Nov 17, 2025 05:21:33 AM

Companies


Showing 4326-4350 of 5661 companies
YC S11
Sift logo

Sift

The Leader in Digital Trust & Safety

Sift is the leader in Digital Trust & Safety, empowering digital disruptors to Fortune 500 companies to unlock new revenue without risk. Sift dynamically prevents fraud and abuse through industry-leading technology and expertise, an unrivaled global data network of 70 billion events per month, and a commitment to long-term customer partnerships. Global brands such as DoorDash, Twitter, and Wayfair rely on Sift to gain a competitive advantage in their markets.

YC W22
Siftly logo

Siftly

Get your brand discovered and recommended by ChatGPT

Siftly helps brands measure, improve, and scale their visibility inside AI assistants like ChatGPT, Gemini, and Perplexity. We track how your brand is surfaced, compared, and recommended and give you actionable insights to win AI-driven discovery. Think of it as SEO for the AI era, built for B2B, B2C, D2C, and e-commerce growth teams.

YC W21
SigNoz logo

SigNoz

Open source alternative to DataDog

SigNoz is an open-source observability platform native to OpenTelemetry with logs, traces and metrics in a single application. An open-source alternative to DataDog, NewRelic, etc. Open source Application Performance Monitoring (APM) & Observability too

YC W15
SigOpt logo

SigOpt

SigOpt is an Optimization-as-a-Service platform that seamlessly tunes…

SigOpt is the optimization platform that amplifies your research. SigOpt takes any research pipeline and tunes it, right in place. Our cloud-based ensemble of optimization algorithms is proven and seamless to deploy, and is used by globally recognized leaders within the insurance, credit card, algorithmic trading and consumer packaged goods industries.

YC S21
Siglo logo

Siglo

Home Internet for urban Latin America

Siglo is a wireless ISP for communities in urban Latin America offering a faster, better, and easy-to-pay service.

YC W17
Sigma Genetics logo

Sigma Genetics

Sigma Genetics is a biotechnology company that is building…

Sigma Genetics develops devices that can deliver DNA, RNA, and other charged molecules into cells by using magnetic fields. When compared to conventional electroporation, this technique has several key advantages, which include: the absence of arcing, the ability to scale, and the benefit of being non-invasive for in vivo applications. This platform technology can be applied to a wide range of applications- cell therapies, cancer drug delivery, DNA vaccines, biopharma manufacturing, and cosmetics.

YC S22
SigmaMind AI logo

SigmaMind AI

Platform to build enterprise-ready voice/chat agents

SigmaMind AI is a conversational AI platform to deploy voice, chat & email agents. Build with our no-code agent builder or plug into APIs. Prebuilt integrations + support for custom tools = fast, flexible deployment across industries.

YC S21
SigmaOS logo

SigmaOS

The new home for your internet 🏡

SigmaOS is a new type of browser designed for founders, researchers, and content creators to make you better and faster at working on the web. You work 7+ hours a day on the web. Buried in a sea of 100+ tabs and 10+ web-apps 🤯, you constantly lose context for why you did what you did, and are always one click away from being distracted. We took apart the browser for you, and rebuilt a new experience from the ground-up, for the FASTEST and most PRODUCTIVE work. ⚡

YC S25
SigmanticAI logo

SigmanticAI

The Cursor for Chip Design - Delivering Silicon-Ready Chip Designs…

SigmanticAI is building an AI-native hardware development assistant that automates the entire RTL design flow, from natural language to synthesizable HDL and testbenches, inside a seamless VSCode fork. Powered by fine-tuned Verilog LLMs, reinforcement learning, and real compiler feedback, SigmanticAI iteratively refines code until it compiles and passes synthesis, no matter how complex the design. It’s like the Cursor for HDL design. In addition to code generation, SigmanticAI can generate token-level annotations and onboarding documents to accelerate ramp-up for new engineers. With support for both cloud and on-prem deployment, it integrates with existing EDA tools to dramatically reduce debug time, improve collaboration, and accelerate hardware design across teams

YC W20
Signadot logo

Signadot

Shift Left Testing for Microservices

Signadot is a Kubernetes-native platform that accelerates the development of microservices based applications. Using Signadot developers test and preview their code changes early in the development lifecycle and iterate 10x faster.

YC S22
Signatur Biosciences logo

Signatur Biosciences

Simple tests for complex diseases.

We make precision diagnostics more accessible, starting with breast cancer prognosis. Current tests that guide the use of therapy are really slow and expensive because they need to be run in complex centralized facilities. Our tests are designed to be easily run by local hospital labs, reducing turnaround time from over three weeks to a few days and for a fraction of the price.

YC S23
Silimate logo

Silimate

The copilot for chip designers

Silimate is the copilot for chip designers; it finds and fixes functional and PPA issues in your chip designs. Today, chip teams spend most of their 12-18 month design cycles converging slowly to functional correctness and their targeted PPA (power/performance/area). With Silimate, chip designers create correct, PPA-converged RTL code in minutes and eliminate months from their tape out schedule.

YC S22
SilkChart logo

SilkChart

AI Sales Assistant to increase playbook adoption and win more deals

SilkChart analyzes sales calls and measures how well playbooks are executed. It proactively surfaces coaching opportunities to managers, and provides reps with actionable feedback to close more deals.

YC W24
Silogy logo

Silogy

An AI-powered test and debug platform for chip developers

Silogy is building an AI-powered platform for chip developers to simulate and debug their designs.

YC S24
Silurian logo

Silurian

Foundation models to simulate Earth, starting with weather.

Silurian is building foundation models for simulating Earth, starting with weather. From assessing the risk of wildfires to predicting the energy grid load, we provide an infrastructure layer for our planet. Our frontier models push the boundaries of what can be simulated on Earth and improve decision making across vital sectors including energy, insurance, agriculture, and logistics.

YC W16
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Silver

Low cost consumer device for toxin detection.

At Silver, they are building the world's first miniaturized Raman spectroscope for consumers. Our spectroscope, combined with our proprietary nanoparticle substrates, enables our users to detect many contaminants instantaneously.

YC X25
Sim logo

Sim

Open source platform to build AI agent workflows

Sim enables fast-growing dev teams to build and deploy AI agent workflows. 65,000+ developers are already using Sim, integrating with 100+ apps to streamline workflows with AI agents.

YC S24
SimCare logo

SimCare

AI avatars to scale healthcare training.

SimCare is an all in one solution for training clinical skills in healthcare and behavioral health. From AI avatars that you can speak with, feedback systems trusted by the top programs in the country, to site placements tools that help you show your skills and find a job. SimCare is used across the board to train counselors, social workers, doctors and nurses.

YC S23
Simbie AI logo

Simbie AI

Clinically-intelligent AI Voice Agents for Healthcare

YC W18
Simetrik logo

Simetrik

No code enterprise SaaS for financial control automation.

No code enterprise SaaS for financial control automation. Empowering finops and accounting teams with a no code platform that allows them to automate and maintain financial control automation throughout the finops process.

YC W19
Simmer logo

Simmer

We do reviews for dishes. Our app helps users find the very best…

Today’s delivery apps are bad experiences. First, you have to choose a delivery platform. Then, you scroll through dozens of restaurant and finally, you decide between hundreds of dishes. And even if you choose the right restaurant, you might get the wrong dishes. On Simmer, we tell you the best reviewed dishes across all delivery apps. You first choose your dish on Simmer, and the delivery companies just take care of logistics. Through this, we are able to charge affiliate revenue for every order. No one has done this before because determining a city’s best dishes requires millions of users to leave dish reviews. Our unique insight is that all the data required already exists online, in blog posts, social media, newspapers. It just needs to be aggregated, analyzed, and indexed. We have built a custom sentiment analyzer to do just that. Our vision is to be the first place people go when ordering delivery. The founders have backgrounds in engineering and data science from UChicago (their alma mater) and they have both worked at food tech companies like Lolli and Pops and Blue Apron.

YC S05
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Simmery

YC S10
S

Simperium

Simplenote (simplenote.com) and the Simperium platform for syncing…

Simperium is a Y Combinator-funded company that builds a platform for syncing content among people and their devices. They released Simplenote as a showcase of this platform.

YC S24
Simple AI logo

Simple AI

AI phone agents for enterprise

Simple AI makes it easy to build and deploy enterprise-grade phone agents in days, not weeks. Iconic businesses use us for sales calls, customer support, leads qualification, and more.

YC W20
Simple Strips logo

Simple Strips

Low-cost blood glucose test strips scanned with a smartphone camera…