Nov 17, 2025 01:38:37 PM

Companies


Showing 4251-4275 of 5661 companies
YC W22
Sendo logo

Sendo

The best SMS/RCS API for startups

We're making it easy, cheap and fun for startups to build on SMS again. Sendo is the most developer-friendly SMS API, with great documentation, a fast dashboard, helpful monitoring features, easier 10DLC compliance and much more. Save 40%+ compared to Twilio and other options, and get started sending messages in 1-2 days instead of waiting weeks for your 10DLC campaigns to get approved.

YC W11
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Sendoid

High speed peer to peer data transport technology for consumers…

Sendoid is an on-demand peer to peer transfer system. It makes transferring any size file between two people as simple as clicking a link!

YC W12
Sendwave logo

Sendwave

Instant, no fee international remittances.

Sendwave's mission is to make sending money as easy and affordable as sending a text. Our app sends transfers securely from North America and Europe to Africa, Asia, and the Americas at great rates.

YC S16
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Seneca Systems

Constituent system-of-record and service request management software…

Every day, incredible government workers serve the public without the resources—and appreciation—their important work deserves. These hard-working teams have to deal with communications arriving from too many channels, maze-like processes for fulfilling constituent requests, and a dangerous lack of visibility into constituent opinions on major issues and the work teams perform. Software can help! But the vendor community has responded with hard-to-use, hard-to-implement, and hard-to-purchase private sector software rather than building something from the ground up. These outdated solutions fail to address government workers’ unique challenges. Seneca Systems was founded to address those challenges and strengthen the vital bond between government and people. Our Constituent Services Platform, Romulus, centralizes constituent communications, organizes service requests, and provides insights into constituent preferences and work performed. Built for governments by people who love government workers, Romulus enables government workers to get more done in less time, with less overhead, and to more constituent applause.

YC S13
Senic logo

Senic

Simple Controls for Sonos, Philips Hue and other Smart Home products

Our mission is to empower every family member and business to set the right ambience of sound and light for every moment. Our company offers simple wireless switches and remotes for products like Sonos or Philips Hue, software and simplify the installation of Smart Home systems and add-on solutions to create a great smart home experience for consumers, prosumers and professionals.

YC W25
Sennu AI logo

Sennu AI

Hands off Salesforce QA

Sennu's AI agents automate Salesforce functional testing. Just connect your user stories and we'll take care of the rest.

YC S21
SenpAI.GG logo

SenpAI.GG

Personal gaming coach for PC gamers globally

SenpAI.gg is a gaming coach for the 1.4 billion PC gamers globally. SenpAI.gg’s desktop application makes personalized recommendations in the game and provides post-game feedback to help gamers improve faster. It is the most comprehensive assistant that supports gamers before and during the game via Voice Assistant, or an overlay that uses computer vision. The company is Boston-based and founded by Olcay Yilmazcoban (MIT researcher & gamer) and Berk Ozer (engineer & gamer). We raised $3M seed funding (ACT Venture Partners) and we are in the Summer 2021 Batch of Y Combinator. https://senpai.gg/

YC S24
Sensei logo

Sensei

Robotic Training Data at Scale

Sensei helps robotics companies scale and outsource their training data collection. Our hardware platform enables the collection of human-demonstration data at a tenth of the cost and twice the speed of current teleop approaches. Our software platform acts like Scale AI for robotics data: a large network of paid human operators use our low-cost collection platform to fulfill data-generation requests.

YC S21
Sensible Biotechnologies logo

Sensible Biotechnologies

Unlocking the next generation of mRNA medicines

The future of mRNA therapeutics is hampered by manufacturing challenges and unless solved, its exciting potential may never be realised. Sensible enables the next generation of mRNA medicines by turning living cells into factories producing abundant, highly stable and non-immunogenic mRNA in a scalable and cost-effective way.

YC W24
Senso logo

Senso

AI-Powered Knowledge Base for Customer Support

Senso is building an AI-powered knowledge base for customer support, starting in the Credit Union space. Our product reduces contact time by over 10x by enabling support teams to make decisions about customer requests in seconds. Bringing service automation to the financial services industry is a $6B opportunity, and we’re building for all regulated industries where Senso's founders have spent over a decade building enterprise software.

YC W23
SensorSurf logo

SensorSurf

Resolve PR check failures instantly with AI

Technician helps you get your pull requests merged faster. We do this by listening to your check run logs for failures and provide suggested changes that you can instantly commit to your branch.

YC S21
Sentiyen logo

Sentiyen

Conversational AI assistants using your knowledge

At Sentiyen, we build GPT-based AI assistants that are trained on your content and enable your audience to get the answers they need 24 hours a day. We allow creators and businesses scale themselves to unlimited 1:1 conversations with potential customers, which helps increase revenue, reduce spend, and improve customer satisfaction.

YC S24
Sepal AI logo

Sepal AI

Data Development for Advanced AI

Sepal is a data research company on a mission to advance human knowledge and capabilities through safe AI. We partner with the world’s leading AI labs and enterprises to help their models get better at the tasks people actually want them to do. We’ve built a Cloud-Native Agent Dataset Factory which turns the process of generating evaluation and training data from manual, inconsistent, and labor-intensive into something automated, standardized, and scalable. Sepal AI was founded in 2024 by engineers and operators from Vercel and Turing. We went through Y Combinator, raised several million dollars from leading investors, and already count multiple Fortune 500s and top AI research labs as paying customers.

YC W18
Sepsis Scout logo

Sepsis Scout

Wearables and AI to predict and prevent sepsis outside the hospital

Formerly known as Patchd Medical, now acquired by Cytovale. Wearable technology and AI to predict and prevent sepsis outside of hospital.

YC S19
Sequence Bio logo

Sequence Bio

Discovering the true signals of disease to power life-changing drugs.

90% of drug candidates fail, delaying help for those in need. We’re on a mission to change that. Better drug target discovery powered by the Newfoundland founder effect.

YC S21
Sequin logo

Sequin

Sequin is building AI Voice Agents to automate collections calls for…

Sequin AI is building compliance-first AI voice agents to automate human agent intensive collections calls for consumer lenders and servicers. CEO and Co-founder Vrinda Gupta, former Visa product leader who built the Chase Sapphire Reserve credit card and ran audits for top 10 issuers, teamed up with CTO and Co-founder Mark Thomas, former PayPal engineering leader, to bring world-class technology to consumer lending and servicing. Backed by Y Combinator, Sequin AI has raised $5.7M from top investors, including executives at OpenAI, the Schwab family, and leading venture funds like Matrix, Commerce Ventures, and Thomvest - the same firms behind some of the most iconic technology companies of our time. Reach out vrinda@sequinai.com to learn if Sequin's AI Voice Agents can dramatically reduce your cost of collections today.

YC S25
Serafis logo

Serafis

The AI knowledge graph for institutional investors

Serafis is a search and discovery engine for long-form content. Our AI knowledge graph turns under-indexed data into structured market intelligence — starting with podcasts. We help investors and operators: • Accelerate research • Surface new insights • Distill signal from noise We are already live with 12 organizations managing over $70B in capital. Our library features >10,000 curated transcripts featuring top investors, Series A+ founders, and public company CEOs — searchable by person, company or theme.

YC W23
Serial logo

Serial

Root cause manufacturing issues in seconds

Serial is software to help manufacturers root cause problems in minutes not days and avoid millions in liabilities. Our solution integrates with data sources from any production line, enabling engineering & operations teams to ask questions about their manufacturing data and instantly get answers. Serial will become the single source of truth for manufacturing data. Our founding team has 10+ years of manufacturing and product design experience from Apple, Tesla, and more. We have suffered this problem firsthand and are building the tool to fix it.

YC S15
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Serica

Financial payment and loan services for the Medical Cannabis and…

For the first time in history, Serica enables asset rights to be traded & stored on the Bitcoin blockchain by anyone, anywhere. Serica is a commodities trading platform which connects investors to bitcoin-linked asset rights such as gold, silver, platinum & palladium assets tradeable on multiple digital money & precious metal exchanges. Customers, anywhere in the world, can purchase commodities from Serica's dealer partners. Serica's decentralized custodian service publicly manage assets under custody, allowing safe & low-cost storage of valuable hard assets. Customers leverage DigitalTangible centralized & decentralized trading partner platforms to trade their asset-receipts for bitcoin or other digital money. Precious metal bullion may also be rapidly liquidated for cash or bitcoins.

YC W22
Serif Health logo

Serif Health

Healthcare Price Transparency APIs and Data Products

At Serif Health, we are taking the complexity out of the cost of healthcare. Our mission is to make healthcare pricing and contracting more transparent, easier to understand, fairer, and ultimately more affordable for all. New price transparency regulations have made a wealth of healthcare pricing and reimbursement data publicly available for the first time, but it is still extremely hard to ingest, organize, and actually use this data to understand the cost of care. That’s where we come in. Serif Health is building healthcare price intelligence data products and APIs to power the future of more transparent healthcare. We are an early-stage, venture-backed startup with a small, collaborative team of healthcare experts, engineers, and designers. We are excited to add new team members motivated by our mission, passionate about making a difference in healthcare, and looking forward to learning and growing from the challenges we will face along the way!

YC S22
Serinus Biosciences logo

Serinus Biosciences

Combinations therapy by rational design

Serinus Biosciences is tackling one of the toughest problems in cancer treatment: creating combination therapies to override treatment resistance. We leverage cutting edge technology to design a fully explainable AI platform primed with decades of system biology knowledge. Uniquely powered for biological inference, our AI engine uncovers how cancer cells evolve treatment resistance and identifies molecules to overcome resistance escape routes. We design combinations that are safer, more effective, and can get to patients quickly. Founded by MIT PhDs and supported by a scientific advisory board of top academics from the Broad Institute, Dana-Farber, and UCSD, Serinus is powered by Y Combinator and other top investors to revolutionize precision medicine.

YC W21
Serna Bio logo

Serna Bio

Genetic Medicine with Small Molecules

Serna Bio is developing small molecules to modulate RNA function, unlocking the potential to treat diseases driven by biology intractable by other modalities.

YC W22
Sero logo

Sero

Customer onboarding built for B2B SaaS

YC S23
Serra logo

Serra

Your 24/7 AI Recruiter

Serra is an AI recruiter that fully automates candidate sourcing and outreach, finding ideal talent from LinkedIn, GitHub, Crunchbase, and your ATS. Companies hiring Serra skip sourcing entirely and simply get qualified interviews on their calendar.

YC S15
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Seva Coffee

We're changing the world of coffee, one personalized cup at a time.

Seva Coffee is a consumer electronics company based out of Calle Laguna del Marquesado Nª 19, Nave 16 Edificio Adriana 1ª Planta, Polígono Industrial La Resina (Villaverde), Madrid, Community of Madrid, Spain.