Y Combinator organized Summer Demo Day 2025 last week, showing the latest party over 160 startups.
As in the case of the last parties, most of the startups presented solutions focused on AI. However, clear evolution was visible. Instead of “powered AI” products, many firms are now building AI or infrastructure and tools needed to develop them. For example, this party had a lot of Voice AI solutions and recent firms focused on helping others earning “AI economy” in commercials and marketing tools.
We talked with a handful of investors focused on YC to search out out which startups considered the most interesting and which caused the highest investment demand.
Below are the most commonly listed:
What does it do: Stripe for ai startups
Why is this favorite: Many AI startups use complex price models, which frequently mix a flat subscription fee for a place with fees based on use, loans and various costs of allowances. Managing complex prices of artificial intelligence on stripe is a time -consuming manual process. That is why Autumn has developed an open source infrastructure that simplifies the integration of the AI Startups. The company claims that its technology is already used by tons of of AI applications and 40 YC startups. Given the dominance of Stripe in payments and the explosive development of the AI market, can a specialized settlement solution for AI be one other large history of fintech success?
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What does it do: Builds Wercel for AI agents
Why is this favorite: Like Vercel, it helps programmers to implement and host startups, Dedalus Labs claims that its platform automates the infrastructure for building AI agents, crossing the coding hours to a few clicks. The company supports complex tasks, resembling auto -stalking and balancing the load, which, in response to it, makes the implementation of an agent quick and easy.
What does it do: Crowdsource of vibe coded rankings
Why is this favorite: The ability of artificial intelligence to quickly generate a huge number of projects creates a recent problem: determining which of them are really good. The Arena Design solves this through crowdsourcing rankings of visualizations generated by AI, creating a feedback loop that forces AI models to enhance. Large AI laboratories see the value in training their models to generate higher projects, because some of them are already clients of arena design.
What does it do: Distributor supporting technology for retail sellers in Southeast Asia
Why is this favorite: Getasap Asia was founded by Raghav Arora three years ago, when he was only 14 years old. Since then, the startup, which uses technology to supply stocks to corner stores, restaurants and large supermarkets in Southeast Asia in lower than eight hours, has earned tens of millions of revenues. Getasap Asia closed the round from the general catalyst, in response to this websiteAnd we hear that the startup valuation was one of the highest in the whole party.
What does it do: AI engineer who repairs production errors
Why is this favorite: Founded by 20-year-old Pablo Hansen, who obtained a master’s degree in artificial intelligence last 12 months, Keystone has a mission of limiting the software break. Hansen said that the company’s artificial intelligence finds and fixes errors for customers resembling Lovable and has already rejected the seven -digit acquisition offer.
What does it do: Ai matchmaker for friends
Why is this favorite: Although there is no shortage of dating applications, Realroots deals with a different type of loneliness. AI Matchmaker, Lisa, interviews women, and then organizes social experience to mix them with compatible friends. While the AI part will be performance – conversations with Lisa probably wouldn’t give realoes more information about participants than written answers – Realroots may have something. Last month, the company generated USD 782,000 from 9,000 paying customers, its founders gave it.
What does it do: Automates insurance claims by artificial intelligence
Why is this favorite: AI Solva automates the most routine tasks for insurance regulators, from fulfilling complex claims to forestall incorrect payments. Just ten weeks after starting Solva, it has already gathered 245,000 USD repetitive revenues (ARR), which is excited about investors.
What does it do: Mini-Misile with a counterattack
Why is this favorite: With China apparently Congregation of swarms of inexpensive drones, the American army is on the urgent need for profitable counter-Dron solutions. Perseus is working this: small missiles designed to find out drones for a fraction of the costs of existing systems. Many branches of the American army have already invited a startup to exhibit its solution, which might result in strong contracts.
What does it do: And a foreign language teacher
Why is this favorite: Applications resembling Duolingo have made language learning to be available and fun, but they often lack a key element of liquidity: a consistent conversation. Pingo solves this problem, enabling users to check with his artificial intelligence, which acts as a native speaker. The company’s unique approach seems to be extremely popular, and the founders claim that it grows 70% per 30 days and earns USD 250,000 monthly revenues.