Y Combinator Startups in Seattle 2024

December 2024

Browse 38 of the top startups funded by Y Combinator. Headquartered in Seattle, these are some of the hottest and fastest-growing startups.

We also have a Startup Directory where you can search through over 5,000 companies.

  • Wevorce (w2013)Active • 11 employees • Bothell, WA, USA
    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
    legaltech
  • Helion Energy
    Helion Energy (s2014)Active • 150 employees • Everett, WA, USA
    Helion is creating the world’s first fusion power plant, enabling a future with unlimited zero-carbon electricity.
    fusion-energy
    hard-tech
    climate
    energy
  • Dyspatch (w2014)Active • 20 employees • Victoria, BC, Canada
    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.
    saas
    b2b
  • Mason
    Mason (w2016)Active • 65 employees • Seattle, WA, USA
    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/
    hardware
    saas
    logistics
  • Deako (w2016)Active • 11 employees • Seattle, WA, USA
    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.
    iot
    home-automation
  • BloomAPI
    BloomAPI (w2017)Active • 7 employees • Seattle, WA, USA
    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.
    mental-health-tech
    consumer-health-services
    healthcare
  • Sigma Genetics
    Sigma Genetics (w2017)Active • 2 employees • Seattle, WA, USA
    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.
    biotech
    genomics
  • Worklytics
    Worklytics (w2018)Active • Seattle, WA, USA
    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.
    human-resources
    productivity
  • Rebellyous Foods
    Rebellyous Foods (s2018)Active • 12 employees • Seattle, WA, USA
    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.
    climate
    plant-based-meat
  • Shelf Engine
    Shelf Engine (s2018)Active • 40 employees • Seattle, WA, USA
    Shelf Engine helps businesses increase sales by accurately predicting the perfect amount of perishable goods to order, thus reducing food waste.
    machine-learning
  • Gordian Software
    Gordian Software (w2019)Active • 20 employees • Bellevue, WA, USA
    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 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
    travel
  • Latchel
    Latchel (w2019)Active • Seattle, WA, USA
    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.
    saas
  • LunaSec
    LunaSec (s2019)Active • 4 employees • Seattle, WA, USA
    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
    developer-tools
    devsecops
    security-orchestration-automation-and-response-(soar)
    security
    open-source
  • Green Canopy NODE
    Green Canopy NODE (s2019)Active • 31 employees • Seattle, WA, USA
    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.
    hardware
    housing
    proptech
  • adyn
    adyn (s2020)Active • 7 employees • Seattle, WA, USA
    fertility-tech
    machine-learning
    consumer-health-services
  • Humanly
    Humanly (w2020)Active • 30 employees • Bellevue, WA, USA
    Our mission is to empower the world’s hiring teams to grow engaged, high-performing organizations - by delivering human connection at scale through innovative technology, commitment, and fairness. High-volume hiring is extremely broken - it is inefficient, ineffective, and biased. Our mission is to fix what is broken. We believe great hiring processes are centered around quality conversations between candidates and employers and a future where every candidate’s journey starts with a conversation - a future where candidates are considered without bias or archaic artifacts like resumes and cover letters.
    recruiting
    hr-tech
  • Awtomic
    Awtomic (s2020)Active • 11 employees • Seattle, WA, USA
    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.
  • Inspectify
    Inspectify (s2020)Active • 55 employees • Seattle, WA, USA
    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!
    marketplace
    real-estate
    proptech
  • Stoke Space
    Stoke Space (w2021)Active • 85 employees • Seattle, WA, USA
    Stoke Space delivers goods to and from orbit using 100% reusable rockets designed to fly daily.
    space-exploration
    satellites
  • Talus Bio
    Talus Bio (s2021)Active • 16 employees • Seattle, WA, USA
    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.
    biotech
    genomics
    drug-discovery
  • Truss
    Truss (s2021)Active • 12 employees • Victoria, BC, Canada
    Truss is an all-in-one banking and payment automation platform for construction businesses. With Truss, construction companies can manage bill payments, receivables, and corporate cards in one place. They can save time on manual data entry by integrating Truss with their existing tools and automating the full billing cycle, from invoicing and reconciliation.
    fintech
    payments
    construction
  • Equipt Health
    Equipt Health (s2021)Active • Seattle, WA, USA
    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.
    sleep-tech
    consumer-health-services
    digital-health
    telemedicine
  • LifeAt
    LifeAt (w2022)Active • 6 employees • Seattle, WA, USA
    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!
    consumer
    productivity
  • Hubble Network
    Hubble Network (w2022)Active • 20 employees • Seattle, WA, USA
    Hubble is building a global satellite network that any Bluetooth-enabled device can connect to, even without cellular reception. Our mission in life is to get a billion devices connected to the network and unlock a new era of human-machine collaboration.
    developer-tools
    hard-tech
    hardware
    iot
    satellites
  • VacationHomeRents
    VacationHomeRents (w2022)Active • 4 employees • Seattle, WA, USA
    VacationHomeRents helps users explore and compare vacation rental options across many listing platforms such as Airbnb, VRBO, Booking.com, etc.
    marketplace
    consumer
    travel
  • Instant Labs
    Instant Labs (w2022)Active • 1 employees • Victoria, BC, Canada
    Instant Labs started in 2005 by building the fastest domain search engine on the internet: https://instantdomainsearch.com. People have performed over 2.5M searches and purchased 250K domains with our free tool. In 2023, we released Strobe, https://strobe.app, an AI-powered tool to help brands find creators to help them grow.
    saas
    b2b
    marketing
    ai
  • Cash Flow Portal
    Cash Flow Portal (w2022)Active • 19 employees • Seattle, WA, USA
    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.
    marketplace
    saas
    real-estate
    b2b
    proptech
  • Chordio
    Chordio (s2022)Active • 4 employees • Issaquah, WA, USA
    Chordio is an AI product designer that learns about products and generates designs based on requirements provided through a chat interface. For example, a product manager uses Chordio to visualize a new user flow in their product in minutes instead of days.
    saas
    b2b
  • Aurelian
    Aurelian (s2022)Active • 2 employees • Seattle, WA, USA
    Aurelian automates non-emergency calls to police departments. Our AI-powered operator instantly routes, triages, and resolves calls so citizens get exactly what they need and 9-1-1 dispatchers get to focus on emergencies. Upwards of 80% of total call volume faced by public safety agencies are administrative calls e.g., citizens trying to pay parking tickets or reporting a power outage. Aurelian lessens this burden and lets 9-1-1 dispatchers deal with actual emergencies.
    artificial-intelligence
    saas
  • Oneloop
    Oneloop (s2022)Active • 2 employees • Seattle, WA, USA
    Oneloop is a modern API key management and authentication platform. What this means is that with a single line of code, you can start issuing API keys, authenticate them, add rate limits, and track usage limits to your API product If you have an API product or building your own AI models, we can help you add API key authentication and management to your product, with our sdk and pre-built UI.
    developer-tools
    saas
    b2b
    infrastructure
  • Intuned
    Intuned (s2022)Active • 7 employees • Kirkland, WA, USA
    Intuned is an AI enabled cloud platform to author, deploy, and monitor integrations to extract web data and execute browser automation. We enable engineers to build reliable integrations to access data and complete actions on other web services when official APIs are not available or complete.
    artificial-intelligence
    developer-tools
    robotic-process-automation
    b2b
    api
  • Matano
    Matano (w2023)Active • 2 employees • Seattle, WA, USA
    Matano is a modern SIEM, built for cloud-first security teams. It replaces traditional SIEM databases like Splunk or Elastic with a cybersecurity platform built on top of a cost-effective Security Data Lake.
    devsecops
    analytics
    open-source
    cybersecurity
  • TextPayMe (s2005)Acquired • 11 employees • Redmond, WA, USA
    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.
  • Shift Labs
    Shift Labs (w2015)Acquired • 6 employees • Seattle, WA, USA
    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
    hardware
    medical-devices
  • Cuboh
    Cuboh (s2019)Acquired • 50 employees • Victoria, BC, Canada
    We build software to help restaurants manage their third-party delivery online orders.
    saas
    food-tech
  • Worksphere
    Worksphere (w2021)Acquired • 6 employees • Seattle, WA, USA
    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.
    saas
    b2b