Y Combinator Winter 2015 (W15) Companies

Flip operates a mobile marketplace where users buy and sell rare and limited-edition sneakers from verified sellers, with transactions completed within 90 minutes.

2 investors

GitLab is an intelligent orchestration platform for DevSecOps that enables teams and AI agents to collaborate on the full software development lifecycle, from planning through deployment, with integrated security and compliance capabilities.

22 investors

Giveffect provides a peer-to-peer and team fundraising platform for nonprofits, enabling organizations to recruit team leaders and coordinate fundraising campaigns through customizable, branded campaign pages. The software integrates CRM functionality, donor tracking, payment processing, and real-time analytics to simplify nonprofit fundraising operations.

1 investor

GiveMeTap sells reusable water bottles and operates a network of refill locations at participating cafes and restaurants; 20% of bottle revenue funds clean water access projects in Africa through partnerships with NGOs.

1 investor

Glassjar is an AI savings coach that analyzes real-time bank data to identify cost reduction opportunities for small and medium-sized businesses, complementing traditional accounting with automated cash flow optimization and expense monitoring.

1 investor

GrubMarket is a food tech company operating a B2B and B2C marketplace in the U.S. and Canada, offering both wholesale produce delivery at discounted prices and AI-powered SaaS software solutions for food supply chain businesses including inventory management, warehouse operations, and eCommerce platforms.

18 investors

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5 investors

iMicrobes uses synthetic biology to develop cost-effective sustainable materials and replace conventional manufacturing processes. The company focuses on circular economy principles, converting waste streams into value through biotechnology.

3 investors

Instavest is a platform where investors can publicly share their stock trades and rationale, allowing other users to replicate those purchases and sales, with a portion of profits directed back to the original trader.

2 investors

Kickpay offers financing solutions for e-commerce companies, allowing them to defer payment for inventory until after sales occur, rather than paying upfront.

5 investors

Labdoor provides independent product testing, rankings, and data across multiple consumer product categories. The company operates a verified commerce model where consumers purchase products through the platform, with revenue supporting expanded product testing and research.

4 investors

Level Frames provides online custom framing services for digital photos and physical artwork, posters, prints, and documents. The company designs and handcrafts museum-quality frames to order using archival materials and ships them to customers in the United States, Canada, and the United Kingdom.

1 investor

Lucira Health manufactures portable diagnostic devices that connect to smartphones to test bodily fluids for infectious diseases, enabling rapid results outside of clinical settings.

4 investors

Lully develops an under-mattress device that uses timed vibrations to prevent night terrors in children. The company applies clinical sleep science and user research to create products addressing sleep problems in pediatric populations.

1 investor

Lumi supplies branded packaging and shipping materials to e-commerce businesses ranging from startups to large-scale retailers.

1 investor

Magic provides managed virtual assistant teams for executives and growing businesses, handling administrative tasks like calendar management, email, travel planning, and operational coordination. The service delivers a dedicated team of remote assistants configured to specific workflows, with managed payroll, training, and auto-replacement.

5 investors

Makrwatch is a platform and service provider that manages influencer marketing campaigns by connecting creators with brands, handling sourcing, contracting, and payment logistics at scale. The company serves consumer goods, software, education, and finance brands seeking to work with creators across all content niches globally.

1 investor

Mashgin develops automated checkout kiosks using computer vision and machine learning to instantly identify items without scanning or barcodes, serving retailers in stadiums, hospitality, hospitals, and foodservice venues.

3 investors

Meadow provides software for cannabis dispensaries, offering inventory management, compliance automation, and reporting tools. The platform serves cannabis retail operators seeking to streamline operations and regulatory adherence.

1 investor

Mezmo provides an intelligence layer for production AI that enables platform engineering and SRE teams to deploy reliable AI-powered workflows in production. The company pairs a control plane (AURA) with an optimized data plane to support use cases like incident detection, root cause analysis, and automated operational workflows.

5 investors

MobyDish operates an online catering platform that lets customers order meals for groups of 10 to 1,000 people, coordinating restaurant selection, delivery, and setup through its proprietary dispatch system. The service caters to businesses in major US cities seeking both last-minute and planned catering for meals and events.

1 investor

Moltin provides API-based commerce infrastructure that allows retailers and developers to build and deploy shopping experiences across websites, mobile apps, and other customer touchpoints. The platform offers modular APIs, developer tools, and pre-built components to handle core commerce functions.

4 investors

Nextop IO provides a mobile content delivery network with a client-side library for iOS and Android that routes traffic through optimized proxy servers, reducing latency, improving throughput, and lowering data and battery consumption for mobile applications connecting to backend services.

1 investor

Perk is a platform that combines trip booking, expense management, and financial controls for corporate teams. It provides flight, hotel, train and car booking, AI-powered expense capture and categorization, invoice management, event planning, and policy-enforced corporate cards for enterprises.

1 investor