Slack's North Star Metric
51+-person team · United States · slack.com
Their North Star Metric
Teams at 2,000 messages sent
Reconstructed from public sources. Not officially endorsed by Slack. Request edit
Why this one won
Slack discovered that teams who reached 2,000 total messages almost never churned. That threshold became the activation metric and then the aggregate North Star. Any team past it had crossed the 'we use this for everything' line. Growth equals moving more teams past that threshold.
The Ray
Input metrics that multiply to produce the North Star. Tagged by dimension.
New teams created
Acquisition
Messages per team per week
Depth of use
Integrations connected
Stickiness
Time to first 100 messages
Activation speed
What they considered and rejected
| Metric | Why it was considered | Outcome |
|---|---|---|
| Signups | Too top of funnel | Eliminated |
| DAU | Individual not team | Eliminated |
| Teams at 2000 msgs | Proven retention threshold | Kept |
Lessons learned
The right aha number beats any fancy framework. Look at who churned vs who didn't, find the threshold between them, rally everyone around pushing teams across it.
Related North Stars
Loom
SaaS · 51+ · United States
North Star
Weekly active creators sharing videos
Loom's viral wedge is sharing. A video that's recorded but never shared is a private use case with zero network effect. The weekly active creator metric captures both sides - someone recorded something AND they passed it on - and is the single best predictor of team expansion.
Miro
SaaS · 51+ · Other
North Star
Weekly collaborating teams (2+ users on a board)
Miro solo is a whiteboard tool; Miro multiplayer is a team brain. The weekly collaborating team metric forces the product to focus on the use case that justifies the price: real-time and async team work. Solo boards are fine but they don't retain.
Media · 51+ · United States
North Star
Weekly engaged members (post, comment or message)
LinkedIn's business (recruiting, sales nav, ads) depends on members who actually engage with the network. Passive profile viewers don't generate the data that makes the platform valuable. The weekly engaged member metric filters out ghosts and captures the members whose engagement powers the whole business.
Find your North Star
Run the free 15-minute exercise. AI-guided, no sign-up, no paywall.
Start the exercise - freeAre you Slack? Request takedown