Sqreen is the application security platform for the modern enterprise. More than 800 organizations trust Sqreen to protect, observe and test their applications, APIs and microservices. As opposed to pattern-based approaches, Sqreen analyses in-app execution in real time to deliver more robust security without compromising performance.

Squad adds screen sharing to video chats so you can use any app with friends

Squire is a booking and payment platform that connects people with great barbers worldwide. Squire makes it easy to discover and book the best barbers wherever you are, in just a few taps. Squire is also the premier management platform for barbershops. Using Squire, barbers are able to engage their customers, process bookings and payments and better market their business through Squire’s “barbershop discovery” capabilities. Fully integrated with a point of sale, inventory management and payroll systems, Squire is a one-stop solution for barbershop owners to efficiently operate their business. With headquarters in New York and a presence in major cities in the United States, United Kingdom, Australia, and Canada, Squire has quickly become a market leader in technology solutions for the barbershop industry worldwide. For more information, please visit getsquire.com or download the Squire iOS app from the App Store.

Squire is a devtool that works with you by writing pull request descriptions, reviewing PRs, and writing code to implement code review feedback.

📬 Stable is a virtual address & mailroom for startups, and the only solution on the market that guides you through switching your business address compliantly - 🏢 1 permanent business address for all of your company documents and mail - 👩‍🏫 Guidance on compliantly switching your address with the IRS, state, banks, payroll, etc - 📨 Open, view, forward, and shred your mail securely without physically entering a mailroom - ⚡ Integrations with the tools you love to use (Slack, Dropbox, Drive, etc) - 💻 Modern platform with encrypted file storage, optical character recognition, and more

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.

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

With Stack AI, 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 Stack AI to build knowledge-based AI assistants, fill out RFPs and questionnaires, automate content QA, conduct due diligence research, and extract data from documents.

StackLead automatically analyzes sales leads. Starting with only an email address, we pull together all the research a sales rep needs to understand a lead and their business. With this information, sales teams close more deals because they can effectively tailor their messaging and they don't have to spend time manually researching every new lead. You can access StackLead research wherever you need it. If you already have an internal email when a user signs up, you can forward it to StackLead and we'll reply with a complete research report. We also provide a Salesforce integration (stacklead.com/blog/qualifying-leads-in-salesforce-with-stacklead/) and webhooks API (stacklead.com/docs). Get started at stacklead.com or contact us at team@stacklead.com

Stack Machine is a developer tools company based in San Francisco, CA since May 2013. We enable a full-stack understanding of an organizations's codebases and developer environments. Our founders have years of experience running large-scale web services.

We let you create applications for your team, your partners or your customers, powered by the data you're already using. Connect in your spreadsheets, Airtable or database and we'll automatically create an app for you.

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.

Stacksi helps companies automate the process of answering enterprise security questionnaires so they can close deals faster and save their best engineers’ time for more strategic projects. Salespeople, CTOs, and CEOs of fast-growing enterprise startups can upload security questionnaires into our system. If the company already has written security policies, they can upload those documents, too. From there, Stacksi parses their documents, identifies gaps in their security policies vs. standards, and helps them establish a successful security program. Ultimately, we will help them 1) automate completion of security questionnaires, 2) quickly get through enterprise security audits and 3) improve their security posture.

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.

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.

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

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.

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.

Standard Cognition is an artificial intelligence platform that allows buyers to grab what they want without having to go to a cashier.

We are multiplying the potential of the real world by making computer vision accessible to all. We create the cloud and edge tools that developers and non-developers require in order to build, deploy, and improve CV solutions quickly. standardcyborg.com (YC W15)

Standard Treasury helped banks harness the power of developers and developer ecosystems by building, hosting, maintaining, and supporting white-labeled and co-branded developer platforms for banks worldwide. Standard Treasury partner banks saw material top-line growth through the decreased cost of servicing their customers, decreased churn, and increased transaction volumes, while delivering tremendous value to their customers by allowing them to radically automate their treasury management and accounting processes.

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.

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.

Starcity was one of the largest co-living brands. Exit to Common in 2021.