Definition
Core Action Frequency measures how often users perform the single most important action in your product — the action that delivers the primary value. For a messaging app, it's sending messages. For a trading app, it's executing trades. For a project tool, it's creating or completing tasks. This metric matters because frequency of the core action is the strongest leading indicator of retention and lifetime value.
Formula
How to measure
Count `core_action` events per user per week (or per day, depending on expected frequency). Define what constitutes the core action in your product spec before measurement. Report mean and median values segmented by user tenure and plan tier.
Industry benchmarks
Varies dramatically by product type. Daily-use tools (messaging, social): 5–20+ actions/day. Weekly-use tools (project management, analytics): 3–10 actions/week. Periodic tools (tax software, travel booking): measured per session rather than per week.