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Slack

Users sign up and disappear

Find your magic number

There's a specific action that separates users who stick around from users who leave. Find it, then get everyone there faster.

ActivationAdvanced
2-4 weeks to find the number, 4-8 weeks to optimize for it

When to use

You have enough users to analyze (1000+) and you're seeing big differences in who stays vs who leaves.

Hypothesis template

If we get users to [specific action] within [timeframe], more of them will stick around because that action is what makes the product click.

Method

The problem: Users sign up, poke around, and disappear. You don't know
what separates the ones who stay from the ones who leave.

What Slack found: Teams that sent 2,000 messages almost never quit. Not 1,000. Not 500. Specifically 2,000.

What they did: Restructured everything around hitting that number. Removed
friction before 2,000, added friction after.

How to find yours:

  1. Look at users who stayed 90+ days vs those who left
  2. What did the stayers do in their first 2 weeks that leavers didn't?
  3. Find the number—not just "sent messages" but "sent HOW MANY"
  4. Test it: if you push users to that action, do more of them stay?

Then redesign around it:

  • Remove every obstacle before users hit the number
  • Add gates (upgrades, advanced features) AFTER
  • Show progress toward the number
  • Nudge users who stall

Success metrics

  • •% of users hitting the number
  • •How fast they get there
  • •Retention: users who hit it vs those who didn't

Prerequisites

  • 6+ months of user data
  • Event tracking in place
  • Someone who can run cohort analysis

Common pitfalls

  • •Confusing correlation with causation
  • •Picking a number that's too hard to hit
  • •Not testing if causing the action actually helps

Source: Slack. Teams hitting 2000 messages had 93% retention.

Suggested ICE scores

10Impact
6Confidence
3Ease
activationretentionanalyticsslack

Ready to run this experiment?

Sign up free to use this playbook with step-by-step guidance and track your results.

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Give Pro free first, then downgrade

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Explore other categories

Acquisition

Get more visitors and sign-ups

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Keep users coming back

Monetization

Increase revenue per user

Referral

Turn users into advocates

Run experiments like a pro

Get experiment suggestions, track results, and learn what works.

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