Twilio

Build apps that communicate
Twilio is a web-service API that lets you use your existing web languages and skills to build voice and SMS applications. We focus on building a simple, powerful, pay-as-you-go communications platform so that you can focus on what you do best.

Shippo

Shipping made easy and cheap.
We've built an API that makes shipping cheap and easy for e-commerce stores. We make shipping cheap by aggregating the shipping volume of our customers and thus get steep discounts from the carriers, which we can pass on to the stores. At the moment we are at ...

Tagplay

Modern Marketing Automation
Tagplay solves the problem of managing multiple platforms online and keeping everything up-to-date. We let you use the social media tools you already know how to use to share to your website, other social media accounts, newsletters or start new multichannel campaigns ...

Stackmob

3scale

Out of the Box API Management Solution
3SCALE provides a comprehensive solution that makes it easy for API creators to package, distribute, manage and monetize APIs to internal and external third parties. 3SCALE's SaaS infrastructure is flexible, secure and web scalable -- enabling the distribution ...

Open Source Syndicate

∑ (valuation increases from our deals) > $1 BILLION
A syndicate that invests in open-source and developer related products.

Runnable

The YouTube of Code
Runnable is building the YouTube of code. Read more about us here Forbes http://www.forbes.com/sites/anthonykosner/2013/10/02/runnable-aims-to-be-the-youtube-of-code-only-with-less-cat-videos/ TechCrunch http://techcrunch.com/2013/10/02/runnable-wants-to-become-the-youtube-of-code/ Wired http://www.wired.com/wiredenterprise/2013/10/runnable/ Gigaom http://gigaom.com/2013/10/02/startup-runnable-fancies-itself-as-the-youtube-of-code/

Singly

Singly provides the fabric for today’s connected apps.
Singly provides the fabric for today’s most connected apps, empowering a new class of developers to create powerful new apps. Using our world class app connection platform, app creators can build remarkable in-app experiences with social integration, auth, data ...

Clearbit

Business Intelligence APIs
We are building a suite of business intelligence APIs to help companies find more information on their customers in order to increase sales and reduce fraud. Our goal is to be the data backbone for modern businesses, powering everything from credit checks to lead ...

Kippt

Evernote for the web
Kippt (YC S12) is a social knowledge management platform. Individuals and companies can collect and share the knowledge they research, and discover new valuable information from the community. The platform is already helping and saving time for wide-range of ...

Opsmatic

Visibility and control for DevOps teams
Opsmatic enables technical teams to move faster with greater confidence by providing configuration monitoring across the entire infrastructure with automated drift detection, policy assertions, search, and a historical timeline to stay on top of all changes. It ...

Mailgun

Modern Email Platform for Developers
APIs that allow developers and their apps to send, receive, track and store emails effortlessly.

CommitChange

Intelligent Software for Nonprofits
We're a revolution, not a company. CommitChange is the future of nonprofit management and philanthropy.

Appbistro

EasyPost

Shipping for Developers
EasyPost is a simple shipping API for developers. Now developers can add shipping from the US Postal Service, FedEx, UPS, and DHL into their apps in minutes. We believe that verifying addresses, checking rates, purchasing postage, and tracking packages should be ...

Zillabyte

Cloud platform for data analysis.
Zillabyte is a cloud platform for data analysis. Build apps, not infrastructure.

Standard Treasury

Building a platform to simplify commercial banking for developers.

Screenleap

Twilio for Screen Sharing (YC W12)
Screenleap allows you to share your screen and view it from any web-enabled device without installing any software. Our mission is to do for screen sharing what Dropbox did for file sharing: make screen sharing a hassle-free experience that just works across all ...

Chain.com

Bitcoin/Blockchain API for Developers
Chain.com is the leading developer platform for bitcoin. Our API makes it easy to build bitcoin applications and services that are reliable and secure. We power wallets, exchanges, remittance services, tipping apps, smart contracts, identity systems, and more.

Chec

Sell anything, anywhere. Stripe/Parse for eCommerce. AngelPad S11.
Chec (AngelPad) is a beautiful decentralized ecommerce platform that is extendable. We're building lego blocks for ecommerce, and letting merchants build whatever they want.

RealityCap

Spatial sensing for mobile devices
We sell a mobile augmented reality (AR) platform. It is built on our patented 6 degree-of-freedom tracking that combines inertial sensing with simultaneous localization and mapping (SLAM) on mobile devices. We are the only AR platform offering SLAM with a deep ...

Plivo

Voice & SMS API Platform. (YC S12)
Plivo is the easiest way to build Voice and SMS applications. We are disrupting the multi-billion dollar market by enabling developers and businesses to build simple, powerful Voice and SMS apps. We abstract the notorious complexity of the telecommunication into ...

Mashape

Mashape is a hub for Cloud APIs.
We make it easy to distribute, monetize, manage and consume cloud APIs. Mashape is building a world-class marketplace for cloud APIs, driven by a passionate community of developers from all over the world. Our mission is to facilitate a new revolution in software ...

Keen IO

Custom Analytics by API
Keen IO is an API platform that lets developers collect and study custom events at a massive scale. An "event" is a pretty broad abstraction, so let's unpack that a bit: Every time someone loads a webpage, clicks a link, draws a breath, takes a step, pauses a ...

awe.sm

Big data infrastructure for social
awe.sm's platform makes it easy for application developers to harness sharing data for business intelligence and data-driven features like gamification, referral rewards, and in-app analytics.

Lob

Print and Mail API (YC S13)
Lob is building a suite of APIs for the enterprise. Built with developers in mind, Lob provides tools that allow businesses to build scalable and powerful applications. The most popular API is a print and mail API that enables companies to send postcards, letters, ...

Bunkr

Business reports made easy. (Bunkr aka The Twilio for Presentations)
PROBLEM: Everyday, professionals create business reports with content & data coming from online platforms. They do screenshots and add them one by one into their presentations. • Laborious to do • Frustrating to keep it updated • Boring to present SOLUTION: "We ...

Balanced

Payments for Marketplaces & Crowdfunding
Balanced is white-labeled payments API and web-based dashboard. Specifically, we offer two products: Balanced Payouts and Balanced Processing, which can be coupled. We really like working with marketplaces and ad networks, but Balanced can be used for any type ...

Conekta

Powering payments for Mexico and LATAM
Conekta helps businesses in Mexico and LATAM accept online payments using credit and debit cards, cash payments, and bank transfers. We offer an API that handles the complications of building a payment gateway such as security, anti-fraud, and scaling. Besides ...

myLanguage

Mobile Language Translation Platform
myLanguage is building a language translation technology platform to help people communicate across language barriers. Our apps have been downloaded over 3.5 million times and have provided over 100 million translations. Offline translation is our #1 feature request, ...

SimpleGeo

Semantics3

Product and Pricing Data for E-Commerce
Semantics3 is building the world's largest database of products and prices. We currently track 46MM products and have over 4 billion prices. All of this data is available in realtime through our Products API. Our customers include developers building data-driven ...

Emergent One

API Generation - We generate REST APIs for existing applications.
We make REST APIs in minutes! Emergent One generates a complete and customized REST API for an existing application. Once the API is created we tailor a personal developer portal, detailed analytics, custom client bindings, and automatically generated documentation. ...

Versal

Versal is a new way for anyone to easily create interactive online courses.
Versal is a new way for anyone to easily create interactive online courses and share them with the world, no coding required. Versal’s platform is free and open to anyone with knowledge and the desire to share it. We’re currently in beta, and there’s much more ...

Crocodoc

Easy document embedding and collaboration using HTML5
Crocodoc converts Microsoft Office and PDF documents to HTML5 so your users can view and collaborate right in your web app. We've developed the world's most advanced web-based document viewing and collaboration technology for Microsoft Office and PDF files, built ...

WorkMob

Better freelance
WorkMob is a company built by freelance developers, for freelance developers. Its founders have been on both sides of the freelance fence. We've been developers who hated the hassle of sourcing work, dealing with mindless projects, and competing with one another ...

AppDirect

The Leading Cloud Service Marketplace & Management Platform
AppDirect's cloud commerce platform is transforming how businesses work, from start to scale. Our award-winning platform empowers companies and organizations of all shapes and sizes to buy and sell business software and cloud services. Businesses can buy enterprise-grade ...

PubNub

A Revolutionary Data Stream Network for Building Massively Scalable Realtime Apps
PubNub is a secure global Data Stream Network (DSN) and easy to use API that enables our customers to connect, scale, and manage realtime applications and IoT devices. With over 70 SDKs for every platform, 250ms worldwide data transfer times, and scalability for ...

Runscope

API debugging and testing tools for app developers. Everything is going to be 200 OK™
Log, monitor and measure your API usage to solve API problems fast. Runscope provides tools for app developers to better understand the impact APIs are having on their application performance. Log traffic from any language or framework to any API to debug problems. ...

Eligible

Stripe for Health Care Transactions - YCS12
Eligible makes it simple for healthcare companies to pass and receive financial transactions with over 1,000 health insurance companies across the country. Transactions include queries to determine patient’s health coverage for certain services, claims (invoice) ...

ReadMe.io

Beautiful documentation made easy. (YC W15)
ReadMe provides every company the ability to easily create beautiful documentation, and build loyal, productive developer communities. With ReadMe, build developer portals that combine support, tutorials, topical guides and API exploration. ReadMe makes it trivial ...

Segment

The World's First Customer Data Hub
Segment is a customer data hub. We let developers install customer data tracking once, and then send their data anywhere they need it. We have libraries for browser javascript, server-side languages, iOS and Android. We process billions of datapoints a month for ...