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Group of paper airplane in one direction and with one individual pointing in the different way, can be used leadership\/individuality concepts.( 3d render )<\/p>\n
getty<\/p>\n
On September 9th, Y Combinator<\/a> will host its 43rd Demo Day, where more than 150 companies will present to an audience of investors and media. The event marks the culmination of YC\u2019s three-month program, during which founders receive funding, intensive mentorship, and access to a powerful network of peers and investors. While the structured program lasts only a few months, support from the YC community extends far beyond.<\/p>\n Meet The Builders<\/p>\n Every YC batch is unique, and Summer 2025 is no exception. The level of grind, energy, and ambition has been extraordinary\u2014pushing the boundaries of what most would think possible. And while the diversity of ideas is striking, it\u2019s no surprise that the majority of startups this time are building in AI, reflecting both the urgency and the opportunity of the moment.<\/p>\n Luminal<\/a><\/p>\n Luminal compiles AI models to deliver the fastest, highest-throughput inference cloud in the world. In the race to get to market first, most AI companies are leaving thousands of dollars on the table each month by failing to optimize their models. Luminal solves this by making AI models run up to 10x faster through its purpose-built compiler and cloud platform.<\/p>\n VibeFlow<\/a><\/p>\n Today, builders often stitch together tools like Lovable, n8n, and Supabase just to get a basic app running. These \u2018Frankenstein\u2019 setups are fragile, insecure, and rarely production-ready. Non-technical users still lack a single solution that can take them from idea to full-stack app. VibeFlow solves this by unifying UI, backend, and database into one platform\u2014enabling anyone to go from prompt to production in seconds.<\/p>\n TectoAI<\/a><\/p>\n Enterprises are racing to adopt AI tools, but most have little visibility into which ones employees are using\u2014let alone whether they\u2019re secure or compliant. The result is shadow AI, compliance risks, and wasted spend. Tecto addresses this with an \u2018HR system for AI employees\u2019 that discovers, vets, and continuously monitors third-party AI tools. With regulations tightening and AI adoption accelerating, the timing couldn\u2019t be more urgent.<\/p>\n Cacao<\/a><\/p>\n Every year, Brazil\u2019s digital workers lose billions in hidden taxes and fees just to access money they\u2019ve already earned. Cacao unifies what once took three or four apps into a single platform\u2014letting users receive USD, save in stablecoins, transfer BRL instantly via Pix, and spend globally with a Visa Platinum card. With Pix adoption surging and stablecoin payments newly legalized, now is the inflection point to make cross-border money instant, cheaper, and compliant.<\/p>\n The Prompting Company<\/a><\/p>\n The Prompting Company helps products get discovered inside ChatGPT and other large language models. As platforms like ChatGPT, Perplexity, Claude, and Gemini become the new starting point for brand discovery\u2014 with chatbot traffic more than doubling in the past year\u2014the shift is undeniable. The transition is happening fast, and investing in AI-driven visibility today gives brands a critical edge over competitors.<\/p>\n April <\/a><\/p>\n April is a voice AI executive assistant that manages email and calendars hands-free\u2014built for busy professionals who need an executive assistant but don\u2019t have one. With voice AI now achieving sub-second latency, truly conversational interactions are possible. Advances like MCPs and tool calls are making AI systems more reliable and action-oriented, enabling them to perform meaningful tasks rather than just generate text. <\/p>\n mcp-use<\/a><\/p>\n Software is shifting from static apps to agent-driven systems powered by MCP. The challenge is that dev teams want to build agents, but end up wasting time wrestling with server configs, authentication, and fragmented infrastructure\u2014nobody wants to reinvent the plumbing. This company solves the problem with a full vertical stack, from an SDK that makes MCP agents simple to build to a cloud control plane that manages hosting, security, and observability.<\/p>\n OnDeck AI<\/a><\/p>\n Companies are capturing more video than ever, but analyzing it with traditional computer vision remains slow, costly, and inflexible. Just as LLMs like ChatGPT unlocked reasoning over text, a new class of AI called Vision-Language Models (VLMs) can now do the same for visual data. OnDeck\u2019s task-specialized platform allows businesses to ask complex questions of their footage and get answers instantly\u2014without months of engineering. We\u2019re at the dawn of a new era for perception, and OnDeck is the infrastructure layer making this power accessible and scalable for enterprises.<\/p>\n Riff<\/a><\/p>\n AI is creating a generational opportunity to reimagine how music is made. Riff is a music editor with superpowers\u2014helping artists work faster and making it easier than ever for hobbyists to break into music.<\/p>\n Design Arena<\/a><\/p>\n Design Arena is a forcing function for AI design and visuals. Today, models can win IMO gold, yet still generate something as flawed as white text on a white background. Design Arena benchmarks models on their visual quality across websites, game design, 3D assets, and more\u2014while also putting builder tools like Lovable, Bolt, and v0 head-to-head.<\/p>\n Verne Robotics<\/a><\/p>\n Verne Robotics builds AI models that teach robots new skills in hours\u2014cutting training times from months to mere hours. This rapid learning makes robot automation far more accessible to companies of all sizes. Verne\u2019s robots help businesses cut costs by automating back-of-house tasks, powered by an innovative pay-by-the-hour business model.<\/p>\n Embedder<\/a><\/p>\n Physical technologies like autonomous vehicles, robotics, and intelligent devices are set for explosive growth in the next decade, but progress is bottlenecked by the firmware that powers them. Embedder is building an AI platform that enables engineers to create, test, and deploy firmware across complex embedded systems in record time.<\/p>\n Minimal<\/a><\/p>\n Minimal is building AI customer support teams for e-commerce companies. Traditional chatbots frustrate customers, and existing AI agent solutions are complex to set up and manage. Minimal makes it simple for brands to create and manage AI support agents that automate up to 80% of customer interactions across chat, email, social media, and WhatsApp. At the core is Minimal\u2019s AI Manager\u2014an agent that manages the agents. Instead of fiddling with dashboards or writing prompts, users can simply talk to the AI Manager, making setup as easy as talking to a colleague.<\/p>\n