What they do:
Replay real customer journeys against every change before you ship
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HQ: New York, NY, United States
Top Developer Tools Startups
This list has 794 startups and was last updated on Oct 15, 2026. 187 of them are hiring right now. Biggest hubs: San Francisco (441), New York (75), and London (39). Largest teams: GitLab, PagerDuty, and Algolia. Latest round: Coding Giants raised €6M (Oct 14, 2026).
Survival statistics →886 open roles →
794 startupsPage 14 of 23
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:
We turn complex API integrations into drop‑in full‑stack libraries
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HQ: Amsterdam, Netherlands
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:
Persistent email inbox, phone number and secret storage for agents
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HQ: London, United Kingdom
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:
Grammarly for Math ✏️
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HQ: London, United Kingdom
What they do:
Abundant Intelligence for Everyone
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HQ: San Francisco, CA, United States
What they do:
Experiment tracking for training ML models
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HQ: London, United Kingdom
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
What they do:
Privileged Access Management for AI Agents
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HQ: New York, NY, United States
What they do:
Run open models as fast as your hardware allows
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HQ: San Francisco, CA, United States
What they do:
Turns products into CLIs and agents into customers
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HQ: San Francisco, CA, United States
What they do:
We help non-technical teams build AI agents without engineers
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HQ: Brussels, Belgium
What they do:
Find what's losing you customers and money in your AI agent and fix it
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HQ: San Francisco, CA, United States
What they do:
The Routing Layer for AI Agents
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HQ: San Francisco, CA, United States
What they do:
AI Agents for Platform Engineering
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HQ: San Francisco, CA, United States
What they do:
Self-tuning search for products and files
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HQ: San Francisco, CA, United States
What they do:
The coding agent that actually collaborates with you
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HQ: San Francisco, CA, United States
What they do:
Code and browse in the same place
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HQ: San Francisco, CA, United States
What they do:
The cloud platform built for coding agents
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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