Nov 13, 2025 08:45:06 AM

Companies


Showing 251-275 of 5661 companies
YC S11
Apollo logo

Apollo

Apollo helps engineering teams accelerate delivery

Apollo GraphQL is the leader in open source and commercial GraphQL technologies. Apollo’s open-source GraphQL client, server, and gateway are downloaded more than 17M times per month and used in production by over 30% of the Fortune 500. Customers like Walmart, Expedia, Glassdoor, Audi, and PayPal, use the Apollo Graph Platform to unify their GraphQL efforts, collaborate on graph development, and safely iterate on their graphs. Based in San Francisco, Apollo is backed by Insight Partners, Andreessen Horowitz, Matrix Partners, Trinity Ventures, Y Combinator and individual investors.

YC S15
A

Apollo Health

YC W16
Apollo.io logo

Apollo.io

Apollo is the foundation of your entire go-to-market strategy.

Founded in 2015, Apollo.io is a lead intelligence and sales engagement platform trusted by nearly 9,000 paying customers, from rapidly growing startups to some of the largest global enterprises. Our community-based approach to crowdsourcing data gives users maximum coverage while ensuring data accuracy. Our advanced algorithms and unique data acquisition methods help over 500,000 sales professionals enrich and analyze prospects' data to increase quality conversations and opportunities. We have notable investors: Y Combinator and Nexus Venture Partners. We recently completed a Series B financing to fuel our next growth phase. We have reached and maintained profitability for the last 18 months. Our growth and customer feedback set us apart from competitors. Apollo had over one million sign-ups for its platform in the past year, and the number of weekly active users increased by over 400%. We are a top-ranking G2 Crowd vendor in the Sales Intelligence, Lead Intelligence, Marketing Account Intelligence, and Sales Engagement categories. Our highest scores are in the B2B data space for accuracy and ROI based on customer reviews.

YC S16
ApolloShield logo

ApolloShield

ApolloShield is a system that detects unwanted drones and drives them…

Detect and safely block unwanted drone intrusions. Track down and arrest unauthorized operators. Developed by experts from Israel Defense Forces and currently serving more than 25 countries, ApolloShield is the world leader in detecting and blocking drone intrusions, as well as tracking down and arresting unauthorized drone operators.

YC S23
Apoxy logo

Apoxy

Simpler and cheaper multi-cloud and cross-platform deployments.

Apoxy is the programmable edge platform that simplifies connectivity, security, and custom logic deployment for distributed applications. Our platform combines secure site-to-site networking with a high-performance runtime for custom TypeScript and Go filters, allowing developers to deploy business logic at the edge without complex infrastructure. Whether you need instant HTTP/TCP/UDP connectivity, advanced access controls, or custom data processing, Apoxy meets you where you are - from Kubernetes clusters to simple processes - with powerful observability and sub-second troubleshooting built in.

YC W17
Apozy logo

Apozy

Apozy makes every website safe to browse

Apozy is a browser defense platform powered by "Native Browser Isolation" technology. It neutralizes phishing, malware, and impersonation attacks in real-time by sandboxing dangerous websites at the time of click. This creates a safe "read-only" environment for browsing, even if the original website is malicious. Businesses use Apozy Airlock to protect their employees from online threats and prevent data breaches.

YC W11
A

AppHarbor

.NET Cloud Platform as a Service

AppHarbor is a .NET Platform-as-a-Service. Developers push code to AppHarbor using either Git or Mercurial. AppHarbor then builds the code and runs any unit tests. If everything checks out, the code is deployed to AppHarbor's scalable cloud platform. AppHarbor lets developers spend their time coming up with ideas and developing applications, not patching servers, worrying about deployment, messing with configuration files, or scaling. At AppHarbor, we believe that developing and deploying .NET application should be simple and fun. AppHarbor has been designed to tie in with developers day-to-day workflows. Deploying a new version to AppHarbor is as simple as checking in code when a new feature is ready. AppHarbor will run most ASP.NET applications without modification. Moving an application to our platform requires no AppHarbor-specific code modifications nor installation of plugins or other custom software. We believe developers should be able to move applications and data to different cloud-vendors with as little friction as possible. AppHarbor believes in giving developers access to an open ecosystem of addons and 3rd party services, not just the ones we decide to provide ourselves.

YC S21
AppX logo

AppX

AppX helps social media creators launch their own mobile apps.

AppX empowers creators to launch their personal apps and websites to monetise their audience via courses and premium exclusive content.

YC S15
Appcanary logo

Appcanary

Appcanary tracks the dependencies you use in your apps and servers…

Never run vulnerable software again. We monitor your servers, and notify you when you need to update. Try us for free: https://appcanary.com

YC W13
A

Appcubator

The easiest way to prototype web applications.

Appcubator has launched to allow users to create their own web applications with drag and drop, text inserts and custom themes, rather than having to endure the arduous process of learning to create a full-functioning website or hire a contractor.

YC S07
A

Appjet

Y Combinator funded AppJet is an online programming tool for building simple web apps. Founded by former MIT students, AppJet intends to simplify the process of writing web applications. The applications are programmed on a web based text editor in the simple but powerful JavaScript programming language. JavaScript is used on both the server and client side. They've included several bundles of code libraries for databases and more importantly interfacing with the Facebook API. In order to efficiently host users' applications, AppJet has developed their own application virtualization system. The system allocates processor time to active applications and cuts off greedy ones after running an alloted number of compiled lines of code to prevent abuse. AppJet as a dev platform seems no longer to be active. There are some legacy downloads available, however.

YC S22
Apply Design logo

Apply Design

Helping realtors showcase the full potential of their properties

Apply Design is a leading AI-powered virtual staging app that empowers real estate professionals to showcase the full potential of their properties to prospective buyers, helping them sell homes faster and for higher prices. We virtually stage over 10,000 properties monthly, transforming images of vacant or outdated spaces into fully furnished, captivating property photos. Our proprietary AI-powered software is the only solution capable of generating photorealistic designs in one click while also enabling instant customization of any detail with complete control. This is a $10B market opportunity, given the 50M properties sold or rented annually in North America and Europe alone.

YC W11
A

Apportable

iOS porting

Apportable allows developers to cross-compile Objective-C apps to Android, without maintaining a separate code base in Java. It is used by many top-rated iOS games like Kingdom Rush and Osmos to deploy to Android stores using their existing Objective-C or C++ code.

YC S18
Apprentice Health logo

Apprentice Health

We deploy sensors and software that increase hospital efficiency.

We deploy location beacons to track the movements of patients and doctors, measure the inefficiencies in the doctors’ workflows, and then give the hospitals targeted recommendations on how to improve.

YC X25
Approval AI logo

Approval AI

One-click mortgage: AI shops, negotiates, and handles your application

Approval AI is an AI-powered mortgage co-pilot that automates the most complex parts of getting a mortgage: rate shopping, negotiation, and paperwork, all in one place. We automate what brokers and loan officers do, and hand those tools directly to the buyer.

YC S13
Apptimize logo

Apptimize

Apptimize lets mobile teams innovate faster to create an amazing user…

Apptimize enables organizations to enhance their native iOS and Android apps to create amazing user experiences, improving acquisition, engagement, and retention. We do this with a platform that empowers product teams to efficiently run A/B tests, make instant updates, and personalize user experiences through staged and segmented rollouts. Apptimize, based in San Francisco, is backed by US Venture Partners, Google Ventures, Y Combinator, and others. Top apps including The Wall Street Journal, Vevo, HotelTonight, and Strava use Apptimize to continuously drive mobile growth.

YC S25
April logo

April

Voice AI Executive Assistant

April is a voice AI Executive assistant that manages your email and calendar, hands free. It’s built for busy individuals who need EAs but don’t have them.

YC W14
AptDeco logo

AptDeco

AptDeco is the easiest way to buy and sell used furniture

AptDeco is a peer-to-peer managed marketplace dedicated for buying and selling quality used furniture. We offer a complete end-to-end process to bring back the joy of discovering amazing furniture finds for the home again. Our customers benefit from a trusted and verified community of buyers and sellers, pre-arranged pick up and delivery and a secure electronic payment process.

YC S24
Apten logo

Apten

Omnichannel AI agents that engage leads across SMS, voice, and email

Apten is an omni-channel AI agent that engages and nurtures leads across text, call, email, and webchat. We help enterprises in consumer services convert more leads.

YC S14
Aptible logo

Aptible

The No Infrastructure Platform as a Service

At Aptible, we envision a world where developers achieve more with less infrastructure. We’re building the platform that empowers developers at companies of all stages of development to move beyond the traditional method of managing infrastructure—DIY with expert infrastructure and platform engineers on AWS, GCP, or Azure. We’ve done this through our secure, compliant, reliable, and scalable Platform as a Service that’s been used by thousand of developers, hundreds of companies, and dozens of publicly traded and unicorn companies since 2013.

YC S14
Apto Payments logo

Apto Payments

API platform for partners to issue branded debit and credit cards to…

Apto Payments provides a white-label, turnkey solution to launch innovative, user-first, card programs. Our technology empowers our customers to issue Visa and Mastercard, physical and virtual, card programs. We have both a developer-first, Instant Issuance Platform, as well as an enterprise solution for bespoke opportunities.

YC S19
Apurata logo

Apurata

Point of sale financing for Latin America's middle class.

We offer instant underwriting of financing at the point of sale (ecommerce or physical) focused on small purchases ($100-$1000).

YC S21
Aqua logo

Aqua

The Operating System for Alternative Investments

One stop shop to find, invest, and service an alternative investment for RIAs, IBDs, and institutions.

YC W24
Aqua Voice logo

Aqua Voice

Talk into any text box - write 4x faster than typing.

Super fast AI dictation that lets you talk into any text field -- Cursor, Gmail, Slack, even your terminal. It starts up in under 50ms, inserts text as fast as 450ms, and has state-of-the-art accuracy. Write 4x faster anywhere with Aqua. 🌊

YC S20
Aquarium Learning logo

Aquarium Learning

We help ML teams improve their models by improving their datasets

ML models are only as good as the datasets they're trained on, and that means that most improvement to model performance comes from improvement to the quality and diversity of their datasets. Our tooling makes it easy for ML teams to find anomalies + failure patterns in their datasets and fix these problems by editing / adding the right data. So the next time you retrain your model, it just gets better.