Y Combinator Winter 2021 (W21) Companies

Simplify is a job search platform that helps candidates discover relevant positions, auto-fill applications, and access transparent salary and company culture data. It serves job seekers across all backgrounds and experience levels, positioning itself as a candidate-first alternative to traditional job boards.

2 investors

Sivo enables fintechs and platforms to access affordable credit by financing and trading predictable payment streams from real-world cash flows such as gig economy payouts, digital commerce transactions, invoices, and subscriptions.

5 investors

SlashAuth provides a platform for web3 applications that offers authentication, role-based permissions management, and data persistence capabilities.

1 investor

Smartcuts is a Chrome extension that automatically converts user actions like clicks and typing into replayable automations. The tool targets users who want to automate repetitive browser tasks.

1 investor

Solo provides software tools to help debtors respond to debt collection lawsuits and negotiate settlements outside of court. The company operates a document generation tool for legal responses and an AI-powered negotiation platform connecting consumers with debt collectors.

7 investors

Somos provides home internet and television services to consumers in Colombia, offering over 100 live channels and TV Box devices with a proprietary app.

3 investors

Soraban provides AI-powered software to automate tax preparation workflows for accounting firms, eliminating manual document chasing and administrative bottlenecks during tax season. The platform helps accountants and their support staff reduce manual effort and process work more efficiently.

4 investors

Spline is a web-based collaborative design platform for creating and shipping production-ready interactive 2D and 3D experiences to web, iOS, and Android. It serves design teams and enterprises seeking to build interactive digital products with real-time collaboration capabilities.

7 investors

Spokn is a short-form video platform for internal communications, HR, and leadership teams to create and share videos for employee engagement, including leadership updates, onboarding, and change management. The platform enables companies to produce high-quality video content without traditional video production complexity.

4 investors

SpruceID provides digital identity systems for governments and regulated industries, enabling secure verification and authentication across legacy and modern infrastructure. The company specializes in integrating identity solutions with existing workflows, using open standards to ensure interoperability and long-term flexibility.

9 investors

Drata provides AI-powered governance, risk, and compliance (GRC) automation for enterprises. The platform uses autonomous agents to discover and govern AI agents, automate evidence collection, manage vendor risk, and generate continuous audit-ready proof of security posture.

1 investor

Stayflexi provides software that handles operations for hotels and vacation rentals, with features for automating management tasks and selling unused rooms and amenities to increase revenue.

2 investors

Stoke Space develops fully reusable rockets for space transportation and mobility services. The company focuses on rapid iteration from prototype to launch, with a mission to enable seamless mobility to, through, and from space.

27 investors

Striga provides regulated APIs for digital asset custody, trading, banking, and card issuing across 30+ countries, serving fintech platforms, neobanks, and payment service providers that want to offer crypto and fiat services without holding their own licenses.

4 investors

Javelin Robotics builds AI workers for physical industries, targeting companies operating trucks, managing logistics loads, and handling shipments.

1 investor

Svix provides a webhooks-as-a-service platform that enables companies to send webhooks reliably and at scale. It serves developers and API teams across all company sizes looking to integrate real-time data infrastructure into their applications.

5 investors

Swadesiway is an e-commerce marketplace selling products priced in Indian Rupees, with a focus on best-selling items across multiple price ranges.

1 investor

SwiftSku provides a mobile app and hardware solution that automates pricebook management and point-of-sale integration for independent convenience stores, enabling real-time sales monitoring, customer loyalty programs, and business analytics.

3 investors

Taloflow provides technology research and evaluation services for consulting firms and enterprises, delivering client-ready reports to support informed technology purchasing decisions.

3 investors

TaoFi provides financial infrastructure that enables transactions and payments within decentralized artificial intelligence systems and applications.

2 investors

Taste operates a marketplace where customers can purchase prepared meals from restaurants and have them delivered nationwide, providing an alternative to home cooking or conventional takeout for at-home dining.

1 investor

TechBiz provides a mobile application for small and medium enterprises in India to monitor key business metrics like receivables, payables, and sales from data that would otherwise be locked in traditional accounting systems.

1 investor

Terapify is an online mental health platform that connects users with licensed psychologists for individual and couple therapy sessions, along with supplementary wellness content such as yoga classes and guided meditations. The service operates across Latin America and serves Spanish-speaking users seeking accessible virtual mental health care.

2 investors

Terra is an API platform that enables apps and developers in fitness, wellness, sleep, and health spaces to connect with wearable devices. The company facilitates real-time data integration from wearables to power personalized consumer experiences.

7 investors