βΆWeek 1 retention vs Day 30 β why does Week 1 matter so much?
Week 1 retention is the strongest signal of long-term success because users who don't activate in the first week almost never return. If 40% of users activate in Week 1, you're fighting an uphill battle trying to re-engage the 60%. Focus: map your 'aha moment' (the core value experience that hooks users), then optimize onboarding flows to reach it by Day 3. Example: Slack's aha = sending/receiving first message; Linear's = creating first issue. Measure activation separately from retention. Get Day 7 retention to >50% before scaling acquisition spend.
βΆChurn cohort analysis β how do I identify why users are leaving?
Cohort churn analysis segments users by signup date (monthly or weekly cohorts) and tracks retention curves. Plot: x-axis = days/weeks since signup, y-axis = % of cohort still active. Compare curves across cohorts, features, or user segments. Churn spike on Day 30? β Investigate trial expirations, onboarding completion rates, or feature access blockers. Flat 80% retention week 2-8 then cliff week 9? β Investigate seasonal patterns, competitor launches, or plan changes. Use Mixpanel/Amplitude cohort reports; drill into cohorts with worst curves, segment by signups-source/device/plan, identify commonalities. High-churn cohort often reveals a broken flow or messaging issue.
βΆNegative churn vs expansion revenue β are they the same thing?
Negative churn = overall MRR decreases slower than customer count decreases (or increases) due to upsells/expansions. Expansion revenue = revenue from existing customers (upsells, cross-sells, seat expansion). Related but distinct: a company can have positive churn (losing customers faster than upsells offset) but still have high expansion revenue. Negative churn is the holy grail because: (1) payback period disappears, (2) CAC gets financed by expansion, (3) unit economics improve with scale. For SaaS: target -5% monthly churn or better. For marketplaces/B2C subscriptions: positive churn is often baseline; focus on aggressive re-engagement to hold Month 3 retention at >40%.
βΆReactivation campaigns (win-back) β what's the ROI cutoff?
Win-back emails to lapsed users (30+ days inactive) typically ROI 2-5x, but only if personalized. Send generic 'we miss you' to 50% of lapsed β 0.5% response rate ($0.01 CPE). Segment by last action taken (upgrade? Feature X? Nothing?), reference that moment, offer relevant incentive. Example: inactive-for-2-months user who tried Feature X β '3-month free trial of Pro. Feature X is now 10x faster.' Reactivation ROI breaks down beyond 90 days lapsed (too cold). Budget: only reactivate 20% of customers (top-value lapsed). Bigger win: fix onboarding so fewer users lapse in the first place.
βΆHealth scoring β how do I predict which accounts will churn?
Health score = weighted composite of leading churn indicators. Example SaaS health score: (logins per week Γ 0.3) + (features used per week Γ 0.25) + (days since support ticket Γ 0.2) + (plan tier Γ 0.15) + (contract renewal date Γ 0.1). Low scoring <40 = high-churn risk. Build: identify 5-7 behavioral metrics that correlate with churn in your historical data (use logistic regression or tree model). Weight by predictive power. Update daily. Alert CSM when health drops >10 points in a week. Prediction window: 30-60 days. This enables proactive intervention (outreach, feature training, upsell to prevent downgrade) vs reactive recovery. Tools: Gainsight, ChartMogul, or custom Mixpanel cohort SQL.
βΆHabit loops (trigger, action, reward) β how do I design them into the product?
Habit loop = consistent context (trigger) β easy action β satisfying reward β desire for repeat. Examples: LinkedIn notification (trigger) β tap notification β social validation + engagement count (reward). Strava weekly summary (trigger) β app open β personal achievement visualized (reward). Design: (1) Choose one core action you want habit-forming (not everything, focus is power). For Slack: sending message. For fitness app: log workout. (2) Make the trigger contextual: email, push notification, time-based, or social. (3) Remove friction from the action: 2-tap maximum. (4) Reward should satisfy the core motivation (social, achievement, utility, etc.). Timing: daily habits need daily trigger. Weekly habits need weekly reminder. Avoid over-triggering (notification fatigue kills habit). Measure: % of users taking the action 5+ days per week = habit formation signal.
βΆRetention metrics dashboard β what should I monitor daily?
Core 5: (1) DAU/WAU/MAU trends (are users coming back?). (2) Day 1/7/30 cohort retention curves (how sticky is the product?). (3) Churn rate by plan (does premium churn differently?). (4) Feature adoption per user segment (are new features driving retention?). (5) Win-back ROI (is reactivation working?). Secondary (weekly): cohort churn analysis, health score distribution, upsell/expansion rate, NPS trends. Avoid vanity metrics: total signups, DAU absolute numbers (focus on % growth or retention %). Red line: if Day 7 retention <50%, acquisition spend is wasted. Setup: Looker + Mixpanel or Amplitude, not spreadsheets. Automate cohort calculations so you always have 90 days of data rolling. Alert on drop >5% in any core metric.