What they do:
Cosmic is an AI-powered headless CMS
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HQ: San Francisco, CA, United States
Top Developer Tools Startups
This list has 794 startups and was last updated on Oct 16, 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 10 of 23
Deepnote
Hiring
What they do:
A better data science notebook.
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HQ: San Francisco, CA, United States
What they do:
Open source agent generation framework
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HQ: San Francisco, CA, United States
What they do:
Safer, faster dependency upgrades
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HQ: New York, NY, United States
QuestDB
Hiring
What they do:
Data platform for mission-critical real-time workloads
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HQ: London, United Kingdom
YC S20Early stage
What they do:
The complete production quality platform. AI-powered E2E testing,…
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HQ: Limerick, Ireland
What they do:
Bare-metal access to Brazil's Open Finance and Pix systems
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What they do:
Unifying how the optical industry does business.
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HQ: Los Angeles, CA, United States
Automat
Hiring
What they do:
Agentic automation that understands context, recovers, and improves.
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HQ: San Francisco, CA, United States
YC W23Growth stage
What they do:
Helps teams work effectively with AI coding agents.
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HQ: San Francisco, CA, United States
What they do:
Generate fast, reliable APIs for any platform
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HQ: San Francisco, CA, United States
What they do:
The intelligent inbox that works for you
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Emergent
Hiring
What they do:
AI app builder that turns your ideas into monetizable software.
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HQ: San Francisco, CA, United States
YC S24Growth stage
What they do:
The UI framework for AI agents and developers to build beautiful apps.
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HQ: Buenos Aires, Argentina
What they do:
The most powerful sandboxes for AI Agents
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HQ: San Francisco, CA, United States
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:
Create, Share, Play Mobile Games on the iPad.
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HQ: London, Canada
What they do:
Full-service web, mobile, & cloud studio providing professional…
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HQ: Austin, TX, United States
What they do:
On demand ephemeral environments to run manual and automated tests.
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What they do:
Turns spreadsheets into internal apps and customer portals
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HQ: London, United Kingdom
What they do:
Better, faster tech vendor research
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HQ: Los Angeles, CA, United States
What they do:
Continuous Documentation To End Documentation Rot
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What they do:
The notification inbox for web/mobile applications.
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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:
Lovable for non-tech users: Build no-code internal and customer apps
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HQ: Porto, Portugal
What they do:
The open-source AI platform enterprises run on their own hardware
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HQ: Los Angeles, CA, United States