Founders Directory LogoFounders Directory

Discover the next generation of startups.

A curated directory of high-growth companies backed by the world's most prestigious venture capital firms.

858Companies

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Ardent logo

Ardent

YCombinator

Database sandboxes for Agents

Clone any postgres DB regardless of size in 6s so agents can test their work

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Arga Labs logo

Arga Labs

YCombinator

Real-world sandboxes to test agents and agent-facing software

We build environments to test your app and agents against the real world. Deploy your code/agent into a sandbox that runs against replicas of external services (Stripe, Slack, Google Drive, etc.). Twins support the same APIs, MCP tool calls & SDKs as the real software, and you can spin up thousands of instances in parallel and seed them using natural language. Run real workflows, surface edge cases, and observe how your code/agents actually behave before hitting production.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Armature logo

Armature

YCombinator

Armature builds, monitors and optimizes products' Agent Experience.

Armature helps companies monitor, analyze, and optimize how AI agents experience their products. What we do today: - Automated testing: We run complex sessions against your MCPs/CLIs across all major harnesses and models to catch broken workflows before your users do. - AX analytics & benchmarking: No more black boxes. We trace agent sessions to show you exactly what the model "thought", what context it missed, and why it failed. We measure your AX against competitors to ensure you remain the preferred platform for agents to use. - Auto-remediation: Our MCP lets your internal coding agents plug into Armature to autonomously fix your product's AX based on our run data. Our vision for tomorrow: Reaching full understanding of how agents use your product and how you can improve it is only step one. The next step is to provide the foundational infrastructure for the Agent Experience, powering agent-native revenue, lifecycle marketing, and customer support for the next generation of software.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Arzana logo

Arzana

YCombinator

The autonomous ERP for every manufacturer

Arzana trains custom models on a factory's historical data and use them to deploy agents that automate their quoting, order entry, invoicing, and other repetitive office work. We've saved our customers over $1M in avoided staff costs. In the future, we'll expand into shop-floor automation, sending instructions to machinery and robots to produce the orders that our office agents processed. By 2035, we aim to fully automate 10,000 American factories.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Asendia AI logo

Asendia AI

YCombinator

AI recruiters for staffing agencies

Asendia AI replaces the top-of-funnel recruiter. Our AI agents clone each agency's best human recruiter: their knowledge base, screening logic, outreach style, and judgment, then run the full workflow across phone, SMS, WhatsApp, and email, 24/7. A req comes in; by the time a recruiter sits down, Asendia has already sourced, screened, and drafted submittals. Staffing is a $200B+ industry where speed is the entire margin.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Aseon Labs logo

Aseon Labs

YCombinator

Robotic pitstops for self-driving cars

Aseon Labs builds robotic pitstops for self-driving cars. Autonomous vehicles can drive themselves, but they still rely on humans and centralized depots for charging, cleaning and servicing multiple times per day. As fleets scale, the operational layer makes up 70% of the cost of the service and is of the largest barrier to uptime, profitability and market expansion. Aseon Pods are robotic micro-depots that can be deployed directly within operating zones, bringing fleet servicing to where demand exists. By eliminating unnecessary depot trips and automating routine operations, Aseon helps autonomous fleet operators increase uptime, reduce reset cost by 50% and unlock scale. Founded by the team behind Pushme, which deployed 5,000 mobility infrastructure locations across 40 cities before its acquisition by TIER-Dott, Aseon is funded and building product in Redwood City for pilot deployment with major autonomous vehicle operators.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Ashr logo

Ashr

YCombinator

Automated Multi-Modal Testing for Agents

Ashr is a fully contained test and evals platform that improves AI agents by ensuring accuracy and quality across a wide range of user journeys through your product. Ashr generates user journeys through your agents’ tool calls, results, and questions. We don’t generate one off tests, we generate large amounts of authentic user stories through your product, and pick up on errors, inconsistencies, and failures that would otherwise take hours of manual testing or get caught by a customer. We also work to ensure agent response quality in line with your business goals by offering custom evaluation metrics. Ashr works with voice, text, automated website generation, image, file generation, and multimodal. We’re also willing to generate custom input types or make modifications for anyone interested. Currently, we integrate as an SDK, and are proactively working to make our documentation and resources as accessible and easy to use as possible.

San FranciscoY Combinator LogoWinter 2026ActiveSan Francisco
Asimov logo

Asimov

YCombinator

Real-world human movement data for humanoid robots

Asimov collects real-world human movement data from households and businesses to train humanoid robots. Unlike factory datasets that capture the same tasks in the same environments, we deliver the full diversity of real human environments, thousands of hours a day to leading labs.

San FranciscoY Combinator LogoWinter 2026ActiveSan Francisco
Assemble logo

Assemble

YCombinator

Agents for Enterprise IT

Assemble accelerates IT teams by performing development work inside core enterprise systems like ERP, CRM, and HRIS. Our agents help IT teams scope dependencies, build logic, and validate changes across your systems.

San FranciscoY Combinator LogoSummer 2026ActiveSaaSEnterprise SoftwareAISan Francisco
Assembly logo

Assembly

YCombinator

Advanced manufacturing and distribution solutions (for China-based…

Crowdfunding has fueled an increase in innovative product companies turning to Chinese factories for production. Yet, Chinese factories seem undifferentiated because they all make the same, unverifiable claims of excellence. This results in competition centered on price. Factories are forced to under-bid contracts to win business, but often, they later surprise the customer with quality problems and delays. This process is broken. We install cameras and remote monitoring software on the assembly line, and this ensures compliance with test protocol, improves quality, reduces liability, and helps fight warranty fraud. We charge a nominal per-unit fee to the OEM and revenue share with the factory when they demonstrate compliance with quality standards (whether units pass or fail). It encourages better behavior from factories and rewards those who perform with an audit trail of good performance that helps them win new foreign business. On average, defect rate will fall 75% within 5 months of deploying Assembly at a factory.

San FranciscoY Combinator LogoSummer 2015ActiveLogisticsManufacturingChinaSan Francisco
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