Nov 18, 2025 12:10:39 PM

Companies


Showing 4026-4050 of 5661 companies
YC F24
RevisionDojo logo

RevisionDojo

AI tutors for students.

RevisionDojo is building the AI study platform students actually obsess over. Our platform houses pre-loaded question sets, study notes, mini-lessons guided by an AI tutor that adapts to each student individually.

YC W22
Reviving Mind logo

Reviving Mind

Addressing Loneliness and Isolation for Seniors

Navigating chronic illness is an isolating and lonely process which ultimately reduces medical adherence and adversely impacts outcomes. There are over 100 deadly chronic conditions as 1 out of 2 Americans is currently living with at least 1 chronic condition. The US healthcare system has over $1 trillion dollars in direct costs. Medical adherence rates for therapeutic programs and medicine are only 50% because patients feel lonely, isolated, and unsupported in their chronic illness journey. Reviving Mind is an in-network telehealth provider that improves clinical outcomes and program adherence for the senior medicare and medicare-advantage population that is plagued with loneliness and chronic illness. This is done through a novel and proprietary clinical program and technology platform that integrates virtual, private, curated, and professionally led groups that scale up to 8-patients with individualized and goal oriented lifestyle medicine coaching that is automated but managed by a licensed provider. Scaling rapidly across the United States.

YC W16
Revl logo

Revl

AI edited video souvenirs as a service

Revl is an experience technology company and Y Combinator 2016 Winter Batch member launching the Revl Arc smart action camera. Designed in coordination with frogVentures, Sony, Ambarella and leading engineers with backgrounds at NASA, HP and Sikorsky Aircraft, the Revl Arc is available for preorder and will begin shipping in December. Revl was founded in 2015 and is based in San Francisco. For more information, please visit www.revl.com

YC S21
Revolve Surgical logo

Revolve Surgical

Surgical robotics for every operating room

Revolve is building the world’s only surgical robot designed for every operating room. Its simple yet powerful design makes it the only robot that can service the 1M+ abdominal surgeries performed outside of hospitals in the US every year.

YC W22
Revoy logo

Revoy

Make diesel semi trucks hybrid-electric

SixWheel makes diesel trucks hybrid-electric in 3 minutes at zero upfront cost while delivering $25k more profit per truck annually.

YC F24
Revyl logo

Revyl

AI-Native Mobile Testing

Revyl is a AI-native mobile testing platform that automatically catches and triages bugs before they reach production.

YC S24
Rewbi logo

Rewbi

Rewbi uses AI to increase grid-connected battery storage revenue 2x

Rewbi uses AI to optimize grid-connected battery storage. We generate revenue by charging when electricity is cheap and discharging when electricity is expensive. We rent battery storage for a fixed fee per month, and we earn 2x that fee in monthly revenue by dispatching the battery optimally. Today, power companies use human traders to manually track grid conditions and update the battery’s dispatch schedule. However batteries can adjust their power output 100x faster than traditional power generation (e.g. hydro, coal, nuclear, gas), with the ability to go from full-speed charging to full speed discharging in under a minute. Electricity prices change every 5 minutes, often by 300% or more. Our AI better tracks 100s of live inputs, and it makes decisions faster than a human operator (with lower overhead!), improving revenue 2x.

YC S23
Reworkd logo

Reworkd

The simplest way to extract web data at scale

At Reworkd, we're working on multimodal LLM agents that serve as the simplest way to extract web data at scale. Customers come to us with lists of 100s to 1000s of websites along with a data schema. Our agents traverse these websites, understand their structure, and generate code to extract data from them. We've been working on LLM agents since their inception and have received over 30k stars on GitHub and 1M+ users across previous agent products. If you're interested in our pilot program, shoot us an email!

YC W18
Rhythmm logo

Rhythmm

Read interesting conversations

Rhythmm is a social app that enables its users to share interesting thoughts and conversations. Users can follow awesome channels and tap through each thought, finding their Rhythmm. They can also create their own channel, invite others to contribute or rock it solo, and the app help with the rest. Rhythmm wants to take live chat conversations from experts and interesting people and let others follow along. The startup wants to take the insights people are getting from chat groups on Telegram and remove all the noise with their own platform. Only people who have been invited by the chat creator can participate, everybody else just follows the conversations.

YC S17
Ribbon Health logo

Ribbon Health

Health enterprise API for data on doctors, insurance, costs, & quality

Ribbon Health is a health care data platform that provides the critical infrastructure that health insurers, medical providers, and digital health solutions need to enable accurate provider directories, reliable referral management, and efficient care navigation. We offer a seamless API layer that integrates into each health care organization's existing workflow to build connectivity across the industry and continuously improve the accuracy of its data with its spread and use. Ribbon is the only solution to offer all of these capabilities in one platform, and delivers the most comprehensive data on doctors, insurance plans, and the cost and quality of care culled from thousands of sources. By providing this infrastructure, Ribbon delivers on its mission of making it easy for every health care decision to be high-quality, cost effective, and convenient.

YC W14
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Rickshaw

Same day local delivery, via API. Currently operating in SF.

Rickshaw is a local delivery platform that partners with courier companies and delivers several goods, including laundry, gifts, office snacks, and meal subscriptions. It uses algorithms and mobile apps to dispatch, route, and track customer locations. The service is available from Monday to Friday from 7.00 a.m. to 10.00 p.m. Rickshaw was launched by Divya Bhat and Gautam Jayaraman.

YC S25
Rid logo

Rid

Sell with a text.

At Rid we're determined to make selling easier than buying. All you have to do is text us what you're selling, and we'll take care of the rest -- researching the product, listing on marketplaces, negotiating with buyers, answering questions, and handling delivery. We all have that thing we've been too lazy to sell. Rid makes it so easy we can't even be lazy.

YC S17
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RideAlong

We save lives by giving police and health workers key info to safely…

RideAlong is a software tool that gives patrol officers key information about people with mental illness at the scene—everything from tailored de-escalation techniques to personalized service referral options.

YC W12
Ridecell logo

Ridecell

AI for Automotive Leasing and Mobility

Ridecell is leading the way in the digital transformation of fleet businesses and operations. Our Fleet Automation and Mobility solutions modernize and monetize fleets by combining data insights with digital vehicle control to turn today’s manual processes into automated workflows. The result is unmatched levels of efficiency and control for leasing, rental, government, commercial and shared fleets. Today Ridecell powers some of the most successful fleet businesses and the leading government fleets in cities across Europe and North America. Our customers and partners include: Penske - the largest truck fleet in America with 400,000 trucks Mobility fleets for Toyota, Ford, Daimler, BMW - - the largest OEMs in the world and BNP Paribas, Arval: 1,500,000 vehicles, the 2nd largest fleet in Europe And the largest government fleets in the world including San Francisco, New York City, the Belgian Government Our platform makes these businesses more intelligent, accessible, efficient and safer by connecting and automating the core technology pillars including vehicle technology like telematics, camera and ADAS system, and enterprise platforms including CRM, commerce and finance systems. Ridecell is headquartered in San Francisco, California with offices in Tokyo, Madrid, Paris, Bordeaux, Berlin and Pune, India.

YC S11
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Ridejoy

Long-distance carpooling marketplace. Shut down in early 2013.

Ridejoy is a community-driven marketplace for sharing rides. Ridejoy making it easy to share rides with friendly people. If you're going on a trip, you can list extra seat space in your car, and if you need to get somewhere, you can find a ride, using their service.

YC W22
Rider logo

Rider

Modern parcel delivery for online sellers in Pakistan.

Rider is building modern parcel delivery for online sellers in Pakistan. We are doing $130K in monthly revenue, delivering 200K orders per month across 60 cities. Unlike traditional logistics players, Rider’s solution is: Easier to use (integration with shipper portals, delivery agent app, end- customer app); Quicker (route optimization, next day deliveries, 24-hour cash repayment); Transparent (resolves ‘fake attempt’ deliveries, offers live tracking) and Flexible (shipper and customer control on delivery location and times).

YC S25
Riff logo

Riff

Cursor for music production

Riff is a music editor with superpowers — helping artists work faster and making it easier than ever for hobbyists to break into music. As we continue to build, we see Riff turning into an entirely new paradigm for creating music.

YC S16
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RigPlenish

On average each Ambulance run is two hours long, 40 minutes is spent…

Our vision is to reduce the paperwork required after each Ambulance run and increase efficiency of the Ambulance operations and create a channel to securely communicate information to the hospitals in a timely manner.

YC S14
Rigetti Computing logo

Rigetti Computing

Quantum coherent supercomputing.

Rigetti Computing is building the world’s most powerful computers to help solve humanity’s most pressing and important problems. These systems will perform computations that today’s fastest supercomputers are incapable of — unlocking entirely new classes of problems and offering a direct path to solutions. We are scientists, engineers, builders, and visionaries. We believe quantum computing is going to significantly affect health care, how we treat disease, how we generate energy, and how we feed humanity. Rigetti is the only company deploying full-stack solutions for hybrid classical/quantum computing. Our 19-qubit quantum computer is available online through our Forest platform, and the first commercially useful applications are already under exploration. We were founded in 2013 by Chad Rigetti, and are located Berkeley and Fremont, California.

YC W17
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Riley

MailChimp for SMS

YC S22
Rima AI (formerly Garage) logo

Rima AI (formerly Garage)

AI powered reporting for small businesses

Small business owners use Rima to create professional financial reports that unlock insights to make confident decisions. We are on a mission to create operational freedom for entrepreneurs beginning with eliminating manual reporting forever.

YC X25
Rimba logo

Rimba

AI to replace manual work in environmental compliance reporting

Rimba is building an AI-powered platform to help industrial and energy companies stay compliant with environmental regulations. Legacy systems can’t keep up with today’s complex compliance needs. Rimba offers a platform that integrates data from various software systems—like ERPs, SCADA, Sharepoint—to monitor, report, and verify emissions and other environmental data. Rimba has the capability to parse through PDFs and time-series data at scale while having an AI that continuously learns and predicts outcomes.

YC S21
Rinse logo

Rinse

We're building the One Medical for dental

Rinse is building the One Medical for dental. Beautiful studios, easy to book same day appointments, and anxiety-free care focused on prevention, not the upsell.

YC W21
Rinsed logo

Rinsed

Software to run car washes moving to a monthly subscription model

YC S22
Rio logo

Rio

LATAM’s largest stablecoin FX and liquidity provider

Rio is the premier stablecoin liquidity provider for the LATAM market. We enable access to stablecoins for financial innovators to scale their products.