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Speechly makes it cost efficient to understand human conversations, in real-time. We do this by enabling high-accuracy spoken language understanding processed right on the end user’s device. Hundreds of millions of hours of audio data are generated every single day online. Speechly is the first solution that can affordably turn this audio into actionable insights.
Helsinki, Finland1-50 employees
Speedy Labs helps manufacturers and distributors ditch error-prone spreadsheets that cost them millions in missed rebate opportunities for an AI-powered solution that not only tracks rebate payments and their performance but also unlocks insights from their financial data silos that uplifts their bottom-line profit margins. $1 trillion worth of rebates are exchanged every year in North America alone.
Remote1-50 employees
Sphere is an AI-powered cross-border compliance platform. We help companies like Lovable, Eleven Labs, Replit and Windsurf automate their sales tax, VAT, GST compliance obligations. What makes us different to other vendors on the market is: 1. we have spent the last 1.5 years building local rails into 100+ tax authorities in both the US and internationally to properly automate compliance processes, and 2. we've built the world's first AI-native tax engine which ingests, codifies and monitors tax law globally.
San Francisco, CA, USA1-50 employees
Spherecast is building Agnes, the AI Supply Chain Manager for Consumer Goods. Agnes decides what to produce, where to make it, and how to move it through factories, warehouses, and channels – simulating thousands of options in seconds and executing the best plan. We are building Agnes to shape the physical flow of goods in the world, turning it into something as programmable as code. When we succeed, every consumer product you touch will run on the Spherecast stack – planned in the Spherecast OS, executed over Spherecast Rails, and optimized by the shared Spherecast Network. Oracle turned atoms into bits. Spherecast turns bits back to atoms, but globally optimized. Be part of the next $T company.
1-50 employees
Sphinx automates the manual work of compliance analysts. Our AI agents make AML decisions, helping banks and fintech eliminate onboarding bottlenecks.
1-50 employees
Backed by Y Combinator, Zoom and Atlassian, Spinach AI is the system of action for conversation data. Industry leaders like Abnormal AI and eToro use Spinach to capture and transform raw conversations into structured knowledge that powers people, agents, and LLMs across the enterprise, driving productivity for workers and strategic insight for leaders.
Nashville, TN, USA; Remote1-50 employees
Spine AI is a visual workspace where a single prompt spins up a swarm of AI agents that plan, delegate, and execute complex tasks together — with humans fully in the loop. Instead of chatting back and forth with one model, Spine breaks work into visible steps on a shared canvas. Agents collaborate in parallel, ask clarifying questions, use connected tools, and show their reasoning and intermediate outputs as they work. Every agent’s work stays inspectable, auditable, and editable — reducing hallucinations and giving you real control over the outcome. Spine connects to leading AI models and your existing tools, but the real power comes from orchestration: you act as the team lead, Spine runs the swarm. Chat is great for answers. Spine is built for execution.
San Francisco, CA, USA1-50 employees
Splash is developing the next generation of autonomous surface vessels (ASVs) to provide National Security and defend critical assets such as oil rigs and shipping terminals. Our long-term vision is to make traditional naval vessels obsolete by creating a fleet of low-cost and versatile boats which will be able to dominate the seas. Our expertise in mass manufacturing, engineering and quickly scaling operations will make this vision a reality.
El Segundo, CA, USA1-50 employees
Splendor's AI agent helps providers, EHRs, and billing companies automate benefits checks, prior auth, and more.
Cambridge, MA, USA; Remote1-50 employees
Sponge is the easiest way for agents to hold and spend money, and for businesses to sell directly to them. For agents: Sponge lets agents hold funds and transact autonomously with other agents and businesses using bank accounts, cards, and crypto. Agents can autonomously purchase services such as email, browser use, and premium data without human involvement. For businesses: Sponge makes it easy to onboard and accept payments from agents without human interaction. Businesses can sell their services directly to agents with a few clicks, no code changes required.
1-50 employees
Spot is building the infrastructure to support the future of at-home diagnostics. Our fully white-labeled platform helps brands offer lab-analyzed diagnostic tests using at-home collection kits. Companies simply order tests via our API, and we handle the rest—the collection kits, the logistics, physician authorization, and the lab integrations.
Cincinnati, OH, USA1-50 employees
SpotPay is a global borderless neobank. We give users one account that works for everything payments related: receiving money from abroad, paying locally, spending anywhere with the SpotPay card and saving and earning on their balance.
San Francisco, CA, USA1-50 employees
We are a full-service sell-side residential brokerage that lists and markets your properties. We also screen and schedule tenants showings with our AI agent for a third of the normal commission.
New York, NY, USA1-50 employees
Spott is the first AI-native ATS/CRM for recruiting & staffing firms. We built Spott because existing recruitment platforms require extensive manual work, are clunky to use, rely on fragmented add-ons, and are not designed for AI adoption. Spott combines everything recruiting firms need, from a full ATS & CRM to AI agents across the entire workflow, into one AI-native solution. It enables recruiters to focus on what matters most and close more placements.
1-50 employees
Sprites AI automates customer acquisition for entrepreneurs. Our AI agent handles managing SEO, running paid ad campaigns, content marketing, influencer outreach—tasks that normally require hiring multiple people or agencies. Entrepreneurs using our platform acquire customers much faster and scale their growth funnel without the overhead of building marketing teams or hiring expensive agencies. The result: SMBs and solo founders can now scale revenue like they have a full marketing department. We're arming entrepreneurs and small businesses globally with systematic customer acquisition run by AI- so they can focus on the important things that make their offering unique.
San Francisco, CA, USA1-50 employees
Never code up another test or hire an external QA team. We handle and automate all functional and E2E testing.
San Francisco, CA, USA1-50 employees
We believe the electricity grid is the most important machine on Earth. If we want electrification to move fast, the teams planning and operating networks need software that is as modern as the challenge. Our thesis is simple. Better decisions come from one unified, trusted network model. When everyone works from the same model, planning becomes consistent, assumptions are visible, and progress stops getting lost in spreadsheets and static reports. Squid is AI powered grid planning in your browser. We have spent years inside National Grid, Octopus Energy, and AWS, building and learning what breaks. Now we are building what we wished existed.
1-50 employees
Stably AI auto-writes, runs, and maintains end-to-end tests directly in your CI, guarding every pull‑request and production release—no flakiness, no test maintenance. Hundreds of modern engineering orgs already use Stably to merge code in minutes, replace brittle Playwright/Cypress suites, and slash QA spend by up to 80%. Stably offers - AI-generated test flows that mirror real user journeys. - Diff-aware execution—only tests affected by your change run, so CI stays under five minutes. - Automatic selector & assertion healing when your UI shifts, keeping the suite green. - Plain‑English editor letting PMs and QAs add tests without writing code. - One‑click GitHub App or API for instant pipeline integration.
San Francisco, CA, USA1-50 employees
Stack is the open-source authN, authZ, and user management platform. We build for devs who want to iterate quickly, offering both managed auth and self-hosting. You can set it up in one minute and scale with the project as it grows. Stack was built by repeat founders with strong technical backgrounds. Check out our GitHub: https://github.com/stack-auth/stack
1-50 employees
With StackAI, any organization can deploy custom AI agents to automate its back-office operations. Our low-code interface allows teams of all levels of expertise to build internal tools. Hundreds of companies use StackAI to build knowledge-based AI assistants, fill out RFPs and questionnaires, automate content QA, conduct due diligence research, and extract data from documents.
San Francisco, CA, USA51-200 employees
Stackshine is creating mission control for enterprise IT teams. We discover all the software being used across their organization and then automate workflows related to onboarding/offboarding, cost savings, and security.
Portland, OR, USA; Providence, RI, USA; Remote1-50 employees
Stacksync powers real-time and bidirectional data synchronization between CRMs (e.g. Salesforce, Hubspot or SAP) and databases (e.g. Postgres, Google BigQuery,...). Edits made in your CRM will instantly update in your Database, and vice-versa. To set up a sync, users simply have to connect the two chosen apps in one click and select the tables they want to sync, no-code! Stacksync reduces implementation delays from months to minutes for CRM integration projects and removes all the complexity behind CRM new feature development. We show a 90% improvement on delivery time and budget.
San Francisco, CA, USA1-50 employees
Stackup is transforming how businesses manage their on-chain operations by offering a smart account platform designed to simplify and automate complex blockchain tasks. As the need for seamless, secure, and efficient crypto transactions grows, Stackup provides centralized control over decentralized assets, allowing businesses to take charge of every detail of their operations with ease. Our platform integrates advanced security and adaptive features to eliminate the chaos of traditional crypto wallets, empowering businesses to manage their crypto stack in real-time. Whether you’re orchestrating large-scale transactions or ensuring complete transparency, Stackup’s solution brings order and precision to blockchain management—turning crypto chaos into structured, seamless business flow.
Los Angeles, CA, USA; Remote1-50 employees
StafBook help SMEs to simplify HR & expense management. With StafBook, business managers can manage the People administration starting from HR (onboarding, leave & attendance, payroll, until off-boarding) and also expense management (reimbursement, cash advance). Thus, people can save their time on administrative task, and focus on core business
Jakarta, Jakarta, Indonesia1-50 employees
Stairs helps young Americans buy their first home. Our home search identifies homes based on their finances, and connects them to government grants, loans and tax breaks.
New York, NY, USA
Stamp is the first AI Native inbox. It's more than an email client, though -- it's like your second brain. Stamp can respond to emails in your voice, organize your inbox to filter out the noise, keep track of action items, and automate essentially every task you're doing manually in your inbox today.
1-50 employees
Star makes game development accessible to anyone with an idea. Using AI, you can create complex, playable games without writing code - just describe what you want and iterate. We're building the future of creative tools for the next generation of game makers.
Monterey, CA, USA; Remote1-50 employees
Starjar automates inbound document processing workflows for hospitals. These inbound documents include patient referrals, claim files, audit files, medical images and more. We work with many of the top healthcare systems and hospitals in the US and automate millions of inbound documents for them every year.
1-50 employees
StarSling is building an agentic developer homepage that automates all the tasks that eat up a developer’s time after they’ve left their code editor: deployments, performance, incidents, and bugs. Open your homepage, click on a GitHub, Linear, or Sentry issue and you’ll see an Autofix button that triggers an AI agent and opens up a Pull Request with a fix, all without leaving your homepage.
San Francisco, CA, USA1-50 employees
Starcloud is building data centers in space, initially to provide GPU compute to other satellites, and later to address the rapidly growing demand for energy caused by the deployment of AI. Falling launch costs give Starcloud access to abundant energy, radiative cooling, and the ability to rapidly scale in space. In November 2025, just 21 months after founding, Starcloud launched its first satellite, Starcloud-1 to space. This has an Nvidia H100, which is 100x more powerful GPU than has ever been operated in space before. With this, they became the first entity to train an LLM in space and the first to run a version of Gemini in space. Starcloud will soon also run high-powered inference on Capella SAR data on orbit for the first time. Starcloud is launching its second satellite in October 2026, which will have 100x the power generation of the first and generate more cash than it costs to build and launch. Starcloud expects that within 10 years, most new data centers will be being built in space for the energy.
Redmond, WA, USA1-50 employees
Stardrift is AI travel search for frequent flyers, helping you plan and book complex itineraries. Users use us to find the flights that work for their schedules and preferences.
San Francisco, CA, USA1-50 employees
Starling is building a urine diagnostic remote patient monitoring platform that seamlessly integrates into anyone's bathroom routine. By detecting early changes in a patient's urine using our toilet indwelling mass spectroscopy device, our platform is aiming to prevent hospitalizations from numerous conditions like recurrent UTIs, BPH exacerbations, or diabetes. We do this while creating significant new annual revenues for our clinician partners from remote patient monitoring reimbursements without requiring any significant changes in a staff's day to day schedule.
Houston, TX, USA1-50 employees
Status allows users to live in immersive fantasy worlds through the familiar lens of social media.
New York, NY, USA1-50 employees
Steinmetz is an electric vehicle platform company based in San Francisco. We use new power electronics techniques to significantly improve power densities (kW/kg, kW/L) bringing down vehicle system costs and even unit costs. Our first products are Inverters/motor controllers with industry-leading power densities while remaining cost competitive.
San Francisco, CA, USA1-50 employees
A fool-proof goals platform using GPT to help teams write and track SMART goals at every level. Automates manual, redundant tasks that take time away from team’s high-impact contributions.
San Francisco, CA, USA1-50 employees
25 million Americans with chronic insomnia are getting inadequate and superficial care advice (e.g. cutting coffee, meditation etc.), when in reality, their sleep problems are often driven by deeper psychological challenges like unresolved anxiety. Stellar Sleep uses psychology to help these people break the insomnia cycle.
1-50 employees
Stellon Labs is an AI research lab that is building tiny frontier AI models that can run on edge devices like smartphones, wearables and embedded systems. Our first open source model, KittenTTS, is a super-tiny text-to-speech model, that got 8K Github stars and 45K model downloads within 2 weeks of launching.
San Francisco, CA, USA1-50 employees
You can think of Stempad as a Notion for science. It is the world's first true pen-and-paper alternative to fast scientific writing and collaborating. Quickly switch between different forms of technical visualization with the ease of a whiteboard and the convenience of your keyboard. Stempad allows you to share your work, collaborate in real time, store your data, annotate, write papers, plan, takes notes, create presentations, and so much more. Our vision is to make it easier and faster for students and scientists to digitize and share their scientific ideas.
1-50 employees
currently in stealth Reach out to us at founders@focusbuddy.ai Our previous product - Focus buddy is an AI productivity coach that stays on calls with you and help you accomplish your important work goals on a daily basis, even when you are struggling to focus. We noticed that our users develop a productive relationship with Focus Buddy. Users stay on calls for multiple hours everyday where they depend on Focus Buddy to: • Avoid procrastination and get started: Address hidden anxieties, embrace imperfection, chunk tasks, kickstart with mini-goals, and use regular check-ins to maintain momentum. • Recover from distractions and stay focused: Focus Buddy detects when they are working on less important tasks or scrolling on social media, help them overcome the underlying concerns feeding the distraction, and help them get back to the important task • Manage stress and Prevent Burnout: Focus Buddy detects stress buildup, integrates mindfulness habits to the workflow, helps take short rejuvenating breaks, and stay composed. Our Initial ICP is people with ADHD who are highly motivated but also highly blocked by internal and environmental factors. In the future, we believe each worker should have their own personal coach that enforces proven productivity techniques in real time to help them extract more focused hours every day with the same effort.
San Francisco, CA, USA1-50 employees
Stewdio is a collaborative platform for creative teams to use all the latest image + video generation models in one place. Music video directors, ad agencies, and architects use Stewdio to create everything from rap videos for Quavo and Loco, advertising storyboards, to architectural renderings.
New York, NY, USA1-50 employees
Our first product, Stillwind Search, makes finding an electronic part as easy as writing a text message. The search engine turns natural language queries into fine-grained specifications that are matched against our proprietary database of millions of parts. This is the first step towards autonomous electrical engineering.
Zürich, ZH, Switzerland1-50 employees
Stilta is the AI-native software for patent attorneys, built on agentic workflows to amplify how IP work is done end-to-end. Instead of spending weeks manually researching and analyzing patents, practitioners can reduce manual work by up to ~60% while unlocking new revenue opportunities. Innovation is key to solving the world’s most important challenges, but the tools to protect innovation haven’t kept up. Patent teams are stuck doing high-stakes work with a process built around manual document review and disconnected point solutions. Existing tools are rigid and fail by not integrating AI with clear traceability (every output must be source-backed, referenced, and auditable). General LLM solutions generate text, but they don’t solve trust and integration in legal-grade workflows. We’re four engineers from McKinsey/QuantumBlack who’ve spent the last few years building and deploying AI for large organizations. Now we are building Stilta because the practitioners protecting the world’s most valuable ideas deserve tools that match the stakes. We’re already live with leading firms in both Europe and the US.
San Francisco, CA, USA1-50 employees
Stock Unlock is an investment education and analysis platform, built by retail investors, for retail investors. We make it easy for noobies to start their investment journey, and save time for the pros. We are building THE place for investors to learn, grow, and invest confidently.
New York, NY, USA; Remote1-50 employees
Stockline is an AI-native ERP for food wholesalers. Our agents eliminate human labor for repetitive tasks, starting with order entry. Our goal is to replace clunky software with the next generation of ERPs, built with AI employees at their core. Team is 2 Polytechnique alums who dropped out of Stanford and MIT. Mariem is daughter of the fish industry and Moncef started coding and building softwares at 13.
San Francisco, CA, USA1-50 employees
With AI increasingly automating away code generation, software engineers will spend more time reading, judging, and architecting code rather than writing it. Storia is building an open-source copilot that knows a company's codebase and its context. We are starting with Sage, a Perplexity-like agent for helping developers understand, judge, and generate software. Given an existing codebase, developers can ask Sage questions such as: 1) Given my project’s SLA and latency constraints, what is the appropriate underlying vector database to use? How would I incorporate it into my existing codebase? 2) Why should I pick Redis over Milvus as my underlying vector store? 3) Does this codebase in our organization still work and what steps are required for a complex integration with another library? Sage’s answers are directly supported by documentation and external references like GitHub, Stack Overflow, technical design documents, and project management software, preventing hallucinations. Today, Sage has up-to-date knowledge about open-source repositories (indexed daily). Tomorrow it will have a deep understanding of every line of code on the Internet. For teams, Sage will know about your private codebase too. No group has yet solved how to build an AI system that comprehends a codebase and its context and can empower every developer to architect better code, faster. This requires new research advances because vanilla RAG and out-of-the-box LLMs aren’t going to cut it. We have 20+ years of software engineering and AI research experience. Julia worked on precursors of Gemini using contextual neural techniques before they were called “RAG” (and applied it to products like Google Keyboard and Pixel phones). Mihail built the earliest LLMs at Amazon Alexa and launched the first contextual deep learning conversational AI system in production at Alexa.
Millbrae, CA, USA1-50 employees
Stormy: AI-Driven Influencer Marketing Streamline influencer outreach and let your product shine. • Discover: AI pinpoints ideal influencers with 99.8% accuracy. • Outreach: Auto-send personalized emails and follow-ups. • Close: AI negotiates and finalizes deals seamlessly. Focus on building—Stormy handles distribution on autopilot. Founders from YC have discount! Please DM me on twitter: @karmedge or email
San Francisco, CA, USA1-50 employees
Storyboarder is a tool and a platform for anyone to create, share, and sell webcomics. In East Asia, the webcomic (or digital manga) industry is an $12B market and rapidly growing to the rest of the world. Webtoon, the largest company in the space, generates $100M / month in revenue. However, their addressable market is limited by their content creators, who need know how to draw. Readers are desperate for a greater variety of stories in webcomics. Through years of working with filmmakers, we’ve built extremely easy to use storyboarding software that has 700K users. We’re democratizing visual storytelling to everyone. We’re working on the next generation that, through advances in video game interfaces, ubiquitous 3D compute, and AI, will allow anyone to easily create scenes, pose characters, to create webcomics. Storyboarder is backed by Y Combinator (W23), David Karp (Tumblr Founder), Andrew Kortina (Venmo Founder), and other product focused investors.
New York, NY, USA; Remote1-50 employees
Strac is an agentless Data Discovery (aka DSPM - Data Security Posture Management), Data Classification & DLP (Data Leak Prevention) that automatically discovers, classifies and remediates sensitive data (alert, label, redact, mask, block, delete). Strac protects SaaS, Cloud, Gen AI, Browsers, On-Prem and Endpoints like O365, Slack, GDrive, AWS, Salesforce, ChatGPT, Jira, Mac, Zendesk, Azure, On-Prem (On-Prem, MS SQL SAP) and 40+ integrations. Strac protects enterprise companies like UiPath, Databricks, thredUP, B Capital, Crypto (dot) com!
Bellevue, WA, USA1-50 employees
Strada helps insurance carriers, MGAs, and brokers run with AI agents that handle sales & service calls, chats, and emails 24/7.
San Francisco, CA, USA1-50 employees
Our planes fly 10 times further than battery electric alternatives, with a lower operating cost than fossil fuel powered aircraft. Our first product is a 15 seat aircraft with a range of 800 km that enters service in 2026 with launch customer Skytrans. Our team has over 85 years of aerospace experience and have developed, flight tested and certified aircraft at Google X, magniX, Heart Aerospace, Ampaire, Airbus, Boeing, Bombardier and Gulfstream. We have $145M in aircraft LOIs from 7 airlines in the US, Europe and Australia.
Brisbane, QLD, Australia1-50 employees