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The Y Combinator Top companies stack
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Productivity & Collaboration
All Productivity & Collaboration tools
44
tools · used by
32 of 74
companies · updated Sep 2026
All
Business Phone Systems
Project Management
Team Collaboration
Video Conferencing
Knowledge Management
Team Messaging
Document Management
Scheduling & Calendar
Note-taking Tools
Workflow Automation
Office Productivity
All
Business Phone Systems
Project Management
Team Collaboration
Video Conferencing
Knowledge Management
Team Messaging
Document Management
Scheduling & Calendar
Note-taking Tools
Workflow Automation
Office Productivity
10 shown
01
Jira
7%
· 5
02
Confluence
5%
· 4
03
Grain
5%
· 4
04
Notion
5%
· 4
05
Slack
5%
· 4
06
Zapier
5%
· 4
07
Align
4%
· 3
08
Atlassian
4%
· 3
09
FO
Focus
4%
· 3
10
Granola
4%
· 3
All Productivity & Collaboration tools used by the Y Combinator Top companies | Soft Atlas