Top Y Combinator Startups in Seattle 2023

Relativity is building humanity’s multiplanetary future. We invented a new approach to design, build, and fly our own rockets, starting with Terran 1 – the world’s first entirely 3D printed rocket, and Terran R, our next generation medium-heavy lift fully reusable launch vehicle. As a vertically integrated technology platform, Relativity is at the forefront of an inevitable shift toward software-defined manufacturing. By fusing 3D printing, artificial intelligence, and autonomous robotics, we are pioneering the factory of the future. Disrupting 60 years of aerospace, Relativity offers a radically simplified supply chain, building a rocket with 100x fewer parts in less than 60 days. We believe in a future where interplanetary life fundamentally expands the possibilities for human experience. Our long-term vision is to upgrade humanity’s industrial base on Earth and on Mars.

Helion is creating the world’s first fusion power plant, enabling a future with unlimited zero-carbon electricity.

Mixpanel is analytics for builders that need answers from their data at their fingertips. When everyone in the organization can see — and learn from — the impact of their work, they are poised to make better decisions. Companies like OpenAI, Netflix, Pinterest, sweetgreen, CNN, samsara, Uber, and Yelp use Mixpanel to understand their customers, measure progress, and endeavor to make better decisions.

GiveCampus is the world's #1 fundraising platform for non-profit educational institutions. Trusted by millions of donors and more than 1,300 colleges, universities, and K-12 schools, our mission is to advance the quality, the affordability, and the accessibility of education. We provide software, services, and expertise that help schools raise more money, from more people, at a fraction of the cost of other fundraising methods. Since 2015, our platform has facilitated more than $3.5 billion in charitable giving.

Dagger is a programmable CI/CD engine that runs your pipelines in containers. Develop your pipelines as code, in the same programming language as your application. Choose your SDK and start coding! Dagger executes your pipelines entirely as standard OCI containers. This has several benefits: - Instant local testing - Portability: the same pipeline can run on your local machine, a CI runner, a dedicated server, or any container hosting service. - Superior caching: every operation is cached by default, and caching works the same everywhere - Compatibility with the Docker ecosystem: if it runs in a container, you can add it to your pipeline. - Cross-language instrumentation: teams can use each other's tools without learning each other's language.

Gordian is building the OS for air travel. Our APIs enable the world's leading travel organizations to delight travelers and increase revenue. Our customers are companies like Priceline, Hopper and Trip.com, and we support over 140 airlines including partnerships with Lufthansa Group, United Airlines, and Singapore Airlines. Gordian has grown rapidly, including 3.5x revenue growth in H1 2022 and serves more than 60 million passengers per month. Launched in 2017, Gordian is backed by Y Combinator, Accomplice, Vinyl, Kinnevik, DST Global Partners, Latitude, and Naval Ravikant. For more information, visit gordiansoftware.com

Stoke Space delivers goods to and from orbit using 100% reusable rockets designed to fly daily.

Shelf Engine helps businesses increase sales by accurately predicting the perfect amount of perishable goods to order, thus reducing food waste.

We help companies build and scale marketing campaigns through WhatsApp, reaching their customers anywhere in the world with engaging conversations. With our platform, businesses can create and send conversations massively to users and get analytics to improve their campaign performance over time, increasing conversion in every stage of the funnel.

Line.Build is software for contractors to seamlessly find and apply for financing and rebates for energy efficiency upgrades. With buildings accounting for almost 40% of US GHG emissions, retrofitting for efficiency is essential to reduce emissions and load on the grid, but expensive. Over $80B of rebates, incentives and financing is available but hyper-fragmented across utilities, federal funds, grants, and green lending programs. Line consolidates disparate sources of funds and simplifies finding and applying for incentives and financing. Line is designed to be user-friendly, available in multiple languages, and accessible on both web and mobile devices. Additionally, it provides an API that seamlessly integrates with existing quoting tools, enhancing efficiency and convenience.

Gleam helps independent insurance brokers offer self-funded health plans to their SMB clients. We automate banking, plan administration, and compliance. With Gleam, brokers win more business by offering the highest-quality health insurance plans to their clients at a fraction of the cost.

Watto AI uses LLMs to generate McKinsey quality reports in seconds. Customers use us to generate anything from high-quality marketing reports, custom white papers to product documents and more.

highlight.io is the open source, full-stack monitoring platform. With just a few lines of code, Highlight makes it easy to understand what's slowing down your users and swiftly address errors and regressions on your web app. Imagine that you have a customer reporting an issue on your web app. With highlight.io, you can playback their exact interactions to reproduce the bug and get notified of any future errors that could happen. That being said, we’re just getting started! We have plans to go way deeper into your observability stack to give you all of the visibility you need. Join us on this journey: - Star us on GitHub (https://github.com/highlight/highlight) to keep up with releases and news. - Join our Discord (https://highlight.io/community) to share product feedback and thoughts.

Berry offers an AI CSM that scales customer success for SaaS companies. Every post-sales organization faces the challenge of scaling customer success without having to hire more. Berry combines the best of the two worlds - taking the white-glove onboarding experience and offering it at scale. Our AI CSM onboards, trains and grows accounts for you non-stop. It’s a 10x hire to your team - at a fraction of the cost.

Kivo Health provides telehealth rehab for chronic lung disease patients. We offer an 8-week clinical program led by a live therapist, which saves payers $6,000 per patient. Only 3% of eligible patients are getting this life-changing therapy right now.

We are starting out with our global expense management software for the entertainment industry, which still rely on spreadsheets and paper receipts to manage the $650B+ they spend each year.

Intuned is the first comprehensive platform to author, monitor, and scale integrations built to connect to services without official APIs. Our platform makes it possible for you to build a reliable API on top of any website with a tenth of the effort it would take you to do it today.

Feather makes it easy for any company to start offering their own branded retirement accounts, within days. Using Feather, you can build and launch retirement products like IRAs and solo-401(ks), without having to worry about things like custodian relationships, compliance, tax documents, contribution limits, rollovers, distributions, and other back-office tasks.

Needl is an AI receptionist that helps small businesses handle incoming calls. Instead of sending customers to voicemail, Needl books appointments and answers customers' questions.

Chordio is planning software for remote product development teams. It brings a new standard of collaboration to enable teams to establish a living source of truth for their plans, and provide visibility to stakeholders across engineering, sales and marketing at any level of the company.

Crypto Wallets are currently too geeky for mainstream users. We are building CypherD Wallet to solve this and take the web3 browsing experience to mainstream users. We launched our beta app last month and the current wallet works for EVM chains and also has one of the world's first non-custodial crypto cards as an add-on. We also have built the world's cheapest EVM cross-chain bridge.

Next-Gen API Documentation with AI Brilliance. Generate Stripe-like API docs in just a few seconds.

Cash Flow Portal is an investment management platform for real estate. We launched 5 months ago, and we have 6-figure ARR, growing 50% month over month, with 300 syndicators and 3,000 investors. We’ve grown quickly because I am a syndicator myself. Having raised $20MM for my own deals, I know how painful it is to manually prepare Docusigns, send wire instructions and wrangle investors. I also happen to be friends with 2,000 other syndicators just like me needing a solution for managing their investors. I’m not just a syndicator. I spent most of my career as an engineering leader at Lyft, Twitter, and Amazon. $20K ARR per syndicator gives us a $2B TAM. Having achieved my own financial freedom through real estate investing, our mission is to serve all real estate investors and help them achieve financial freedom.

Demo Gorilla is a browser extension for live SaaS demos that tells your sales team exactly what to say to sell your product. Keep everyone on the same page with the best customer stores, competitive talking points and feature explanations. Collect insights across product, engineering, marketing, and sales experts to ensure your sales team always knows exactly what will close this deal. - Automatically get relevant talking points for the part of the product you're on and who you're talking to - Track notes and metrics back in to your CRM - Share slides and images in line while demoing to set the stage - Clean up your UI to keep attendees focused

AeonCharge is building a roaming hub to connect every EV charger and electric vehicle on the road. We’re the largest aggregator in the country, with 76% market coverage and access to over 70,000 charging stations.

Strobe Marketplace is a content licensing platform that makes it easy for creators and brands to collaborate.

VacationHomeRents helps users explore and compare vacation rental options across many listing platforms such as Airbnb, VRBO, Booking.com, etc.

LifeAt is your space to focus and complete tasks. Our mission is to help the 100M+ knowledge workers get into their flow state with video content and task management. Our customers get through their daily tasks twice as fast while feeling great at the end of the day! Well funded by Meta (Facebook), Line, Y Combinator, Goodwater, and other top VCs. Loved by over 1M+ users across the world and shared by over 500K+ followers across Tiktok/Instagram/Twitter. Come shape the future of focus and productivity!

Strac DLP (Data Loss Prevention) eliminates data leaks from SaaS, Cloud and Generative AI apps by automatically detecting and redacting the most sensitive customer data like SSN, DL, Passport, Bank Statements, etc. across all communication channels like Office 365, Gmail, Slack, Onedrive, Google Drive, Zendesk, Salesforce, ChatGPT, Chrome, Jira and Web Applications.

Uberduck makes AI vocal generation tools for music professionals, hobbyists, and marketers. Vocal samples and full songs produced by our text-to-speech, text-to-singing, text-to-rapping, and voice conversion technologies power: - AI remixes and original songs for musicians ranging from hobbyists to the largest DJs in the world. - Personalized musical content in marketing campaigns. - A variety of music-related consumer experiences built on top of our APIs.

Equipt Health makes it easy for any healthcare company to offer prescription medical devices to patients. We handle the whole process: the packaging, the logistics, the clinical (via our provider network) and technical support, and the return of data from connected devices. We're starting with the diagnosis and treatment of sleep apnea at heliosleep.com.

We have built a platform that enables drug discovery and development for previously undruggable genome regulators ("the regulome"). We accomplish this by moving drug discovery out of artificial systems where regulome proteins fail to function properly, and back into live human cells. Our technology combines innovations in automated cell processing, next-gen proteomics, and advanced data analytics to measure a drug's effect on the entire regulome in one experiment.

The future of work is pseudonymous and permissionless - aka, purely meritocratic. Anybody in the world, irrespective of their geography, race, sex, background should have equal opportunity to participate in the global economy. Questbook is building the following tools and infrastructure - Open sourced, free learning material at https://learn.questbook.xyz - Grants management tool at https://questbook.app - Wallet SDK for developers to integrate an in-app signature mechanism, at https://docs.zerowallet.org - Pseudonymous identity app (https://reclaimprotocol.org)

Nimbus helps organizations unlock the full value of their observability data. The Nimbus Observability Engine automatically analyzes incoming telemetry data and generates transformations that reduce volume without dropping data. With Nimbus, companies of all sizes can reduce their total data volume by 50% or more while retaining full insight of their services.

Promoted optimizes top online marketplaces. For example, on Airbnb, we would sort search and promote the best listings at the top to increase revenue. We are building a first-party-everywhere ad network. We are all ex-Facebook and Google ads engineers, and we have built this before together.

We founded Inspectify with the goal to make a platform that helps inspectors, real estate professionals and home buyers alike. We see a tremendous opportunity to apply the latest technology to make inspectors more proficient and effective and make home inspections more engaging and value add to home buyers. We are just getting started, but are excited to provide much needed disruption in the space!

Awtomic powers DTC brands with an easy-to-use subscription management and discovery platform. Starting with a Shopify app, we'll give merchants the subscription product power of premium subscription brands like Dollar Shave Club and Ipsy. As we grow our support for more eCommerce platforms and merchants, we'll help customers discover new brands through cross-sells and make it easier for them to manage their subscriptions in one place.

Construction costs are climbing out of control, there is a declining construction workforce that gets smaller with every recession. Meanwhile, we’ve got a housing crisis in our major cities. Green Canopy NODE is the combination of NODE - construction technology start up that develops a house assembly kits that we manufacture in our factory in Seattle, and then ship flat-pack - like Ikea, and Green Canopy a vertically integrated developer, general contractor and real estate fund manager already operating in Seattle and Portland. We are continuing to develop and launch construction technology solutions including prefab components and software into our pipeline of residential projects ranging from small apartments, town houses, single family homes and small dwellings. Our mission is to build homes, relationships, and businesses that help regenerate communities and environments.

Milo is the Family AI. We give busy parents back time + mindshare by tackling the daily details with a behind the scenes co-pilot. By pairing a human in the loop with the latest in LLM capabilities we're able to effectively build a copilot for detailed, high context and noisy tasks, via a simple conversational SMS interface.

LunaTrace isn't just another security scanner that blasts you with vulnerabilities. LunaSec has developed a hosted Open Source dependency security tool that is smarter, faster, and quieter than any other. It's backed by a team of security experts who monitor the latest attacks, write remediation guides, and help you patch in hours instead of weeks. In under 2 minutes, for free, you can generate your own vulnerability report to gain insight into the security + compliance of your software by clicking here: https://lunatrace.lunasec.io/ Email us at: contact@lunasec.io Our GitHub: https://github.com/lunasec-io/lunasec

We build software to help restaurants manage their third-party delivery online orders.

Latchel is the only end-to-end platform that automates maintenance coordination and delivers best in class resident amenities. We service over 80,000 homes across over 400 customers in all 50 states of the US. We’re growing rapidly and need a Product Designer to continue our rapid growth trajectory.

Rebellyous Foods is a food manufacturing technology and production company defined solely to catapult meat alternative production toward price parity with animal-based meat. Rebellyous implements novel food manufacturing equipment and processes in large-scale production to produce low-cost plant-based meat at high volumes. These goals are achieved through uniquely designed food products, the use of high-throughput manufacturing automation and ‘smart’ production centers, and the development and utilization of new innovative low-energy manufacturing tools. Working closely with industry partners, Rebellyous makes plant-based meat sustainable, affordable, and widely available.

Worklytics identifies leading drivers of employee engagement, without the need for repetitive surveys. It does this by passively analyzing anonymous collaboration data, in tools like Google Workspace and Slack, and detecting patterns that lead to greater employee satisfaction. Worklytics uses these insights to promote positive organizational change by proactively nudging leaders and managers.

Sigma Genetics develops devices that can deliver DNA, RNA, and other charged molecules into cells by using magnetic fields. When compared to conventional electroporation, this technique has several key advantages, which include: the absence of arcing, the ability to scale, and the benefit of being non-invasive for in vivo applications. This platform technology can be applied to a wide range of applications- cell therapies, cancer drug delivery, DNA vaccines, biopharma manufacturing, and cosmetics.

BloomAPI simplifies how medical records are transferred. Today the majority of records are still moved by fax and couriers. Patients, Doctors, and Insurance companies all benefit when medical records are available when they are needed for the care of patients. We make this possible.

Deako believes that everyone should be able to enjoy the wonderful experiences of smart lighting, regardless of their budget. We invented the modular light switch, giving homeowners maximum flexibility to customize and upgrade their systems, at any time, in minutes and without turning off the power. Deako’s beautiful designer switches are like nothing else on the market today. Deako Smart Lighting has been named the #1 Smart Lighting Control System by TecHome Builder, Top 25 Innovative IOT Companies by Entrepreneur, featured in “I Want That!” episode on DIY Network, Top 50 most promising Startups by Bloomberg, and “Changing The Way Builders Spec Light Switches” - Builder Magazine.

Mason is the fastest way to take smart devices from idea to end user. Whether building a single-use device from scratch or scaling a line of smart products, with Mason it’s 20x faster and 10x less costly to build, deploy and scale. Digital transformation is a modern requirement but operating a hardware-dependent initiative is hard – thousands of hours and millions of dollars are at stake. The Mason Smart Device Platform is the only fully managed infrastructure for developing and delivering dedicated devices. It offers flexible usage-based pricing for fleets of devices and manages the underlying complexity of all associated backend services, making software delivery on a smart product line—whether it’s a tablet, wearable or new form factor—as simple as delivering software in the cloud. This frees innovators to focus on what matters: application development, feature specification and UX. Granular access to add, remove or lock down capabilities makes it possible for highly customized products to be built as envisioned. Mason offloads hardware investment risks and logistics, including inventory procurement, warehousing and supply chain management. With options like zero-touch provisioning, devices can work perfectly out of the box without end user intervention. Remote fleet management, troubleshooting and automated software updates by Mason ensure security and positive end user experiences. Organizations of all sizes rely on Mason to bring innovations and hundreds of use cases to market without reinventing the wheel. Smarter from start to finish with Mason.™ AWARDS * 2023: Best Places to Work & Best Startups to Work For, Built In Seattle * 2022: Best Places to Work & Best Small Places to Work, Built In Seattle * 2022: IoT Health & Wellness Innovation of the Year, IoT Breakthrough * 2022: Bronze Stevie® Award - Emerging Technology, The 2022 American Business Awards® * 2021: Deloitte Technology Fast 500™, Deloitte * 2019: Tech Impact Awards, Mobile - Silver, Seattle Business magazine Follow us on LinkedIn | https://www.linkedin.com/company/mason-america/

RescueTime helps you set boundaries, protect focused work time, and achieve work/life balance by shedding light on how you spend your time, improving your focus, and helping you find more time for the things that matter most. We are a distributed company with members spread throughout the United States.

Dyspatch by Sendwithus is a powerful communications platform built around advanced email content management. Our platform simplifies transactional email creation with a robust API, an easy to use editor, and built-in device testing, allowing for truly collaborative email strategy and execution. A centralized hub for email creation, approval, and publishing, our cloud-based solution empowers Product, Marketing, CRM, and Loyalty teams to efficiently build and test meaningful, dynamic communications without involving developers or deploying code. And with built-in support for 300+ locales, your teams can seamlessly manage localized content for global communications. Easily connect your cloud email provider or customize your integration to connect to your digital messaging service. Upload your existing templates in minutes. And from there, you’re well on your way to optimizing every email you send.

Wevorce is fixing divorce by ensuring kids come first, costs stay affordable, and the transition is appropriately paced, so that couples can focus on parenting, not fighting. For families, the Wevorce experience stands in stark contrast to the traditional adversarial approach. Instead of each spouse "lawyering up,"​ Wevorce brings them together to work with a specially-trained attorney-mediator who guides the couple through a defined, but fully customized, settlement process. Additional experts in finance and parenting are brought in as needed to ensure the settlement g... See More

Worksphere helps companies manage a hybrid workplace where employees work from the office and from home. We allow employees to reserve a desk, know who will be in office, and better coordinate in-person meetings. Companies can let go of unused office space and save money.

Shift Labs makes medical devices that place technology and design on equal footing to create affordable solutions. We emphasize simplicity and create devices that serve the fastest growing healthcare markets in the world. We believe that every person in the world deserves quality healthcare -- whether they are receiving care in the home, in an outpatient infusion center, or in an emerging market. We're a for-profit company committed to doing well, and doing good. We believe Simple Saves Lives. ___ In true startup fashion, we have a strategy that emphasizes early revenue. So check out our first product DripAssist, a low-cost IV fluid monitor and alarm. Get precision monitoring of blood transfusions or fluid delivery at a fraction of the cost of an infusion pump. Purchase at http://www.shiftlabs.com/purchase-dripassist

Founded in 2005, TextPayMe is an SMS payment service that lets you send money to other people using cell phone text messaging. TextPayMe lets you send money to anyone else in the US with an SMS-capable cell phone, and while phone carriers may charge for the actual text message sent/received, sending and receiving money is free while TextPayMe remains in Beta. In July 2006, the TextPayMe team started working for Amazon and, as of 2011, the site redirects to an Amazon's mobile payment website. There was no press release related to this event but it's assumed the company was acquired. Sending and receiving payments through TextPayMe is easy: simply write a text message to SMS@TextPayMe.com with "pay amount phonenumber" in the body (i.e. to send $5 to 123-456-7890, text "pay 5 1234567890"). The service is secure as well, as each payment needs to be confirmed by a user-created PIN. To fund your transactions, TextPayMe lets you add money directly from your bank account and now also lets you link your credit card as well. Currently, the maximum amount that can be sent or received per month is $500.