What they do:
The most powerful sandboxes for AI Agents
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HQ: San Francisco, CA, 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 8 of 17
What they do:
AI app builder for creating and launching iPhone apps
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HQ: San Francisco, CA, United States
What they do:
Encrypted AI with verifiable privacy
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HQ: San Francisco, CA, United States
What they do:
Turn scattered data into one platform for decision-making
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HQ: San Francisco, CA, United States
What they do:
The E2E testing layer for AI-driven development
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HQ: San Francisco, CA, United States
Proliferate
Hiring
What they do:
Do your life's work with agents
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HQ: San Francisco, CA, United States
YC S25Early stage
What they do:
AI agents for E2E testing across mobile & web
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HQ: San Francisco, CA, United States
What they do:
Browser infra for AI agents: sessions, auth, proxies, payments
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HQ: San Francisco, CA, United States
What they do:
API for unlimited, durable, real-time streams
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HQ: San Francisco, CA, United States
What they do:
Simulate your customers with AI agents
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HQ: Boston, MA, United States
What they do:
Earned intelligence for every company
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HQ: San Francisco, CA, United States
What they do:
Full-service web, mobile, & cloud studio providing professional…
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HQ: Austin, TX, United States
What they do:
Better, faster tech vendor research
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HQ: Los Angeles, CA, United States
What they do:
Classify Anything
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HQ: CA, United States
What they do:
Internal developer platform for Terraform, OpenTofu and Helm
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HQ: Los Angeles, CA, United States
What they do:
Building the definitive all-in-one on-device AI productivity tool
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HQ: Los Angeles, CA, United States
What they do:
Dataset Management for AI Trainers
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HQ: New York, NY, United States
What they do:
An all-in-one platform for building internal agents & workflows
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HQ: Salt Lake City, UT, United States
What they do:
QA agents that write tests 10x faster with zero maintenance
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HQ: San Francisco, CA, United States
What they do:
The authentication framework for TypeScript
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HQ: San Francisco, CA, United States
What they do:
The Open-Source Alternative to Claude Managed Agents
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HQ: San Francisco, CA, United States
What they do:
Build an API to interact with any website.
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HQ: San Francisco, CA, United States
What they do:
The cheapest, fastest inference cloud
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HQ: San Francisco, CA, United States
What they do:
/dev/fast is the AI-native code forge
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HQ: San Francisco, CA, United States
What they do:
OpenRouter for Voice AI: one API, every call on the best speech model
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HQ: San Francisco, CA, United States
What they do:
Least cost routing system to reduce 70%+ token spend
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HQ: San Francisco, CA, United States
What they do:
Making the JVM faster
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HQ: San Francisco, CA, United States
What they do:
Cursor for data analysis
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HQ: New York, NY, United States
What they do:
Easiest way to set up Zero Trust Access for your team
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HQ: San Francisco, CA, United States
What they do:
Zero-Knowledge security without seed phrases or backup codes
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HQ: Denver, CO, United States
What they do:
Deploy serverless without rewriting code
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HQ: San Francisco, CA, United States
What they do:
Automating root cause analysis with generative AI
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HQ: New York, NY, United States
What they do:
Infrastructure for managing GPU clusters for training/serving.
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HQ: San Francisco, CA, United States
What they do:
Infuse knowledge into language models with just 10 samples
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HQ: San Francisco, CA, United States
What they do:
High precision AI weather
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HQ: Ann Arbor, MI, United States
What they do:
Optimize performance on GPUs - 10x faster
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HQ: New York, NY, United States