Y Combinator Summer 2021 (S21) Companies

Abatable provides a platform to help organizations navigate environmental markets for forest protection, clean energy, and community development projects. The platform connects buyers, investors, and project developers in carbon and nature-based markets.

3 investors

Abbot is a Slack bot that monitors customer conversations to ensure timely responses, automatically summarizes discussions, identifies relevant topics, and recommends follow-up actions for customer support teams. It also provides team responsiveness metrics and allows users to trigger automated workflows based on customer inquiries, schedules, or external events.

1 investor

ABHI creates financial products designed for consumers in Pakistan. The company aims to reduce financial stress through innovative solutions in the fintech sector.

8 investors

Abstra provides a platform for finance teams to build and execute automated workflows in Python, replacing manual spreadsheet-based processes and integrating with enterprise systems like SAP for tasks such as reporting, reconciliations, and approvals. The platform enables both finance and technical staff to convert operational procedures into code with version control and auditability.

2 investors

Adaptyv Bio develops technologies for protein engineering that enable the design and testing of new proteins for applications in medicine, industrial enzymes, and functional materials. The company serves protein engineers and researchers developing therapeutic and industrial biological products.

5 investors

Adni operates a platform connecting healthcare workers with employment opportunities while providing tools for credential management and professional networking; the platform also serves healthcare employers seeking to identify and screen clinical talent through AI-powered recruiting capabilities.

3 investors

Adravision builds a shared intelligence platform that integrates fragmented dental information systems, connecting clinical records, radiographs, treatment plans, and insurance data to support care delivery, documentation, and reimbursement.

2 investors

AdvantageClub provides employee benefits and corporate engagement platform that connects brands with employees and clients through exclusive rewards and privileges. The platform serves enterprises seeking to enhance employee experience and wellness while enabling brands to reach targeted customer segments.

8 investors

StarCompliance provides a connected compliance platform that unifies employee and firm compliance workflows, including pre-clearance and post-trade oversight, gifts and entertainment tracking, political contributions, insider trading detection, and regulatory compliance across multiple jurisdictions and asset classes including equities and digital assets.

1 investor

Affogato is an all-in-one AI studio for generating, editing, and upscaling images and video with 170+ models integrated into a single workspace. It serves creators and marketers in fashion, product photography, and advertising who need consistent character and brand representation across multiple formats and shots.

2 investors

Agapé is a mobile app designed to strengthen romantic relationships through daily personalized questions that spark meaningful conversation between couples. The app uses machine learning to tailor questions to users' preferences and offers both free and premium subscription tiers.

2 investors

Ahazou provides ready-made social media content and templates for entrepreneurs and small business owners across 100+ industries, allowing them to publish daily posts, stories, and videos without hiring agencies or freelancers. The platform offers customizable content options with logo personalization and weekly publishing calendars at a fraction of traditional marketing costs.

1 investor

AI Tech Packs provides software that generates factory-ready technical specifications and bill-of-materials (BOM) documents for fashion apparel designers and manufacturers. The platform automates the creation of technical specifications from garment photos, sketches, or flats, replacing manual work in Excel and Illustrator for design teams at fashion brands and factories.

1 investor

Akudo provides a digital banking service in India for teenagers, offering personalized prepaid cards with gamified incentives for saving and financial management. The service combines banking products with embedded financial education designed for young users.

2 investors

Akute Health is an electronic health record (EHR) system designed for independent, cash-based clinical practices including direct primary care, med spas, and telehealth clinics. The platform offers task-based workflows, patient communication tools, and administrative automation to reduce overhead and enable providers to focus on patient care.

1 investor

Aleph is a financial planning and analysis (FP&A) tool built with a spreadsheet-first approach that integrates company-wide data. It serves finance teams who need to understand historical data, monitor current performance, and forecast future results.

4 investors

Alephee is a B2B platform that digitally connects brands, manufacturers, wholesalers, retailers, and service providers in the automotive industry to facilitate supply chain management, product sourcing, and sales. The platform provides analytics, business networking, and catalog management tools to support inventory distribution and market expansion across the automotive ecosystem.

1 investor

Algofi develops financial infrastructure designed to lower entry barriers and increase accessibility in financial services.

2 investors

AlgoUniversity offers competitive programming education and interview preparation for tech roles, serving aspiring engineers and job seekers. The platform provides courses, assignments, contests, and placement support led by a team of competitive programming experts and industry professionals.

1 investor

AlgoViral helps high-growth startups scale their social media presence using AI and data-driven automation. The platform creates and publishes organic content at scale, identifies high-performing posts, and converts them into targeted ads.

1 investor

An online insurance broker operating in Egypt that sells insurance policies to customers significantly faster than traditional insurers. The company targets the Egyptian market, which has low insurance adoption relative to its population size and growing demand.

4 investors

Anakin provides an API that extracts structured data from websites for AI agents and data teams, adapting automatically when site layouts change and operating across thousands of sites globally at reduced cost compared to browser-based approaches.

1 investor

Ananya Health develops a portable, battery-powered cryoablation platform for treating pre-cancerous cervical lesions at the point of care in any clinic setting. The medical device targets expanding access to cervical cancer prevention in resource-limited settings by eliminating reliance on costly cryogen gas supply chains.

2 investors

Ancana operates a fractional co-ownership marketplace for vacation homes in Mexico and the United States, allowing multiple owners to share luxury properties. The platform serves affluent consumers seeking vacation home ownership without the burden of full property management.

4 investors