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Wednesday, October 28, 2026Wrenfield Coffee · Alex Morgan ·
Reorders agent
Reorders agent · Email · At work
Running
Klaviyo · first-time buyers

Brew-guide sequence vs the old one

“Three short emails with a brew guide for the coffee they bought will get more first-time buyers to a second order than the old five-email sequence.”

Where it stands

Too early to call. Every version needs at least 20 second orders by the planned end, Nov 6.

Day 5 of 14Oct 24 – Nov 6

The versions

VersionCustomersSecond ordersRatevs currentConfidence
Previous sequenceCurrent version
Five emails over four weeks, mostly about the roastery.
56091.6%——
Brew-guide sequence
Three short emails, each with a brew guide for the coffee they bought.
560122.1%+33%75%

Confidence is against the current version. The upright mark is the 95% a version needs at the planned end to be called the winner; before then it is a reading.

Second orders per customer, cumulative
0%1%2%3%
Oct 24Oct 28

Set-up

Where
Klaviyo · first-time buyers
Split
Alternate new customers between sequences
Measured on
Second orders per customer
Planned length
14 days
Started
Oct 24

Related

How experiments are judged
  • The current version always runs alongside the challengers, so results are compared fairly.
  • A test is called once, at its planned end: a version wins only at 95% confidence or more, with at least 20 conversions in every version.
  • Before the planned end, a lead can still reverse, however strong it looks, so the test isn't called early.
  • If nothing clears the bar at the planned end, the current version stays.
All experiments for this desk