oct 15, 2026. 157 of them are hiring right now. Biggest hubs: San Francisco (441), New York (75), and Los Angeles (20). Largest teams: GitLab, PagerDuty, and Algolia. Latest round: Supabase raised $150M (Oct 2, 2026).
603 startupsPage 10 of 17
What they do:
AI for humans
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HQ: San Francisco, CA, United States
What they do:
Observability and evaluation platform for LLM apps.
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HQ: San Francisco, CA, United States
What they do:
orchestrate your coding agents with sudocode
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HQ: San Francisco, CA, United States
What they do:
The open source Postman alternative.
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HQ: San Francisco, CA, United States
What they do:
the AI coding app for thinking.
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HQ: San Francisco, CA, United States
What they do:
AI system design tools for dev teams
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HQ: New York, NY, United States
What they do:
Automate bug resolution
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HQ: New York, NY, United States
What they do:
AI Agent for DevOps Workflow Automation
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HQ: New York, NY, United States
What they do:
Security for AI-native developers
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HQ: San Francisco, CA, United States
What they do:
AI agents for insurance claims
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HQ: San Francisco, CA, United States
What they do:
AI media creation platform for creators and developers
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HQ: San Francisco, CA, United States
What they do:
Build interactive applications that run anywhere
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HQ: New York, NY, United States
What they do:
Custom video detection models in less than 5 minutes
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HQ: New York, NY, United States
What they do:
Open source AI copilot that knows your company's code and its context
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HQ: San Francisco, CA, United States
What they do:
One living model of your software architecture
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HQ: San Francisco, CA, United States
What they do:
Making everyone a software engineer
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HQ: San Francisco, CA, United States
What they do:
Datadog for robots
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HQ: San Francisco, CA, United States
What they do:
API & SDK for RCS (the next-generation of texting)
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HQ: San Francisco, CA, United States
What they do:
Replay real customer journeys against every change before you ship
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HQ: New York, NY, United States
What they do:
The open source Cursor alternative
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HQ: San Francisco, CA, United States
What they do:
The best DOCX MCP for agents to edit microsoft word documents
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HQ: San Francisco, CA, United States
What they do:
The complete, collaborative workspace for humans and agents
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HQ: Los Angeles, CA, United States
What they do:
The platform for automated hiring and workforce decisions.
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HQ: San Francisco, CA, United States
What they do:
AI documentation engineer – test & autoimprove stale product docs
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HQ: San Francisco, CA, United States
What they do:
AWS for AI Agents
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HQ: San Francisco, CA, United States
What they do:
OpenRouter for Integrations
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HQ: New York, NY, United States
What they do:
The fastest native app for agentic engineering.
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HQ: San Francisco, CA, United States
What they do:
Simulation Engine for Benchmarking AI Products
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HQ: San Francisco, CA, United States
What they do:
The data gateway for agents.
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HQ: San Francisco, CA, United States
What they do:
Abundant Intelligence for Everyone
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HQ: San Francisco, CA, United States
What they do:
AI + human review to solve data cleaning - accessible via API or Excel
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HQ: New York, NY, United States
What they do:
AI agents for web testing
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HQ: San Francisco, CA, United States
What they do:
A better GItHub
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HQ: New York, NY, United States
What they do:
AI for quantitative trading
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HQ: San Francisco, CA, United States
What they do:
Self learning computer use agent for developers
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HQ: San Francisco, CA, United States