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YC S13 companies (Summer 2013)

All 52 companies in Y Combinator's Summer 2013 batch, with team size, growth, open roles and funding.

Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.

Hiring the mostlast 60 days
129 roles
DoorDashS13
  1. 2Webflow46
  2. 3Panorama Education9
See all 6
Fastest growingteam, 6 months
+9%
WebflowS13
  1. 2Lob+8%
  2. 3Panorama Education+5%
See all 5
Shrinkingteam, 12 months
−13%
EasyPostS13
  1. 2Estimote, Inc.−10%
Companies
52
Active
10
Hiring, last 60 days
6
Open roles, 60 days
194
People on these teams
88,306
Showing 50 of 52 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
Restaurant delivery.
84,144+3%+8%129$5.2BPost-IPO debt$2.8B, Oct 2026
Professional website design and publishing platform.
1,847+9%+16%46$335MUndisclosed round$400K, Apr 2025
Lob is the only automation platform that transforms direct mail into…
440+8%+14%3$82.3MSeries C$50M, Feb 2021
Improving education for every student.
412+5%+10%9$92.7MSeries C$60M, Sep 2021
The shipping infrastructure of the internet.
347−7%−13%3$88.7MSeries B$25M, Sep 2021
Financial Services for Financial Caregivers.
108+4%+8%4$68.3MSeries B$35M, Jul 2020
Subscription service for women's apparel & accessories.
410%0%0$72MSeries C$9.5M, Nov 2017
Simple Controls for Sonos, Philips Hue and other Smart Home products
38+27%+52%0$6.4MSeed$4M, Mar 2018
We make the world's laws free and understandable.
30−9%−19%0$64.3MSeries C$25M, Jan 2022
Location intelligence platform
19−5%−10%0$14.5MConvertible note$2M, Jun 2019
One Month's affordable online bootcamps teach people how to code in…
17+21%+70%0$2.7MUndisclosed round$1.9M, Aug 2015
Flyer app.
140%−12%0$145KCorporate round$120K, Aug 2019
Meals Delivered in 10 Minutes
120%0%0$13.5MSeries A$11M, May 2014
Cratejoy is the platform for subscriptions
11−8%−15%0$10.8MUndisclosed round$4.5M, May 2015
Legal Operations for corporate legal teams.
100%−9%0$10MSeries A$10M, Jun 2017
Mobile ads that users like. Acquired by Pinterest in May 2016.
7+17%+40%0$15.2MSeries A$12M, Apr 2014
Apptimize lets mobile teams innovate faster to create an amazing user…
7−12%−12%0$18.6MUndisclosed round$12.4M, Oct 2018
Uber for Flowers.
7+40%+40%0$7.7MSeries A$5.5M, Jun 2015
Sourcing marketplace for semiconductor fab spare parts.
50%0%0$1.7MSeed$1M, Mar 2015
Canonical permalinks for songs.
50%0%0$2MSeed$2M, Jul 2014
Bitcoin Marketplace
1  0$1.3MYC investment$250K, Sep 2013
Real-time collaborative editing in the browser with support for…
1  0$120KYC investment$120K, Sep 2013
Amazon Marketplace for Latin America
1  0SeedJun 2013
Acquired by MakerBot in February 2014. A marketplace for 3D…
1  0
7 Cups is an emotional support service that matches up people that…
781  0SeedAug 2013
Dashboard for companies to manage immigration for their employees.
  
  
Banking APIs; acquired by Silicon Valley Bank in August 2015
  
Instant sandboxed server environments
  
Replacing resume screening with code challenges.
  
Open source tools of modern distributed systems.
  
[Now Clara, YC S14- claralabs.com]
  0$120KYC investment$120K, Aug 2013
Mobile communications platform for teams working on live events
  0$120KYC investment$120K, Aug 2013
Graft Concepts makes unique iPhone cases and other mobile accessories
  
A chat program that integrates with email, with presence.
  
Web marketing for SMBs & merchants associations.
  
Augmented reality glasses.
  
Videos of your iOS apps
  
Remote monitoring & activity tracking system for seniors.
  
Direct real estate investing marketplace
  
Payment-as-a-service that helps any business launch payment solutions
  
Audobox is a developer and user friendly tool for in-app feedback.
  
Replacing the paper restaurant menu with an interactive experience at…
  0$120KYC investment$120K, Oct 2013
The best way to communicate with users around downtime.
  0$100KYC investment$100K, Aug 2013
We are a try before you buy service for consumer electronics.
  
We are giving you 20/20 hearing when listening to the devices you…
  
Making sense of social data. (Acquired by SimplyMeasured.)
  0$1.6MSeed$188K, Apr 2015
Git for Documents
  
Weight loss coaching.
  0$120KYC investment$120K, Aug 2013
Marketing people modify site.
  

How this works

1. The roster

Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.

2. The numbers

Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.

3. The lists

Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.

Built with Crustdata. Get your own API key and build your own.

The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.

  • Company search for team size, growth and funding
  • Job search with a count by company, for who is hiring and for what
  • A watch that re-runs the search weekly and sends only what changed
# 1. every company with Y Combinator as an investor
curl https://api.crustdata.com/company/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
    "filters": { "field": "funding.investors",
                 "type": "in", "value": ["Y Combinator"] },
    "fields": ["basic_info.name",
      "headcount.total", "headcount.growth_percent",
      "funding.total_investment_usd"],
    "limit": 100
  }'

# 2. open listings per company, last 60 days (limit 0 = counts only)
curl https://api.crustdata.com/job/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
  "filters": { "op": "and", "conditions": [
    { "field": "company.basic_info.company_id",
      "type": "in", "value": [...] },
    { "field": "metadata.date_added",
      "type": "=>", "value": "2026-08-24" } ]},
  "limit": 0,
  "aggregations": [{ "type": "group_by",
    "field": "company.basic_info.company_id", "agg": "count" }]
}'

# 3. the same company filter as a weekly watch: POST /watch/company/search

Questions about YC S13 companies

How many YC S13 companies are there?

52 companies were in Y Combinator's Summer 2013 batch (S13); 10 are active.

Which YC S13 companies are hiring?

6 companies posted roles in the last 60 days, led by DoorDash (129 roles), Webflow (46 roles) and Panorama Education (9 roles). 3 mark themselves as hiring on YC's directory.

Which YC S13 companies are growing fastest?

By team growth over 6 months (10+ people): Webflow (+9%), Lob (+8%) and Panorama Education (+5%).

Which YC S13 companies raised the most?

No reported rounds after their YC batch in the last 12 months.

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