Software Development startups in San Francisco

Poolside

San Francisco

Poolside is building the world's most capable AI for software development, focusing on distributed training and inference of large language models for source code generation, with a mission to unlock developers' potential through AI for sof

Decagon

San Francisco

Decagon is a leading conversational AI platform delivering concierge customer experiences with AI agents across chat, email, and voice in any language. It serves brands like Hertz, Eventbrite, Duolingo, and Oura and is backed by Accel and A

Together AI

San Francisco

Together AI is a research-driven AI cloud infrastructure provider. Our purpose-built GPU cloud platform empowers AI engineers and researchers to train, fine-tune, and run frontier class AI models. Our customers include leading SaaS companies such as Salesforce, Zoom, and Zomato, as well as pioneering AI startups like ElevenLabs, Hedra, and Cartesia. We advocate for open source AI and believe that transparent AI systems will drive innovation and create the best outcomes for society.

Inferact

San Francisco

Inferact is a startup founded by creators and core maintainers of vLLM, the most popular open-source LLM inference engine. Our mission is to grow vLLM as the world's AI inference engine and accelerate AI progress by making inference cheaper and faster.

CodeRabbit

San Francisco

CodeRabbit is an innovative, AI-driven platform that transforms the way code reviews are done. It delivers context-aware, human-like reviews, improving code quality, reducing the time and effort required for thorough manual code reviews, and enabling teams to ship software faster. Trusted by over a thousand organizations, including The Economist, Life360, ConsumerAffairs, Hasura, and many more, to improve their code review workflow. CodeRabbit is SOC 2 Type 2, GDPR certified, and doesn't train on customer's proprietary code.

Edison Scientific

San Francisco

Edison Scientific, spun out from FutureHouse in 2025, accelerates scientific discovery by building and commercializing AI agents for science, pursuing an AI Scientist to scale autonomous research and tackle challenges such as drug developme

Runware

San Francisco

Runware delivers AI-as-a-Service at 5–10x lower cost and with higher speed than competitors. Built for scale, the service has already powered 4 billion+ creations for +100K developers and +250M end-users worldwide. Founded in 2023 and headquartered in San Francisco, Runware is backed by Insight Partners and a16z.

Rox Data

San Francisco

Rox helps businesses secure and grow revenue.

Guild.ai

San Francisco

Introducing Guild.ai. Our mission is simple: make building with AI as open and collaborative as open source. We’re creating tools for the next generation of intelligent systems, designed for builders who see craft, reliability, scale, and community as essential. By making AI development open, transparent, and collaborative, we’re enabling builders to move faster, ship with confidence, and learn from one another as they shape what comes next.

Netic

San Francisco

We help essential service industries grow on autopilot. Essential services power the real economy. Every one of us interacts with these industries repeatedly throughout our lives. But these large businesses face real-world constraints—human labor, external volatility, compliance, logistics, and physical infrastructure. Their operations are complex and often rely on outdated systems and manual workflows, and they can’t access the frontier technologies that drive digital-first businesses. In a world where startups mostly build for startups, we serve the large enterprises in real industries and end users that keep America running. We're a small team of relentless builders, ex-founders, and immigrants from top CS schools and tech companies who thrive on solving hard problems and making a tangible impact. We are backed by the best investors and founders of our generation.

Imbue

San Francisco

This company aims to rekindle the dream of personal computing by making reliable software creation accessible to all, empowering humans in an AI era with powerful computing tools and researching verification of LLM-generated code to ensure

Delve

San Francisco

Delve is an AI-native compliance company helping 700+ fast-growing firms achieve SOC 2, HIPAA, ISO, GDPR, and other standards in days, not months; trusted by Lovable, Bland, and Wispr Flow, and building an AI-native platform to automate com

Unify

San Francisco

Unify is an AI-first go-to-market platform that treats growth as a science, powering pipeline for leading teams such as Airwallex, Cursor, Perplexity, Together AI, and Guru. Founded Jan 17, 2023 by Austin Hughes and Connor Heggie, with a Li

Indent

San Francisco

Indent is a platform for large engineering teams, used for incident response, code review, and data analysis with minimal setup. It provides a cloud AI software engineer that handles the entire job, including real-world tasks like analyzing

TwelveLabs

San Francisco

The world's most powerful video intelligence platform for enterprises.

Vultron

San Francisco

Vultron helps federal contractors win contracts by delivering compliant proposal drafts and compressing weeks of work into days. It is trusted by 400+ federal contractors and has enabled $2.2B in contract wins, using proprietary models trai

Encord

San Francisco

Encord offers a multimodal data labeling, curation and evaluation platform for AI, built by quants, physicists and computer scientists; backed by CRV and YC, it is SOC 2, HIPAA and GDPR compliant and serves customers including Synthesia and

DayDream

San Francisco

Daydream is a SaaS platform that automates the entire programmatic SEO workflow, aiming to streamline programmatic SEO engines. Despite being pre-launch, it has reported rapid ARR growth month over month and plans a GA product, with LLMs in

Browser Use

San Francisco

The company specializes in animating web agents, bringing them to life as living entities on the web.

Blacksmith

San Francisco

Blacksmith offers a platform to run GitHub Action workflows and has raised $13.5M in funding from Google Ventures, positioning itself as the fastest way to run GitHub Action workflows.

Hamilton AI

San Francisco

Hamilton AI is building the operating system for business aviation, replacing fragmented communications with a fully integrated platform that uses AI to support scheduling, trip management, and operational decision-making, delivering real-t

Dosu

San Francisco

Dosu makes engineering knowledge accessible to developers, empowering the community with AI-driven tools. A small San Francisco-based team backed by over $9M in funding, its software is used on thousands of open-source GitHub repos and supp

Blaxel

San Francisco

Blaxel is a computing platform that gives AI builders the toolbox & infrastructure to build and deploy agents efficiently. ⠀ Billions of agents, tools, and models will transform how we work in the coming years. Traditional clouds were built for humans but the future of cloud is agentic. We fixed that with Blaxel. ⠀ Blaxel is a complete cloud purpose-built for agents, either to build them or be consumed by them: - all services for software engineers to fast-track deploying agents without reinventing the wheel — like framework-agnostic serverless deployments, an AI gateway for model routing and fallback, and custom MCP server hosting. - a flexible low-level API for builders to ship really performant agentic AI using our backbone infrastructure — using services like sandboxed VMs usable by agents, a programmable global gateway, and a 20ms-latency serverless compute engine.

Assert

San Francisco

Assert.dev is building a modern code-review interface for AI-enabled development, guided by the slogan "Code is meant to be run, not read." It operates the assert.dev website and aims to modernize code review for the AI era.

Freckle

San Francisco

Freckle is a data orchestration platform for modern GTM teams, dedicated to orchestrating data for GTM initiatives and aiming to be the go-to solution in this space.

Infilla

San Francisco

Infilla is a startup aiming to accelerate housing by fixing the permit process, the slowest part of building. It has raised $5 million from investors and reports demand, supported by a team with experience at Dropbox, Discord, Affirm, and M

Taya

San Francisco

Taya is a jewelry company that creates meaningful keepsakes designed to commemorate personal moments, branding memory at its core and inviting customers to own their moments.

Vals AI

San Francisco

Vals AI is building the standard for evaluating real-world performance of large language models, originating from Stanford NLP evaluation research. Its $5 million seed round and its evaluations are used by major foundation model labs, enter

Thatch

San Francisco

Thatch is an all-in-one platform that makes it easy to offer your employees the most personalized healthcare experience. You decide what to spend, and your team gets great health benefits.

Krea

San Francisco

Krea develops next-generation AI creative tools that are intuitive and controllable for creatives, aiming to empower human expression across text, image, video, sound, and 3D rather than replace artists.

Secureframe

San Francisco

Secureframe provides seamless cybersecurity compliance software for thousands of businesses, aiming to revolutionize the field; recognized as a trusted leader by Forbes, TechCrunch, and The Wall Street Journal, and backed by Kleiner Perkins

Theta

San Francisco

Theta translates real-world workspaces into simulation environments and trains expert-level agents that deeply understand those environments.

Ivo

San Francisco

Ivo develops generative AI products for legal teams and an AI-native platform that automates contract review and other legal work, helping teams reduce time, effort, and cost and accelerate time-to-close.

MERGE

San Francisco

Merge is a leading provider of customer-facing integrations and agent tools for frontier LLMs, serving thousands of customers including Fortune 500s and B2B SaaS firms, with offices in San Francisco, New York, and Berlin.

Fazeshift

San Francisco

Fazeshift offers an AI-driven accounts receivable platform that automates AR processes, reduces manual work, and accelerates revenue cycles for large enterprises. Backed by Y Combinator, Gradient (Google’s AI venture arm), and founded by Ha

Ciridae

San Francisco

Ciridae delivers AI deployment for private equity-backed clients, employing a Palantir-style forward-deployed model and an internal platform to enable rapid AI deployment. It is expanding from services to software, combining hands-on deploy

Phonic

San Francisco

Reliable Voice AI

Newton

San Francisco

Newton offers a next-generation AI phone system for dental organizations, targeting fast-growing dental groups to streamline patient communication and replace outdated phone systems and clunky tools, delivering unmatched visibility into the

Tavus

San Francisco

Tavus is a human computing research lab and pioneer in human computing, building AI Humans to bridge the gap between people and machines and teach machines to be human. Founders Hassaan Raza and Quinn Favret lead Tavus, which is growing.

Incident.io

San Francisco

Incident.io is an all-in-one incident management platform for engineering teams, integrating on-call scheduling, incident response, and status pages with AI-powered automation, serving 10,000+ responders at 600+ companies including Netflix,