User Retention

Apply Kahneman's loss aversion and Lally's 66-day habit formation to increase D7 retention 35-50% and reduce churn 67%. Behavioral science-backed retention engine for SaaS, apps, and gaming.

Services

Engagement Mechanics

Analytics & AI

Industry

Retention & Churn

Company Size

SaaS, Apps, Gaming

Timeline

User Retention

35-50

D7 retention lift

35-50

D7 retention lift

35-50

D7 retention lift

Churn reduction

April 8, 2026

35-50% D7 Retention. 67% Churn Reduction.

The challenge

70% of mobile users never return after their first session. Most SaaS products lose more users than they gain each month. Retention is the growth lever nobody's pulling.

Everyone focuses on acquisition because it's visible. But a company that retains 80% of users beats a company that acquires 2x as many and retains 40%. Retention is compounding; acquisition is not. The behavioral science that drives retention has been peer-reviewed for decades: Kahneman's loss aversion (we feel losses 2x more than gains), Lally's 66-day habit formation window, Skinner's variable rewards. Most products ship without a single one of these mechanics, then wonder why their cohort charts look like hockey sticks pointing down.

The approach

Nudj is a retention engine built on the behavioral science most products ignore — streaks, loss aversion, variable rewards, and habit formation targeted at the 66-day window.

Nudj ships four retention primitives proven in the research. Streak tracking that creates loss aversion (Kahneman): breaking a 73-day streak feels worse than starting one feels good. Variable reward drops that hit the Skinner dopamine cycle: unpredictable payoffs are 2x more motivating than predictable ones. Habit formation targeted at the 66-day window (Lally's research): streaks, reminders, and recovery mechanics all calibrated to the exact timeline that turns behavior into habit. And measurable outcomes dashboards that tie every mechanic to D7, D30, and D90 retention.

The results

Retention on Nudj applies the behavioral science most products ignore. 35-50% D7 lift, 67% churn reduction — the Kahneman/Skinner/Lally playbook as a drop-in.