What time to first action measures
TTFA measures the speed of the path from install to the first meaningful action. That activation
event is chosen for one reason: it predicts long-term use better than anything else. It is the
app’s aha moment.
Typical e-commerce activation events:
| Action | When to use it |
|---|---|
| First add to cart | High-frequency assortments (grocery, FMCG) |
| First purchase | E-commerce with enough new-user traffic |
| First product search | When the browse-without-buying share is high |
| Creating a wishlist | Fashion and electronics — long decision cycles |
TTFA and retention
People who complete the key action within the first 24 to 72 hours after install have historically
shown higher retention at D7 and D30. The mechanism is simple: early success creates the
association that the app is useful, which lowers the probability of deletion.
Rule of thumb: if D1 retention is low and TTFA is long, the problem is onboarding. The person
did not find value before the end of the first visit.
How to shorten TTFA
Remove friction in onboarding. Every extra screen and every permission prompt before the first
action lengthens TTFA. Permissions are better requested in context — push when the person reaches
the cart, location when they open the store map.
Personalize the first screen. A new user arriving from a category ad banner for running shoes
expects to see running shoes, not a generic home page. Zero-party data from a welcome quiz —
gender, categories of interest — lets you show a relevant catalogue from the first visit.
Shorten the path to purchase. Address autofill, fast checkout and a saved card: every step
removed from the funnel lowers TTFA.
TTFA as an onboarding quality metric
Measure TTFA as a median, not a mean — the mean is distorted by outliers — for each cohort of new
installs. Track it broken down by install source, app version and operating system. A rise in TTFA
after a release is a signal to investigate what changed in the new version immediately.