YC companies
6016
Filtered out of 6018 total.
Tracked monthly visits
19.1B
Visits of active search subset.
Cohort years
2005-2026
Old-to-new timeline ready.
TrafficLens verified
4299
QA blocks fake live claims.
Year
Category
Status
Email Leaderboard
Companies with the strongest mail-channel visit volume and onboarding capture potential.
yc-oss-refresh: YC OSS API mirror of YC Startup Directory
#1
Vidpresso
Mail visits
357.6M
Visits
11.2B
Growth
-2.2%
#2
Reddit
Mail visits
37.6M
Visits
4.17B
Growth
-0.1%
#3
Substack
Mail visits
19.9M
Visits
167.2M
Growth
+1.7%
#4
RecordBook
Mail visits
15.7M
Visits
1.12B
Growth
-0.7%
#5
Dropbox
Mail visits
7.12M
Visits
131.9M
Growth
-4.0%
#6
Airbnb
Mail visits
4.34M
Visits
117.2M
Growth
+8.7%
#7
1000Memories
Mail visits
3.28M
Visits
35.3M
Growth
+7.3%
#8
Stripe
Mail visits
3.26M
Visits
120.8M
Growth
+3.2%
#9
Joy
Mail visits
2.62M
Visits
13.0M
Growth
+16.2%
#10
DoorDash
Mail visits
2.26M
Visits
113.2M
Growth
+7.6%
#11
TypeLess
Mail visits
2.00M
Visits
143.2M
Growth
+1.6%
#12
Tremendous
Mail visits
2.00M
Visits
18.3M
Growth
-0.7%
#13
Clever
Mail visits
1.77M
Visits
33.5M
Growth
-72.5%
#14
FameGame
Mail visits
1.75M
Visits
24.0M
Growth
+0.7%
#15
Instacart
Mail visits
1.60M
Visits
45.7M
Growth
+6.8%
#16
Hive
Mail visits
1.42M
Visits
2.02M
Growth
+23.9%
#17
NudgePad
Mail visits
1.25M
Visits
59.3M
Growth
-1.4%
#18
Groww
Mail visits
1.23M
Visits
55.7M
Growth
-6.5%
#19
Scribd
Mail visits
1.11M
Visits
277.9M
Growth
-7.4%
#20
Gusto
Mail visits
1.09M
Visits
11.3M
Growth
+6.7%
#21
ClassDojo
Mail visits
1.06M
Visits
10.0M
Growth
-49.9%
#22
EasyPost
Mail visits
949.3K
Visits
4.48M
Growth
+14.9%
#23
Razorpay
Mail visits
930.3K
Visits
34.5M
Growth
-6.1%
#24
Prolific
Mail visits
926.3K
Visits
21.1M
Growth
+28.5%
#25
Whatnot
Mail visits
905.7K
Visits
20.6M
Growth
+18.6%
Traffic Distribution
Loyalty = direct traffic share. Email leaderboard = mail traffic share and mail visits. Attention = duration x total visits.
Social Breakouts
Winter 2014Vidpresso
Summer 2005Reddit
Winter 2022RecordBook
Winter 2018Substack
Summer 2006Scribd
The next enrichment pass stores 12-month history and 24-hour deltas once enough daily observations exist.
Debate-It verdict
Build the spine first
The wedge is not a pretty leaderboard. The moat is the YC company graph plus recurring traffic, email onboarding capture, and startup-specific agents that convert observations into reusable execution.
Office-Hours QA gate
Trust in four seconds
Every public number carries a source status. TrafficLens rows graduate from baseline to trafficlens only after live enrichment and autoresearch contract checks pass.
Categorization
Industry, founders, revenue
Filters support industry, sub-category, batch year, founding team, revenue state, active status, and location.
Agent factory
One startup, one agent
Each profile can graduate into a public support agent trained on its site, docs, onboarding emails, and competitive position.