← Startups in San Francisco

San Francisco Open Source 90 startups

"Open Source" Startups in San Francisco

Every active San Francisco startup we index that carries the "Open Source" tag.

All startups in San Francisco → "Open Source" startups nationwide →

Last updated

2026-09-02

Hiring right now 16% 14 of 90

Open roles 444

City San Francisco

Our index currently lists 90 tech startups in San Francisco tagged "Open Source" — a city×tag slice of the live directory, not every "Open Source" company nationwide and not every San Francisco startup regardless of tag. 16% of this slice is hiring right now (14 of 90). Apply links on each profile go to the company's own site; we don't act as a middleman. "Open Source" startups in San Francisco include Supabase, PostHog, Docker, GitLab, and LanceDB. Categories represented here: AI / ML, Infrastructure, and Dev Tools. YC batches in this slice: W23, S24, S26, and W21, among others. Widen the view anytime: all San Francisco startups at /startups/location/san-francisco, or every "Open Source" company nationwide at /startups/tag/open-source.

Build in a weekend. Scale to millions.

Developer ToolsOpen SourceBig Data

The single platform to analyze, test, observe, and deploy new features

Developer ToolsB2BOpen Source

Software development platform.

Open SourceDevOpsEnterprise Software

A complete DevOps platform delivered as a single application.

Developer ToolsDevSecOpsOpen Source

Open-source, serverless vectordb for production-scale generative AI

AIOpsMachine LearningOpen Source

A single API for all your integrations

Developer ToolsSaaSOpen Source

Database for AI

Computational StorageDeep LearningGenerative AI

Open-source, AI-first and no-code business automation tool

Workflow AutomationOpen SourceNo-code

Context layer for production-grade AI agents

Artificial IntelligenceDeveloper ToolsOpen Source

Apollo helps engineering teams accelerate delivery

Developer ToolsOpen SourceGraphQL

Cloud-native stream processing

Developer ToolsSaaSOpen Source

The authentication framework for TypeScript

Developer ToolsSecurityOpen Source

Leading open-source web agent project with 50k stars in 3 months

Artificial IntelligenceOpen SourceAPI

Bun is an incredibly fast all-in-one JavaScript toolkit

Developer ToolsOpen Source

Low-latency AI engine for mobile devices & wearables

Artificial IntelligenceDeveloper ToolsHard Tech

The modern, open source, self-hosted AI customer support platform

B2BCustomer SuccessOpen Source

Real-time. Big data. PostgreSQL

Open SourceBig DataDatabases

The Authorization Layer for AI Agents

Artificial IntelligenceSecurityOpen Source

The LLM Eval and Observability Platform for AI Quality

Developer ToolsGenerative AIOpen Source

Open source tools of modern distributed systems.

Open SourceDevOps

Give every agent a cloud desktop

Open source tools & services for reliable AI Agents & AI Applications

AIOpsArtificial IntelligenceDeveloper Tools

Conversational Voice and Multimodal AI built with Open Source

Developer ToolsOpen SourceAI

Workspace for your AI Agents, Build any Workflow.

Workflow AutomationOpen SourceCRM

ChatGPT's memory feature in an open, portable format

SaaSProductivityOpen Source

Fig adds visual apps, shortcuts, and autocomplete to your terminal.

Developer ToolsDevSecOpsOpen Source

The API to search, scrape, and interact with the web at scale. 🔥

Developer ToolsOpen SourceAI

Easiest way to set up Zero Trust Access for your team

DevSecOpsNext-gen Network SecurityB2B

We run and deploy code your AI wrote

Developer ToolsOpen SourceWeb Development

Open source feature flagging and A/B testing

Developer ToolsB2BAnalytics

LLM Observability for Developers

AIOpsDeveloper ToolsAnalytics

Serverless Analytics on Postgres

Developer ToolsAnalyticsOpen Source

Open-source, dev-friendly observability.

Developer ToolsSaaSB2B

Unified platform for secrets, certs, and privileged access management

Developer ToolsSaaSB2B

The agent-native AWS

Developer ToolsOpen SourceInfrastructure

Generative AIConsumerProductivity

KV Cash, a blockchain where contracts can finally think

Crypto / Web3Open SourceAI

The AI Native Billing Platform

FinOpsFintechSaaS

Open source mobile marketing platform. Alternative to appcues /…

SaaSB2BOpen Source

Call every LLM API like it's OpenAI [100+ LLMs]

AIOpsArtificial IntelligenceDeveloper Tools

Code with local models, zero setup

Artificial IntelligenceDeveloper ToolsOpen Source

Open source applied AI lab building next-gen devtools

Artificial IntelligenceDeveloper ToolsOpen Source

Cloud infrastructure for MCP servers and Claude / ChatGPT apps.

Developer ToolsB2BOpen Source

The Javascript framework for building AI agents, from the Gatsby devs

Artificial IntelligenceDeveloper ToolsOpen Source

Secure Collaboration for Technical Teams

DevSecOpsCollaborationSecurity

API first electronic health record (EHR) that is open source

Developer ToolsOpen SourceHealthcare

The Memory layer for AI Agents

Developer ToolsGenerative AIOpen Source

Building the open source smart glasses operating system.

Artificial IntelligenceHardwareConsumer

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1 of 4 similar companies is hiring right now · most common: Engineering

Secure Enterprise Collaboration.

CollaborationSecurityEnterprise

Email for developers

EmailDeveloper InfrastructureSaaS

Building the definitive all-in-one on-device AI productivity tool

Artificial IntelligenceOpen SourceAI Assistant

Build AI Agent teammates and automations in code or no-code

Developer ToolsWorkflow AutomationCustomer Support

All startups in San FranciscoEvery tag "Open Source" startups nationwideEvery city "Artificial Intelligence" startups in San Francisco606 startups "AI" startups in San Francisco572 startups "B2B" startups in San Francisco520 startups "SaaS" startups in San Francisco428 startups "Developer Tools" startups in San Francisco307 startups "Fintech" startups in San Francisco180 startups "Generative AI" startups in San Francisco137 startups "Consumer" startups in San Francisco120 startups

Frequently asked questions

How many "Open Source" startups are in San Francisco?

Our index currently tracks 90 active tech startups in San Francisco tagged "Open Source". Counts move as scrapers discover new companies and flag shutdowns inactive.

Which "Open Source" startups are based in San Francisco?

Companies on this page include Supabase, PostHog, and Docker, plus 87 more below. Each profile links to the company's site and any open roles we scrape.

How is this different from the San Francisco startups page or the "Open Source" tag page?

/startups/location/san-francisco lists every indexed startup in San Francisco across tags. /startups/tag/open-source lists every "Open Source" startup nationwide. This page is the intersection — only companies that resolve to both San Francisco and "Open Source".

Are these San Francisco "Open Source" startups hiring?

14 of the 90 companies on this page currently have open roles in our jobs index.

How often is this list updated?

Automated scrapers refresh on the same daily cadence as the rest of the directory. The last index update was 2026-09-02.