Top 9 Startups from Y Combinator's Latest Demo Day

Last week, Y Combinator presented its Summer 2025 Demo Day, highlighting the latest cohort of more than 160 startups.

Similar to recent batches, most startups showcased solutions centered on artificial intelligence. A distinct evolution, however, was noticeable. Rather than just offering "AI-powered" products, many companies are now developing AI agents or building the foundational infrastructure and tools required for their creation. This batch, for example, featured a surge of voice AI solutions and new ventures focused on enabling others to profit from the "AI economy" through advertising and marketing tools.

We consulted several investors who specialize in Y Combinator companies to discover which startups they found most compelling and which attracted the strongest investor interest.

The most frequently highlighted companies are listed below:

Autumn

What it does: Provides Stripe-like payment infrastructure tailored for AI startups.

Why it’s a fave: Many AI companies employ intricate pricing models that combine a fixed subscription fee per user with usage-based billing, credits, and additional costs. Manually managing these complex AI pricing structures on Stripe is a labor-intensive process. Autumn addresses this by offering an open-source infrastructure that streamlines Stripe integration specifically for AI startups. The company reports that its technology is already utilized by hundreds of AI applications and 40 YC startups. Given Stripe's leadership in payments and the rapid expansion of the AI sector, could a specialized billing platform for AI emerge as the next major fintech triumph?

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Join over 10,000 tech and venture capital leaders for growth and networking at Disrupt 2025

Gain insights from more than 250 industry leaders from Netflix, Box, a16z, ElevenLabs, Wayve, Sequoia Capital, and Elad Gil, who will lead over 200 sessions focused on driving startup growth and enhancing your competitive advantage. Celebrate the 20th anniversary of TechCrunch and learn from top tech innovators. Secure your ticket by September 26 to save as much as $668.

Dedalus Labs

What it does: Creates a Vercel-like platform for deploying AI agents.

Why it’s a fave: Similar to how Vercel simplifies deployment and hosting for developers, Dedalus Labs offers a platform that automates the underlying infrastructure needed to build AI agents, transforming hours of coding into a few simple clicks. The platform manages complicated tasks such as automatic scaling and load balancing, which the company states makes deploying agents both quick and straightforward.

Design Arena

What it does: Crowdsources rankings for AI-generated designs based on aesthetic appeal.

Why it’s a fave: The capacity of AI to produce a vast quantity of designs creates a new challenge: identifying which ones are high quality. Design Arena addresses this by using crowd-sourced evaluations of AI-generated visuals, establishing a feedback cycle that encourages AI models to improve. Major AI labs recognize the value in training their models to produce superior designs, and some are already customers of Design Arena.

Getasap Asia

What it does: A technology-driven distributor serving retailers across Southeast Asia.

Why it’s a fave: Getasap Asia was established by Raghav Arora three years ago when he was only 14. Since then, the startup, which uses technology to supply corner stores, restaurants, and major supermarkets in Southeast Asia in under eight hours, has generated millions in revenue. According to its website, Getasap Asia secured funding from General Catalyst, and industry sources indicate the startup's valuation was among the highest in the entire YC batch.

Keystone

What it does: An AI engineer that identifies and fixes software bugs in live production environments.

Why it’s a fave: Founded by 20-year-old Pablo Hansen, who recently earned a master's degree in AI, Keystone aims to reduce software failures. The company's AI detects and corrects bugs for clients such as Lovable and has already rejected an acquisition offer in the seven-figure range, according to Hansen.

RealRoots

What it does: An AI-powered platform that matches women for friendship.

Why it’s a fave: While dating apps are plentiful, RealRoots addresses a different form of social isolation. Its AI matchmaker, named Lisa, conducts interviews with women and then arranges social events to connect them with compatible friends. Although the AI component might be partly for engagement—as conversations with Lisa may not provide significantly deeper insights than written questionnaires—RealRoots appears to have found a promising niche. The founders reported the company earned $782,000 from 9,000 paying customers last month alone.

Solva

What it does: Uses AI to automate the insurance claims process.

Why it’s a fave: Solva's AI handles the most repetitive tasks for insurance adjusters, from completing complex claim forms to preventing erroneous payments. Just ten weeks after its launch, Solva has already achieved $245,000 in annual recurring revenue (ARR), a metric that has generated significant excitement among investors.

Perseus Defense

What it does: Develops low-cost mini-missiles designed to counter drones.

Why it’s a fave: With reports of China accumulating large numbers of low-cost drones, the U.S. military has an urgent requirement for affordable anti-drone systems. Perseus is creating precisely that: compact missiles intended to neutralize drones at a fraction of the cost of current defense systems. Several branches of the U.S. military have already requested demonstrations from the startup, which could potentially lead to substantial government contracts.

Pingo AI

What it does: An AI-based foreign language tutoring application.

Why it’s a fave: While apps like Duolingo have made learning a language accessible and engaging, they often miss a crucial element for achieving fluency: regular conversational practice. Pingo addresses this gap by enabling users to converse with its AI, which simulates a native speaker. This unique method is proving highly successful, with founders reporting a 70% monthly growth rate and generating $250,000 in monthly revenue.