Y Combinator Winter 2021 (W21) Companies

Sleep Reset is a digital sleep clinic offering telehealth-based treatment for insomnia and obstructive sleep apnea using cognitive behavioral therapy and at-home diagnostics. The platform connects patients with licensed sleep clinicians and coaches for personalized, medication-free treatment accessible from home.

1 investor

Clay makes collaborative 3D design software that lets users create and work together on three-dimensional projects. The product targets anyone seeking accessible tools for group-based 3D creation.

2 investors

Clear is an app that helps users track their skincare routines, products, and progress while connecting them with a supportive community. The platform serves skincare enthusiasts and acne sufferers looking for guidance and personalized tracking tools.

1 investor

ClicOH provides fulfillment, warehousing, and last-mile delivery services for e-commerce businesses across Latin America. The company uses AI-optimized logistics to offer same-day and next-day delivery directly to end customers.

12 investors

Clipdrop offers AI-powered image editing tools including background removal, object cleanup, image upscaling, and text-to-image generation. The platform serves creators and developers through both direct web tools and an embeddable API for product integration.

3 investors

Cloud Humans is a Brazilian AI company that combines an AI agent for customer support with an omnichannel platform supporting WhatsApp, Instagram, chat, and email. The platform automates up to 90% of customer service interactions while reducing manual ticket volume.

1 investor

A blog and resource platform focused on artificial intelligence applications in web development, offering tutorials, tool overviews, and case studies for developers.

1 investor

Coderhouse is an online education platform offering live courses and career programs in technology, AI, programming, design, and digital marketing for students across Latin America. The platform provides instructor-led classes, AI tutoring, hands-on projects, and professional certifications in partnership with leading technology companies.

2 investors

Codingal offers online after-school programs combining human teachers and AI-powered learning to teach coding, AI, math, and public speaking to K-12 students globally. The platform helps children build foundational computer science skills and future-ready competencies through live classes and self-paced learning paths.

3 investors

Compose.ai offers a Chrome extension that uses artificial intelligence to autocomplete text across web applications, functioning similarly to email autocompletion tools but with broader applicability.

2 investors

ControlHub is a procurement software platform that automates purchase-to-pay (P2P) workflows for businesses, including requisition management, purchase order generation, approval workflows, and supplier management. It serves small to mid-market organizations seeking to reduce procurement costs and operational inefficiencies through a centralized system.

6 investors

CoVerified develops digital health technologies for pandemic management and outbreak prevention, enabling organizations to safely navigate reopening. The platform is designed by clinicians, public health experts, and technologists to support the return to operations with reduced disease transmission risk.

1 investor

Curvenote builds an open-core platform for sharing and publishing scientific research with dynamic, interactive content rather than static PDFs, enabling researchers to preserve code, data, and reproducibility in their published work. The platform serves academic and research institutions globally and contributes to open-source science communities.

1 investor

Cyble provides threat intelligence and security solutions for organizations to protect against cyber threats across their attack surface. The company serves enterprises including Fortune 500 firms and government entities in the cybersecurity industry.

5 investors

Darrow is an AI research lab building intelligence infrastructure to identify legal risk and regulatory exposure across the economy by analyzing dispersed information sources before litigation emerges. It serves legal professionals, regulators, and policymakers who need to understand and act on legal risk signals.

3 investors

Dashlabs.ai builds practice management and lab information software for diagnostic laboratories, featuring billing, appointment scheduling, instrument integration for automated test result generation, medical imaging support, and secure result distribution to employers and staffing agencies.

3 investors

Dataherald provides an API that converts natural language queries into SQL, enabling product developers to add no-code data analytics and reporting features for their users.

1 investor

Datrics provides AI-powered medical coding software that processes healthcare insurance claims for providers, aiming to reduce errors and speed up claim handling.

1 investor

Dayra provides APIs that enable Egyptian businesses to offer loans and financial accounts to their workers and customers. The platform helps unbanked individuals access credit and banking services through their employer's application.

3 investors

Degrees of Freedom operates a blended higher education program combining in-person, online, and virtual reality instruction from established faculty, priced at the level of a Pell Grant.

1 investor

Djamo is a mobile fintech app offering banking services including current accounts, savings accounts, investment funds, short-term credit, and VISA cards for users in the UEMOA zone. The platform enables money transfers, bill payments, salary deposits, and financial management tools with no hidden fees.

5 investors

DreamWorld is a multiplayer 3D game platform that lets players build worlds using generative AI tools, targeting adults aged 13-40 who have outgrown earlier user-generated-content games. The platform combines advanced building capabilities with social features and supports large-scale concurrent player counts.

2 investors

Dressd operates a peer-to-peer clothing rental marketplace where individuals can lend items from their wardrobes to others, targeting users who need different outfits frequently, such as for recurring social events.

1 investor

Dyte builds real-time video communication APIs that enable video calling and collaboration features for applications and platforms. The company serves developers and enterprises building communication-dependent applications across web and mobile.

1 investor