Top Tech Startups in California, US in 2026

Realm is building the modern financial advisor for your house. Primary residences account for 62% of the average American’s total assets, but there’s no accessible platform homeowners can turn to for unbiased, actionable advice — until now. From the day you buy your home to the day you sell it, you’re making a series of expensive and confusing decisions. To navigate these decisions, homeowners try to cobble together information from biased experts, googling, and friends. Realm's free insights and tools help homeowners across the US make informed decisions. Our nationwide product is powered by technology, with a human touch. Our insights help homeowners navigate complex & expensive home decisions, ranging from how much to spend on a kitchen renovation to when to refinance.

Hiring has a trust problem. Fake candidates, stolen identities, proxy interviewers and AI-fed answers are now common enough that most teams have met one without knowing it. A resume is easy to fake. An interview is easy to outsource. By the time it surfaces, the cost has already landed on the team. Aperture is the human intelligence platform. We make sure the person you hire is the person who interviewed. We bring identity verification, candidate fraud detection, background verification and threat intelligence together with adaptive AI interviews and λ-CORE, our candidate evaluation engine, so hiring teams can see who is real and who is actually good long before a final round.

Behind every opportunity is someone who introduced you. The investor who funded your company. The customer who changed its trajectory. The person who introduced you to your co-founder, next hire, mentor, or partner. Yet our professional networks have never been larger, and we still struggle to answer a simple question: Who should I know? Introd helps you discover the people you should know, understand how you're connected, and find the right path to an introduction. We’re building the relationship layer for opportunity: intelligence that turns fragmented professional networks into an understanding of who knows whom, which relationships actually matter, and where the strongest opportunities exist. Underneath Introd is a relationship graph that brings together signals across the places professional relationships already live. AI and graph intelligence help identify relevant people, understand relationship strength, rank connection paths, and surface opportunities that would otherwise remain hidden. For a founder, that might mean discovering the right investor or customer. For an investor, the right founder. For an executive, a strategic partner or key hire. For a community, it means turning hundreds or thousands of members into relationships that actually create value. We don't believe the future of professional networking is another feed, another directory, or collecting more connections. It's knowing the right people at the right moment. That’s what we’re building. The right people. Stronger relationships. Real opportunities. You’re one introduction away.

Metriport is an open-source platform that makes it easy for healthcare organizations to access and exchange medical data for their patients.

Creatify is the leading AI-powered video ad generator, creating high-converting ads with product links. As the #1 most-used AI video ads generator, we harness the power of AI to craft video ads that outperform competitors at a fraction of the cost. Our mission is to democratize ad creation. With over 500,000 users and a revenue growth of over 100x since December 2023, we're a rapidly moving startup with a long road ahead. This is still Day 1. We’re backed by top AI investors and founders, including: - AI Grant (created by Nat Friedman and Daniel Gross), Millennium (backers of Facebook, Spotify, Alibaba), Leadout Capital, and more. - Founders of Viralspace AI (acquired by Smartly), Percept AI (acquired by Atlassian), and Market AI.

We’re a hypergrowth AI startup backed by top-tier VC firms. We’ve created a new paradigm for enterprise artificial intelligence with a breakthrough technology called Organizational Memory (OM1). It’s fundamentally reshaping how people do work. Unlike any other AI product, OM1 builds “a brain” for companies–knows what’s happening in real time across the whole business, and has all the output capabilities of a human employee. Roles like Product, Engineering, G2M, and Management will never be the same. And while we’re starting by selling our technology to other software businesses, we have the ability to serve hundreds of different industries. We're not just building another productivity tool. We're ushering in a fundamental revolution in how humans do work. With proven product-market fit, rapid YoY ARR growth, and household-name customers, we’re expanding our team to dominate what will be a $10T+ industry. And we’re only just getting started.