Grai
Shut down
What they do:
Open source version control for metadata
Quick facts:
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 13 of 13
Lantern
Shut down
What they do:
Postgres vector database extension to build AI applications
Quick facts:
HQ: San Francisco, CA, United States
Fileforge
Shut down
What they do:
API For PDF Document Workflows
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HQ: San Francisco, CA, United States
Percival
Shut down
What they do:
Accelerating data analysis for research
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HQ: San Francisco, CA, United States
Rovr
Shut down
What they do:
AI FDE Engine that runs your engineering workflows
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HQ: San Francisco, CA, United States
Flotype
Shut down
What they do:
Third generation of web apps.
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HQ: San Francisco, CA, United States
NudgePad
Shut down
What they do:
Online IDE. We joined Microsoft in 2014.
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HQ: San Francisco, CA, United States
Framebase
Shut down
What they do:
API for video.
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HQ: San Francisco, CA, United States
StackMachine
Shut down
What they do:
Instant sandboxed server environments
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HQ: San Francisco, CA, United States
Kivo
Shut down
What they do:
Git for Documents
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HQ: San Francisco, CA, United States
Omniref
Shut down
What they do:
Sticky notes for code. (We're building a community-powered,…
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HQ: San Francisco, CA, United States
Scanate/Fellow
Shut down
What they do:
API for Invoice Financing
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HQ: San Francisco, CA, United States
Basilica
Shut down
What they do:
Basilica is an API that embeds high-dimensional data like images and…
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HQ: San Francisco, CA, United States
Tensil
Shut down
What they do:
We turn machine learning models into custom hardware.
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HQ: San Francisco, CA, United States
Monosi
Shut down
What they do:
Open Source Data Observability
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HQ: San Francisco, CA, United States
Dittofeed
Shut down
What they do:
Open-source customer engagement & messaging automation
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HQ: Los Angeles, CA, United States
BricksAI
Shut down
What they do:
Streamlining LLM application management for enterprises
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HQ: San Francisco, CA, United States
Indexical
Shut down
What they do:
AI-powered data extraction engine
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HQ: San Francisco, CA, United States
Vango AI
Shut down
What they do:
Development platform that makes it 10x easier to improve visual models
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HQ: San Francisco, CA, United States
Gait
Shut down
What they do:
Building Dev Infra for AI Software Engineers
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HQ: San Francisco, CA, United States
Sublingual
Shut down
What they do:
Daily productivity tracker
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HQ: San Francisco, CA, United States
Mendral
Shut down
What they do:
AI DevOps Engineer
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HQ: San Francisco, CA, United States
Scout
Shut down
What they do:
Dead simple CI/CD for ML teams
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HQ: San Francisco, CA, United States
Metamanagement
Shut down
What they do:
We help SaaS companies deploy into their customer's environment.
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HQ: San Francisco, CA, United States
SensorSurf
Shut down
What they do:
Resolve PR check failures instantly with AI
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HQ: San Francisco, CA, United States
Celest
Shut down
What they do:
The Vercel of Flutter
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HQ: San Francisco, CA, United States
Brace
Shut down
What they do:
Backlift allows front-end only developers to build entire websites…
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HQ: San Francisco, CA, United States
YC W12Early stage
Proxino
Shut down
What they do:
Javascript proxy.
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HQ: San Francisco, CA, United States
YC S11Early stage
Appcubator
Shut down
What they do:
The easiest way to prototype web applications.
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HQ: San Francisco, CA, United States
YC W13Early stage
Haiku
Shut down
What they do:
Collaboration tools for software companies
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HQ: San Francisco, CA, United States
Openbase
Shut down
What they do:
Open-source library discovery
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HQ: San Francisco, CA, United States
Kable
Shut down
What they do:
Usage-based billing for API companies
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HQ: Los Angeles, CA, United States
Galaxy
Shut down
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HQ: San Francisco, CA, United States