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Onshore uses AI to prepare corporate R&D tax credits. With our technology, anyone can prepare an R&D Tax Credit accurately and fast. To provide some background, the R&D Credit is often cited as the most complex and audited tax credit in the United States. With that in mind, we set out to create software to achieve two primary objectives: 1. Ensure that any credit computed with our software is exactly what the IRS is asking for in terms of quality. 2. Democratize the ability to perform high quality R&D Credit studies extremely fast.
New York, NY, USA51-200 employees
Ontra Mobility is founded by two former Googler engineers with PhDs in operations research. Ontra helps cities and other transit agencies increase ridership through data-driven planning and real-time optimization. The founders developed the software that powered MARTA Reach in Atlanta, GA and CAT SMART in Savannah, GA.
New York, NY, USA; Remote1-50 employees
Onyx is a modern, accessible private bank for the next generation of affluent young professionals. We offer a unified digital-native premium banking and wealth management experience tailored for the overlooked groups of young high-earners and illiquid entrepreneurs, investors, and tech employees. Onyx aims to be the next-generation UBS.
Miami, FL, USA1-50 employees
Opalite makes it easy for healthcare providers to communicate with non-English speaking patients. We’re built to work inside existing clinical workflows, so providers can communicate in real time without waiting for an interpreter or delaying care. Opalite is available instantly, 24/7, and replaces traditional interpretation services with software that’s more reliable and saves millions of dollars per year. We've built a voice AI system that is the safest, most compliant, and most accurate medical interpreter in the world.
Palo Alto, CA, USA1-50 employees
Open is an AI-powered, all-in-one customer support and communication platform — used in production by: Print.com, Mollie.com, Viva.com, More.com, Orderchamp.com, OneCarNow.com, and other major enterprise companies. We specialize in solving and automating complex support cases across email, web, phone, SMS, and WhatsApp. We’re a research-based company currently working on releasing Support-Bench, the world’s most comprehensive AI customer support benchmark. Our team consists of +3 programming language builders, a nationwide cybersecurity competition winner at age 16, and a dentist.
San Francisco, CA, USA; Remote1-50 employees
OpenBuilder is the vibe coding platform that helps non-technical builders take their ideas to production. Instead of paying for credits and getting stuck. OpenBuilder offers unlimited build credits, gets you unstuck and ready for production. It's also an open platform where you have access to all of your code from day one.
San Francisco, CA, USA1-50 employees
OpenFoundry is an open source platform that helps engineers build, deploy, and scale their open source AI stack 10x faster. Ship your AI stack with just one line of code. You could think of us as an open source alternative to Hugging Face. Learn more and check out a demo of this in action in our Launch YC post: https://www.ycombinator.com/launches/KhY-openfoundry-developer-infrastructure-for-open-source-ai
San Francisco, CA, USA1-50 employees
OpenFunnel is the Search Engine for GTM. Searching for "B2B SaaS, 501-1000 employees, uses Salesforce" - is just targeted spam. Even if you get creative with LLMs to query these databases, everyone has access to the same commoditized databases, these databases lack insights about right timing or pain-points prospects face. OpenFunnel is a time-aware search engine for insights and activities in your target segment - that reveal pain. You can search for activities like: "Find companies looking to implement usage based billing" "Find companies that moved from OpenAI to self-hosted models in the last 3-6 months" "Find companies who updated their pricing page to introduce an enterprise plan in the last 3 months" OpenFunnel continuously monitors these time-based signals, delivering actionable insights daily - so you have the fastest, unique insights that your competitors miss out on. Over 1000+ users are already discovering prospects through pain-first search, including some of the fastest-growing companies like Central, Mintlify, and Everest Systems.
1-50 employees
OpenInt helps teams ship product integrations in hours, not weeks, using no or low code. Read and write data using unified APIs or sync it straight to your database.
Remote1-50 employees
OpenIntake boosts law firm revenue by converting callers into clients 24/7.
New York, NY, USA1-50 employees
OpenMeter's mission is to standardize metering with the goal of becoming the data source for AI and API monetization. We've built an open-source platform that processes billions of events into our usage lake in a matter of seconds, which acts as the backbone that serves revenue and efficiency teams.
1-50 employees
OpenSight helps companies quickly scale up their support function and resolve customers' questions much faster. With the latest advancement in LLMs, OpenSight offers accurate answers and action resolution paths resolving >70% of inbound customer inquiries.
San Francisco, CA, USA; Sunnyvale, CA, USA; Remote1-50 employees
OpenCall builds AI voice and texting agents that boost revenue and cut costs. Our voice and text agents reduce labor costs by up to 70%, while increasing revenue up to 20% through improved booking rates and customer satisfaction.
1-50 employees
Opennote is a notebook with an AI thinking partner built in. Feynman lives in your work: it edits your writing, references your knowledge and the web, runs background tasks, and gives feedback as you work.
San Francisco, CA, USA1-50 employees
Openroll is the AI-native operating system for compensation. Openroll gives companies a single system where compensation finally happens. Offers are sent instantly, budgets stay aligned automatically, promotions stay consistent, and salary decisions are made with confidence. Instead of fragmented tools, spreadsheets, and manual approvals, compensation runs end-to-end in one intelligent system used across the entire organization. Learn more at https://www.openroll.com
Stockholm, Stockholm County, Sweden1-50 employees
Operand builds and deploys AI systems that help companies run their business better—using data, machine learning, and decision systems to drive day-to-day strategy execution. They work with leading retailers, manufacturers, distributors, and capital allocators on guiding everything from pricing, forecasting, allocation, diligence, and more.
San Francisco, CA, USA1-50 employees
Get opinions from anyone by talking to an AI chatbot trained on their content
London, England, United Kingdom1-50 employees
Opslane is a developer-first Kubernetes delivery platform. Connect your repo and get previews, safe rollouts, and instant rollbacks — no YAML, no ops team required.
San Francisco, CA, USA1-50 employees
Optery is automated opt out software, and we serve individuals, families and businesses. With Optery, you can remove yourself from hundreds of data brokers that are posting and selling your home address, phone number, email and other private information on the internet. Optery received the “Editors’ Choice” award by PCMag as the most outstanding product in the personal data removal category in 2022, 2023, 2024, and 2025, the Cybersecurity Excellence Awards for Attack Surface Management, Digital Footprint Management, and Employee Privacy Protection in 2024 and 2025, Cyber Defense Magazine’s Top InfoSec Innovator and Best Attack Surface Management awards in 2024 and 2025, the 2025 Fortress Cybersecurity Award for Privacy Enhancing Technologies, and Fast Company’s Next Big Things in Tech award for security and privacy in 2023. In 2025, Optery was also listed by Business Insider as one of 30 early-stage startups most likely to become a unicorn. Optery prevents phishing and social engineering, identity theft and fraud, online stalking and harassment, ransomware, doxxing, and prevents people's private information from showing up in Google search results. Anyone can create a free account to receive a personalized Exposure Report with live screenshots summarizing where your information is being posted and sold online. Optery then provides free tools for self-service removals, or you can upgrade to a paid plan, and Optery will remove the profiles for you. Optery for Business serves enterprises removing personal information from the internet for their employees and executives, and offers an API enabling application developers to embed data broker scanning and removal technology into their applications.
San Francisco, CA, USA; Remote51-200 employees
Optifye.ai does AI performance monitoring for factory workers We place cameras in factories and use vision AI to tell supervisors who's working and who's not in real time. The shop floor has historically been a black box. With Optifye, manufacturing companies can now accurately measure worker output and boost efficiency!
San Francisco, CA, USA1-50 employees
Opusense AI automates field report writing for construction field inspectors. Instead of typing up notes at the end of the day, inspectors can now walk a site, speak observations aloud, snap photos, and let our AI assistant generate a detailed, organized report on-site and in real time. Combined, the founding team has over 15 years in the construction industry. Writing up these field reports used to take up at least 20% of the week. With Opusense, we cut that time by 5x. Our team combines deep construction experience with technical expertise, Roya has a PhD in civil engineering, and Michael has worked at multiple construction tech startups. Why hasn’t this been done before? Construction is slow to adopt new tech, and reporting is messy, photos, voice notes, and field notes all live in silos. Turning that into a clear, structured report requires real insight into how inspectors work and what clients need. Only now, with advances in AI, can we process unstructured data adequately to generate high-quality reports in real time. The opportunity is massive. Every inspection firm and contractor is struggling with documentation. Manual reports slow them down, create inconsistencies, and delay handoffs. We believe AI can do this better, and Opusense is proving it.
1-50 employees
Ora is an AI-native education platform that students love. We're starting with medical school, training students from matriculation to MD. Soon, we'll serve every corner of the $830B higher education market.
San Francisco, CA, USA1-50 employees
Orange Slice is a spreadsheet where every column is TypeScript—and AI writes it for you. Describe what you want in chat ("find the CEO's LinkedIn and get their email"), and we generate the code, create the columns, and run it across thousands of rows. Our fully-typed SDK has 100+ enrichments built in: LinkedIn, contact info, company data, web scraping, AI research. Columns automatically execute in dependency order. No workflow builders—just describe it or code it.
1-50 employees
Orbio uses satellite imagery to track methane emissions from the oil & gas industry. We sell the data to financial companies that want to invest into the best performing energy companies. Until today, oil & gas companies use excel-based emission factors to calculate and report their emissions. As these excel-based emission factors underestimate actual emissions by ~70%, the finance companies that invest into oil & gas can’t mitigate against incoming risks from new regulations, We have built a technology that can for the first time use satellite images to track methane from every single oil & gas facility on the planet, replacing emission factors and allowing finance companies to make the best bets on oil & gas companies that will withstand a wide avalanche of incoming regulation. In the summer 2023 our satellite-based technology got ranked #1 both in terms of accuracy and sensitivity of methane emission events by Stanford University in a peer-reviewed study, beating a range of multi-bn dollar competitors like Maxar. Learn more at https://orbio.earth
Remote1-50 employees
Orbital Operations is developing a high thrust, reusable space vehicle for satellite defense. We protect critical satellites, like GPS and Military communication satellites, from adversarial threats, like China and Russia. Our vehicle will use the exact same propulsion systems that launch vehicles have used for decades by implementing a cryogenic management system. This will give us over 100x the thrust or current in-space propulsion. Ross and I have over 15 years of combined aerospace experience across NASA, Aerojet Rocketdyne, SpaceX, Blue Origin, and Relativity Space. We’ve worked side by side for more than 3.5 years developing propulsion systems, turbomachinery, and building our own respective engineering teams. We are currently working on the first demo of our unique cryo management system and intend to launch an operational vehicle by 2027.
1-50 employees
Orca lets you create and edit Minecraft servers, mods, and datapacks directly in your browser using an AI coding assistant, no setup required.
San Francisco, CA, USA1-50 employees
Orca is banking built for Gen Z from the ground up. Send money instantly, split bills with groups, access local discounts and perks, spend and save, and do everything else you could ever ask on Orca — the only financial hub you'll ever need.
Austin, TX, USA1-50 employees
Orchid is an AI-powered Electronic Health Record (EHR) for independent mental health professionals that saves them time, money, and frustration by integrating core administrative workflows, streamlining clinical processes, and automating manual flows.
San Francisco, CA, USA; New York, NY, USA1-50 employees
The best way to build any app with AI. If this mission resonates with you, we encourage you to apply for a role at orchids.app/careers.
1-50 employees
We are a consumer facing biotech company using the power of plant protein and biotechnology to deliver the next generation of sustainable seafood. Our mission is to bring balance back into our food system by empowering people to make greener choices one bite at a time.
Potsdam, BB, Germany1-50 employees
OrgOrg is a suite of apps that keeps teams productive and healthy regardless of the size of your organization. Founded by the creator of Zenter (YC 07, acquired by Google and became Google Slides), OrgOrg is designed to be a natural extension of Google Workspace Apps to help run organizations collaborate better leading to higher productivity. Today the suite includes apps like: • Go links: Go links allows anyone in the org to easily name any link so team members can jump directly to the information that matters most: go/sales, go/production, go/anything-you-want. • Profiles with Personality: OrgOrg profiles are as insightful as they are delightful. They not only show you the expected org chart data, but also highlight accomplishments, how you like to work, and who you are as a person. • Goal tracking: Track, share, and collaborate on "big rock" goals on the cadence that makes sense for your team from daily to annually. • Branded New Tab: Keep the team focused the next major milestone, broadcast announcements, and keep important links top of mind every time a new browser tab is opened. • All Hands Q&A: Crowdsource questions, anonymously if desired, for large team meetings to make sure everyone's voice is heard, and the most top of mind questions are answered and recorded. • Smart Groups: Create rules based groups of people and use them to make sure the right people are in the right conversations and have the right access. For example, anyone with the title of "Software Engineer" should be in the #eng slack channel and eng@ google group. • On-call: Schedule smart rotations that take into account balancing the load and using signals from calendar schedules to make sure you don't waste time figuring out who can cover what in a fair way. Easily page the on-call from slack, API, or OrgOrg directly. • And more... All the tools you need so you can spend more time focusing on your core business, and less time focusing on the complexity that comes from running an organization.
Los Altos, CA, USA; Remote
Origami is an AI-powered spreadsheet to find and enrich your ideal customers. origami.chat has 100+ data sources - use it to find more of your perfect customers, enrich a CSV, or get decision makers. Try it out and get a lead list in seconds, start free → origami.chat Used by sales teams at CBRE, Clipboard Health, Remote.com, and more.
San Francisco, CA, USA1-50 employees
We are building a "manipulate anything" model with the robot hardware that embodies it. We designed a hand-based data-collection device and a high DOF, direct drive robotic hand that match each other exactly, enabling us to eliminate embodiment gap and collect real-world data and deploy it directly. We want to scale real world manipulation data by deploying our devices "in the wild" like manufacturing factories, logistic centers to collect Tesla like data, use these data to train our model and then provide automation solutions to these industries.
Millbrae, CA, USA1-50 employees
Origami Therapeutics, Inc. is a biotech company developing novel protein degraders with potential to delay or halt disease progression by eliminating toxic proteins from the body. Our drug discovery platform leverages our proprietary human disease models developed to select the small molecules with the best chance of clinical success. Our first indication is Huntington’s disease, a debilitating, progressive and ultimately fatal disorder caused by a genetic mutation. We have already identified small molecules that reduce the toxic mutated protein, suppress mutant protein-induced toxicities in human disease neurons and get into the brain. We anticipate that this approach will be broadly applicable to traditionally “undruggable” targets in other neurological diseases.
San Diego, CA, USA1-50 employees
Designing novel regulatory DNA (e.g., enhancers and promoters) to program precise therapeutic gene expression patterns - for diseases like cancer, CNS disorders and more. We're building the largest proprietary dataset of synthetic regulatory sequences across diverse cell-states.
San Francisco, CA, USA1-50 employees
APIs weren’t built for agents. Orthogonal fixes that. Developers and agents get instant access to hundreds of APIs through our MCP or SDK. No API key management, no billing headaches, pay as you go. API providers list once and become instantly discoverable.
San Francisco, CA, USA1-50 employees
Our AI-powered software enables materials R&D engineers to design new materials much faster. To date, manufacturing companies rely on trial-and-error and manual approaches to develop new materials. This is a tedious and time-consuming process. Yet, carbon neutrality requirements urge manufacturers to adopt greener and lighter materials to decarbonize the industry.
Paris, Île-de-France, France1-50 employees
Osmosis helps companies use reinforcement learning to fine-tune open source models that outperform foundation models.
1-50 employees
Oto’s digital programs are the best way to manage tinnitus, and at a fraction of the cost of in person treatment. Tinnitus or ringing in the ears affects 1 in 8 people, and before Oto effective therapy was only available via expensive meetings with a specialist.
London, England, United Kingdom; Remote1-50 employees
OutSail Technologies is building unlimited-range wind-powered vessels using aerospace technology. We know modern aerodyamics can make wind cheaper and more reliable than internal combustion. The effects of fossil-fuel use are degrading the ocean and destroying the planet. It’s time for modern wind power. Outsail has brought a groundbreaking technology from satellites, the tape spring, to earth. Our fully autonomous, retractable wingsail allows vessels to access more wind power than ever before by providing both the aerodynamic efficiency of a wing and the perfect amount of area for the wind strength. OutSail is backed by Y Combinator (W23), and founded by two engineers and an aerodynamics PhD who have led teams, managed products, and designed hardware for Momentus, Nuro, AEye, Tesla and SpaceX.
Mountain View, CA, USA1-50 employees
Outerbase is the interface for your database. Companies use Outerbase to view, edit, and modify their data and even generate beautiful visual dashboards without having to write a single line of SQL.
Pittsburgh, PA, USA; San Francisco, CA, USA; Remote1-50 employees
Extract structured data from documents, tables, P&ID diagrams, process flow diagrams, GD&T drawings, electrical CAD, blueprints, and more. Build AI agents with tools that help them understand and measure the world.
San Francisco, CA, USA1-50 employees
Understand how customers find you, use your product, and convert to paid.
San Francisco, CA, USA1-50 employees
Outrove is the world’s most realistic AI recruiter, with a human-appearing interview agent that has both video and audio and can join Google Meet calls.
San Francisco, CA, USA1-50 employees
Overdrive Health offers AI powered medical billing services, helping providers get paid more money in less time. Our technology enables us to provide the best quality insurance and patient billing services for a fraction of the usual cost
New York, NY, USA1-50 employees
Overlap builds multimodal AI agents that can do literally anything you want related to video, such as finding specific moments, generating clips, or analyzing your video library. What takes media companies thousands of hours, we do in seconds.
San Francisco, CA, USA1-50 employees
Overlord knows everything about you (location, Mac data, health data, +dozens more), and can take actions (block Mac/iOS/Android, text/call you, text your friends, take your money) to force you to stay on track with your habits.
New York, NY, USA; Remote1-50 employees
Overshoot makes it easy for developers to build and run real-time vision applications. AI can see and understand the physical world. This unlocks new applications in physical security, safety, gaming, robotics and general consumer products. Soon, video agents will watch your home and your pet when you’re away. However, existing platforms make it painful for developers to build these real-time applications. Slow inference. Limited model availability. Break at scale. Overshoot solves this. Today, 300+ developers connect live video feeds to the largest collection of Vision Language Models with 3 lines of code. And get responses in less than 200ms. 10x faster than any existing inference platform. Zero infra headache. Our moat is focus. Image and Video are fundamentally different modalities from text. By focusing on them, we are able to make strong technical leaps from codec, streaming protocols to inference engines. Younes and Zakaria are cousins. Zakaria graduated top of his class at LSE and MIT, and later built low-latency high-throughput pricing systems (surge) at Uber and inference engines at Meta. He previously built and sold a software product and won several prominent AI hackathons. Younes was a founding engineer at Cosmonio (later acquired by Intel). He built a training and serving Computer Vision platform from scratch. He witnessed firsthand customers abandoning traditional Computer Vision because it lacked the “general” intelligence LLMs have today. Together we’ve shipped large-scale systems and know where they break.
San Francisco, CA, USA1-50 employees
Overstand is an on-demand data and insights team for customer communications. We unify Slack, email, calls, and operational data, then surface the signals that matter — customer needs, risks, and revenue opportunities hidden in everyday conversations. Instead of waiting on reports or manual analysis, teams get immediate, evidence-backed answers from the data they already have. Overstand delivers clarity and leverage as your business scales.
1-50 employees
Oversteer is building browser agents to automate web tasks and turn them into reusable, deterministic APIs. You can integrate the API into any system and automate/integrate any website or portal.
Irvine, CA, USA; Remote1-50 employees