Nov 18, 2025 08:06:40 PM

Companies


Showing 3926-3950 of 5661 companies
YC W25
Red Barn Robotics logo

Red Barn Robotics

A Roomba for weeds on a farm.

We are building an autonomous robot to precisely eliminate weeds and leave crops untouched. Despite $100 billion being spent annually on weed control, weeds still cost the US economy $46B/year. Weeds steal sunlight and nutrients from crops, forcing farmers to choose between higher costs and lower yields. Moreover, many farms still rely on hand labor to control weed growth. The process is slow, expensive, and increasingly difficult due to constant labor shortages (1 out of every 5 US farm positions go unfilled each year). Our robot nicknamed the Field Hand is able to automate one of the worst jobs on a farm and will help healthily feed the world.

YC W22
RedBrick AI logo

RedBrick AI

Rapid medical data annotation

RedBrick AI's mission is to accelerate the adoption of artificial intelligence in radiology by building world-class software infrastructure. Currently, we are focused on helping radiology AI teams prepare high-quality datasets to train their algorithms. Radiology data, such as CT and X-ray scans, is an incredibly important source of truth in healthcare delivery. In fact, over 90% of all healthcare data is medical imagery! However, the global radiology workforce is overburdened. In the UK, for example, only 2% of radiology departments are able to fulfill their reporting requirements, and this trend is reflected worldwide. The acute state of radiology, coupled with the abundance of data, makes the use of AI in radiology a prime candidate. In 2022, $5.6 billion was invested in the development of AI in healthcare! However, a key hindrance to further adoption is the lack of sophisticated tools to build and deploy AI algorithms in clinical environments. This is the problem we’re focused on at RedBrick AI We're a team based out of Bangalore India, and USA. We're backed by leading institutional investors like Y Combinator and Peak XV (formerly Sequoia Capital India).

YC S15
RedCarpetUp logo

RedCarpetUp

Credit cards for Indians that banks cannot see

RedCarpet issues credit cards to those that banks cannot see. Currently we are one of the largest issuers of credit lines to the new-to-credit customer in India. In a population base of 800 million people with bank accounts, there are less than 40 million credit cards. By building a fullstack SDK for card issuance, underwriting as well as holding capital & collection ops, we are looking to build the Capital One of India.

YC F25
Redapto logo

Redapto

Self-improving systems for Customer Support Teams

Redapto builds self-improving systems for customer support teams that boost CSAT, NRR, and drive repeat purchases. Support quality plateau because agents and QA are static. Less than 5% of interactions are reviewed, missing SOP gaps, hallucinations, and outdated knowledge. Redapto audits 100% of interactions to detect issues, run custom evals, and auto-update SOPs, training, and knowledge bases so teams continuously improve. We’re applied researchers who’ve shipped this at scale. At Coinbase, our agent automations save $2.5M+ annually; at Adobe and Amazon, our post-training and compression work saved $1M+ and improved latency 20×.

YC S21
Redbean logo

Redbean

Make games and stories with AI

YC W22
Redbird logo

Redbird

AI-powered Analytics Platform

Redbird is an AI-powered analytics platform for the enterprise - empowering anyone within an organization to easily automate and unify their analytics work in minutes, without writing code. Redbird connects to all of an organization’s data sources and accelerates analytics work across data prep, wrangling, analysis, reporting and data science.

YC W21
Redcliffe Lifetech logo

Redcliffe Lifetech

Redcliffe Labs is India's Largest Omni-channel Diagnostics platform

Redcliffe Labs (a unit of Redcliffe Lifetech Inc) provides diagnostics with a comprehensive portfolio approach both with routine and specialised test menus with advanced testing labs all over India. Its digital first approach with on-demand 1-hour home collection and same day report is disrupting the way diagnostics is delivered today and thus is the fastest growing in India. Redcliffe Labs is providing 3500+ tests across its wide network of labs and collection centres. The company has served about millions of Indians and is processing more than 250K+ test parameters daily. The test portfolio is very wide including routine pathology tests, advanced genetic screening, research-based DNA tests in reproductive health, cancer and wellness/fitness. The easy to interpret smart reports provide key health check-points, which can help in diagnosing and treating both chronic and acute diseases on time. Redcliffe Labs has pioneered Drone technology adoption in the diagnostic sector by opening up the first commercial corridor from Uttarkashi to Dehradun. The company currently has 30+ labs and 700+ authorised collection centres in more than 120 cities across India. Redcliffe's vision is to provide world-class diagnostic services to people across the Indian sub-continent in an affordable manner.

YC S05
Reddit logo

Reddit

The frontpage of the internet.

Founded by Steve Huffman and Alexis Ohanian in 2005, Reddit is an online community where users submit, vote, and comment on content, news, and discussions. Nicknamed "the front page of the internet,"​ Reddit is one of the top ten sites in the United States (source: Alexa), with hundreds of millions of users each month on desktop, mobile web, and our official Android/iOS apps. Interested in joining our growing team? Check out about.reddit.com/careers

YC W25
Reditus Space logo

Reditus Space

Reusable Satellites for zero-g manufacturing

We are making reusable satellites for zero-g manufacturing. Our first full orbital recovery mission is set to launch in April 2026.

YC S24
Redouble AI logo

Redouble AI

Scale human-in-the-loop for AI workflows in regulated industries

Redouble AI is the solution to scale human-in-the-loop for AI workflows in regulated industries. Instead of having to rely on slow and expensive human reviewers, Redouble’s clients save 80% of staff costs and significantly improve the accuracy and quality of their outputs by integrating our tool into their workflows. Addressing an $11BN market, the company is already generating revenue with its first set of clients. The founders are two serial entrepreneurs (who have built successful companies in AI and health-tech respectively) and a data engineering veteran who has written more than 120 enterprise-grade software applications.

YC W16
Redspread logo

Redspread

Version control for software environments

Redspread is a collaborative deployment tool for managing environments from development to production. It enables the deployment of Docker projects to a Kubernetes cluster using a single command. Redspread was launched in 2015 and is based in San Francisco, California.

YC S15
R

Reduced Energy Microsystems

Building the lowest-power silicon for embedded deep learning and…

Reduced Energy Microsystems is building the most power-efficient silicon for embedded computer vision to bring visual intelligence to a whole new range of devices. By combining proprietary asynchronous resilient technology with a custom neural network architecture, REM chips will handle state-of-the-art inference and traditional vision workloads in a tiny power envelope. REM makes augmented reality, body-worn cameras, and autonomous robots smarter than ever before.

YC W24
Reducto logo

Reducto

The most accurate API to parse documents

Reducto offers robust and reliable document ingestion for any workflow. Our API allows you to convert complex, unstructured documents into structured outputs that are perfect for RAG, process automation, and more.

YC S13
R

Reebee

Flyer app.

Reebee is the best way to browse and distribute flyers. The reebee mobile application makes it easy for customers to browse and discover local flyers, stay organized with an integrated shopping list, search products and much more. Available for free in Canada on the Apple App Store, Google Play, and BlackBerry World. Reebee specializes in targeted flyer distribution, engaging the consumer audience through a rich mobile experience. Digital distribution not only fills in the voids of physical distribution, but it also reaches a new audience with distinctly measurable results. Track consumer buying signals like never before.

YC S16
R

Reebeez

Reebeez creates powerful microengines for UAVs. With a 2hr + flight…

Reebeez develops efficient solid-state thermoelectrophotovoltaic microengines for UAVs that achieve flight times and payloads unrivaled by batteries and fuel cells. Due to weight limitations of engines, small aerial vehicles must rely on lithium polymer batteries that result in disappointing flight times and payloads. Reebeez presents a propulsion ​system powered by thermoelectrophotovoltaics (TEPV) that runs on lightweight combustible fuels to attain specific energy eight times better than lithium polymer batteries - at a third of the cost.

YC S12
R

ReelSurfer

Clip and share any video from any website.

ReelSurfer lets anyone clip and share any video from any website. The vision is to build the most valuable content network on the planet – created by personal libraries of short, relevant videos that are saved, watched and shared with friends.

YC W19
Reelables logo

Reelables

The Future of Supply Chain Data Tracking and Visibility

a16z SR003
Refactor Games logo

Refactor Games

Next-generation sports video games

Based in Santa Monica, CA. We are the creators of action packed next-generation sports video games. Our Sports Physics Engine creates new unique animations every frame, so that every play is different. Our games are cross-platform, penetrating 100% of the video game market. We have well established relationships with every sports license holder and every major video game platform or distributor. It is our mission to expand the sports video game market and to bring exceptional returns to shareholders, platforms, leagues, athletes and game developers.

YC W22
RefineTrain AI logo

RefineTrain AI

AI agents rewriting & optimising your internal documentation for LLMs

We rewrite and optimise your internal documentation for AI, giving it deep enterprise context. This unlocks substantially better LLM results across all AI workflows. PROBLEM: -------------- • AI teams struggle with LLM accuracy building AI workflows and agents because of messy, conflicting, fragmented internal knowledge. • Internal knowledge conflicts, uses undefined jargon and rely on unstated company assumptions & context. • LLMs are like Day 0 fresh hires – they can’t understand this documentation properly without someone explaining context to them. • Furthermore, vector search suffers from poorer retrieval accuracy when company context and terms are not present in a knowledge article WHAT WE DO ------------------- • Clean & De-Conflict: Our AI agents read every doc, resolve contradictions, and builds content relationships. • Context Distillation: Our AI agents read & compare related docs, distills context and rewrites an LLM-optimised version of your internal documentation. Optional human-approval ensures 100% confidence in the output. THE OUTCOME ---------------------- • Agents and chatbots that actually understand your enterprise context. • Retrieval that delivers precise, policy-aligned answers on the first try. • A living knowledge base that stays synchronized with every new doc revision.

YC S20
Reflect logo

Reflect

No-code test automation for web apps

Reflect is a no-code tool for automated website testing. Instead of building and maintaining complex Selenium tests, companies use Reflect to run automated end-to-end tests without writing code.

YC W23
Reflex logo

Reflex

Reflex is an AI app builder for creating production-grade web apps…

Reflex is an AI app builder for creating production-grade web apps entirely in Python, powered by its own open-source framework. Python is one of the most popular programming languages in the world, and web development is one of the most popular applications of programming. So why can’t we make full-stack web apps using just Python? With Reflex, you just connect your data and enter a prompt. It generates production-ready apps that integrate any data source, API, or Python package. Founded by Nikhil Rao and Alek Petuskey, Reflex has over 1 million apps created, 27k GitHub stars, and has been used by 30% of Fortune 500 companies for internal tools and data-driven applications.

YC W22
Reforged Labs logo

Reforged Labs

Turn intuition into insights, in minutes

Reforged Labs Boa is the AI creative intelligence agent that answers all your questions about what ads are performing, why they work, and what to create next.

YC W24
Reform logo

Reform

Workflow automation. Built for logistics.

Automate freight operations from quote to cash without replacing your trusted systems.

YC S21
Reframe (Glucobit) logo

Reframe (Glucobit)

App to help people quit or cut back on alcohol use

Reframe is the leading app to help people cut back on drinking. Reframe uses neuroscience & psychology to help people shift the way they think about drinking & help build great habits. We don't believe in stigma or restrictions. In the past 12 months, Reframe has had over 2M+ users and has helped more people cut back on alcohol use than any other org worldwide.

YC X25
Refresh logo

Refresh

RL environments for computer use and software engineering work

Building RL environments for the next generation of capabilities in frontier models.