Top 100 YC Companies by

Number of other domains with at least one link to any page on the company's domain. Source: Moz.

Chart Domains Linking for All Companies Chart Domains Linking vs. Other Metrics
Rank Name Batch Category Description Domains Linking
1 Reddit S05 Entertainment The frontpage of the internet. 7,198,010
2 Imgfave S12 Entertainment A fun image sharing community. 910,778
3 Disqus S07 Dev Tools Add comments to your website. 903,163
4 Dropbox S07 Other SaaS Backup and share files in the cloud. 871,984
5 Scribd S06 Entertainment World's largest online library. 595,534
6 Posterous S08 Entertainment Dead simple blogs by email 486,284
7 Twitch W07 Entertainment Video game live streaming 237,392
8 Strikingly W13 Other SaaS The easiest way to create a beautiful, mobile optimized website. 196,222
9 Wufoo W06 Other SaaS Online form builder. 181,980
10 9gag S12 Entertainment Make the world happier. 175,785
11 Airbnb W09 Consumer Book accommodations around the world 141,512
12 Docker S10 Other SaaS App store for server configurations. 112,909
13 Genius S11 Entertainment Crowd-sourced explanations of song lyrics 101,902
14 1000Memories S10 Consumer Memorial sites. 92,109
15 Codecademy S11 Education Codecademy teaches the world the skills they need to get the jobs they want. 86,484
16 Bitnami W13 Other SaaS The App Store for Server Software 84,843
17 ACLU W17 Nonprofit Defender of rights and liberties 83,286
18 GitLab W15 Dev Tools GitLab is the first single application for software development, security, and operations that enables Concurrent DevOps, making the software lifecycle 200% faster and radically improving the speed of business. 69,914
19 MatterPort W12 Entertainment Turn physical objects and environments into 3D models in seconds. 68,195
20 Stripe S09 Fintech Online payments. 66,021
21 Teespring W13 Consumer Retail quality products on-demand. Teespring is a platform that enables anyone to create and sell unique apparel and items that people love, with no cost or risk. 64,054
22 Coinbase S12 Fintech Buy and sell digital currency πŸš€ πŸŒ‘ 60,422
23 Padlet W13 Other SaaS Easiest way to put stuff on the Internet 59,912
24 Heroku W08 Other SaaS Heroku is a multi-language cloud application platform that enables developers to deploy, scale, and manage their applications. 51,012
25 Creative Market W10 Dev Tools Marketplace for ready-to-use design assets from independent creators around the world. Acquired by Autodesk in February 2014. Spun out again in July 2017. 50,832
26 Olark W09 Other SaaS The best live chat software on the planet. We help you build relationships with website visitors, boost sales, and make your customers love you. 46,884
27 Humble Bundle W11 Entertainment Pay what you want for awesome games and other content while giving to charity. 43,626
28 Tech in Asia W15 Entertainment Tech in Asia is a media, events, and jobs platform for Asia’s tech communities. 36,781
29 DailyBooth S09 Entertainment The daily picture taking social network. 34,821
30 Font Awesome S15 Dev Tools Font Awesome makes it easy to add vector icons and social logos to your website. And Pro gives 1,000+ more icons and SVG framework! 34,422
31 The Muse W12 Other SaaS The Muse is the ultimate career destination offering exciting job opportunities, expert advice, and a peek behind the scenes into fantastic companies and career paths. 34,063
32 Webflow S13 Dev Tools Dynamic website builder. 33,964
33 Coub S16 Entertainment Coub is YouTube for video loops. You can take any video from YouTube, Facebook or upload your own. Trim it to the best part, mix it with other videos or add a soundtrack 32,085
34 Zapier S12 Other SaaS Zapier connects thousands of SaaS apps with customizable workflows via an easy to use editor. 29,678
35 Songkick S07 Consumer Songkick is a ticketing vendor and online database of concerts for music enthusiasts. 28,923
36 Product Hunt S14 Entertainment Hacker News for Products 28,591
37 Project Wedding W06 Consumer Finding wedding vendors is hard. In 2007, a couple started Project Wedding to tackle this problem and eventually grew it into a 24,687
38 Authy W12 Dev Tools Authy is a Two-Factor Authentication platform for developers 22,427
39 Mixpanel S09 Other SaaS Mixpanel is the most advanced analytics platform in the world for mobile & web. 21,196
40 Optimizely W10 Dev Tools A/B testing. 20,003
41 Svbtle S12 Entertainment Curated blog network 18,749
42 Our World in Data W19 Education Open access research and data visualization on global development 15,966
43 RescueTime W08 Other SaaS RescueTime is a web-based time management tool that tracks the activities and duration of a users' computer usage. 15,762
44 SmartAsset S12 Fintech The easiest way to make and understand important personal finance decisions. 15,121
45 Lanyrd W11 Consumer IMDB of conferences. 14,628
46 Ninite W08 Other SaaS Simple third-party app patching and deployment for Windows. 14,268
47 Submittable S12 Dev Tools Submittable is the best way for organizations to create, promote, and manage their calls for submissions, applications and other opportunities. 14,013
48 Priceonomics W12 Other SaaS We help companies turn their data into great stories. 13,696
49 DoorDash S13 Consumer Restaurant delivery. 13,619
50 HackerRank S11 Other SaaS Programmer IQ 12,642
51 Embedly W10 Dev Tools Embedly helps publishers and consumers manage embed codes from more than hundred websites and APIs. 12,313
52 Hipmunk S10 Consumer Hipmunk takes the agony out of searching for flights, accommodations, cars, and more. 12,269
53 Listia S09 Consumer Mobile marketplace for trading used goods. 11,479
54 Shoptiques W12 Consumer Shoptiques.com lets you shop the world's best local boutiques online. 11,367
55 Instacart S12 Consumer Groceries delivered fast. 11,355
56 Weebly W07 Other SaaS Web site editing platform. Over 40M people have launched their business on Weebly and every month 325M people visit a Weebly-made site, or 50% of the US. 11,207
57 OpenAI S16 Dev Tools OpenAI is a non-profit artificial intelligence (AI) research company. 10,678
58 Vidyard S11 Other SaaS YouTube for business. 10,670
59 LendEDU W16 Education LendEDU is a marketplace for consumer financial products. 10,436
60 inDinero S10 Other SaaS Financial dashboard for businesses. 10,037
61 Posthaven S05 Entertainment Blogging forever 9,988
62 The Athletic S16 Entertainment Subscription sports media. 9,937
63 Poll Everywhere S08 Other SaaS Live audience feedback 9,857
64 Vayable S12 Consumer We're building a marketplace for unique travel experiences (it's AirBnB for the part of your vacation when you're not sleeping). 9,790
65 Lever S12 Other SaaS Lever is an Applicant Tracking System + Talent CRM. It effortlessly fits the hiring needs of companies today. 9,637
66 WePay S09 Fintech Payments for platform businesses. 9,452
67 Couple W12 Entertainment App that connects two phones and creates a private timeline to share things with your girlfriend/boyfriend. It's somewhere between a Facebook timeline for your relationship, and SMS, so you have a more personal way to communicate. 9,412
68 NewsBlur S12 Entertainment NewsBlur is a personal news reader that brings people together to talk about the world. A new sound of an old instrument. 9,059
69 Casetext S13 Other SaaS We make the world's laws free and understandable. 8,617
70 GoCardless S11 Fintech Replace credit cards online. 8,604
71 Mailgun W11 Dev Tools Email API service. 8,470
72 BuildZoom W13 Consumer BuildZoom is a better way to remodel. We connect homeowners to the most reliable general contractors in their area and make remodeling simpler, cheaper and more predictable. 8,218
73 ReadMe W15 Dev Tools ReadMe provides every company the ability to quickly and easily create beautiful documentation, and build loyal and productive developer communities. 8,206
74 Octopart W07 Industrial Octopart is a search engine for electronic components 7,829
75 Cratejoy S13 Other SaaS Cratejoy is the platform for subscriptions 7,688
76 CoreOS S13 Other SaaS Enterprise Linux distribution that dramatically improves security and speed of application deployment. 7,574
77 InfluxData W13 Other SaaS InfluxData is building the platform for collecting, storing, visualizing, and processing time series data at scale. 7,485
78 StatusPage S13 Dev Tools The best way to communicate with users around downtime. 7,442
79 CircuitLab W13 Dev Tools Browser-based electronics simulations and schematics software. 7,321
80 Parse S11 Dev Tools Parse is the easiest way to build apps. 7,306
81 Women.com S14 Entertainment Quora/Cosmo for women 7,184
82 Algolia W14 Dev Tools With 50 data centers in 15 regions, Algolia offers a developer-friendly and enterprise-grade search API. Designed to make every search interaction meaningful and rewarding, Algolia serves billions of queries weekly for more than 5,000 customers. 7,174
83 Segment S11 Other SaaS Segment is the analytics infrastructure that helps collect and organize data so businesses make better decisions. 7,169
84 YourMechanic W12 Consumer Car Repairs, Reinvented: a. Mechanic comes to your home or work to fix your car b. Save 20-30% by working directly with mechanics instead of shops c. Total transparency and money back guarantee 7,114
85 CodeCombat W14 Education Game that teaches computer science to middle and high school kids. 6,998
86 Tilt W12 Fintech Mobile crowdfunding: The easiest way to collect, fundraise, and sell with your community. 6,953
87 Heyzap W09 Entertainment Heyzap (acquired by Fyber for $45m in 2016) is one of the largest mobile mediation providers. 6,908
88 Gusto W12 Other SaaS Humans aren’t resources. Gusto reimagines payroll, benefits, and HR by automating the most complicated, impersonal business tasks and making them simple and delightful. Get three months free @ https://gusto.com/friends/y-combinator 6,895
89 Memebox W14 Consumer Full Stack Beauty Ecommerce 6,634
90 Platzi W15 Education Live streaming classes on design, marketing and code. Learn from industry leaders. 6,629
91 PushBullet W14 Consumer Push things to your other things. 6,616
92 Recurious W09 Entertainment thesixtyone is a music discovery game that connects artists and fans. 6,581
93 OwnLocal W10 Other SaaS OwnLocal automates marketing for over 129,000 SMBs through 3,300 local media partners in North America, Australia and UK. 6,549
94 Vote.org S16 Nonprofit Vote.org uses technology to simplify political engagement, increase voter turnout, and strengthen American democracy. 6,434
95 Clever S12 Education Developing applications for education is a data nightmare. Clever's APIs make building on top of student data easy for developers. 6,333
96 WorkFlowy S10 Other SaaS WorkFlowy is a better way to manage information. It provides a simple mechanism - zoomable, searchable, shareable bulleted lists - that has startling versatility and power. 6,202
97 Splashup S07 Entertainment Splashup is a web-based image editor that integrates with Flickr, Facebook and Picasa. 6,177
98 Soylent S12 Consumer Soylent is a simple, nutritious, and affordable food that possesses all the essential ingredients a body needs to be healthy. 6,162
99 Crocodoc W10 Dev Tools Crocodoc allows developers to embed high-fidelity PDFs, PowerPoints, and other documents into their web and mobile apps. To date we've processed > 1 billion documents for customers including LinkedIn and Dropbox. We were acquired by Box in 2013. 6,146
100 Heap W13 Other SaaS Heap automatically captures every user interaction in your mobile or web app, letting you generate analytics without writing code or waiting for data. 6,047