Fundusze Europejskie Województwo Łódzkie Unia Europejska

Field notes

Practical guides to acquisition, margin and retention

Guides to acquisition, retention and measurement: POAS, CAC payback, contribution margin and free-shipping thresholds worked through with numbers, plus reviews of the Loyalz source code. Hypothetical calculations are kept apart from observations.

  • 17articles
  • 4based on source-code review
  • 7clusters

Verified implementation or data checked, with the method recorded. Sourced linked sources or explicit arithmetic. Opinion argument, no outcome numbers. Read the assumptions and limits alongside each result.

17 articles

Every article

Creative

Ad fatigue in Meta Ads: when to refresh your creative

Keep, replace or pause? Frequency alone cannot diagnose ad fatigue. A five-row diagnostic table, and a model where cost per order doubles three different ways.

Sep 2026·8 min sourced · primary sources + arithmetic
Measurement

Break-even ROAS calculator

Enter your margin, get break-even ROAS: 1 ÷ margin, so 3.33 at 30%. Then see what your current ROAS earns or costs per 1,000 of spend.

Aug 2026·2 min sourced · calculator · arithmetic
Measurement

What is POAS, and how it differs from ROAS

Three illustrative campaigns: ROAS 4.8 gives POAS 0.43 at a 9% gross margin, ROAS 2.1 gives 1.30. Define the profit numerator before reading break-even.

Updated Sep 2026·4 min sourced · arithmetic
Measurement

CAC payback period: the number an LTV:CAC ratio hides

CAC payback from cumulative cohort contribution: in the worked cohort, a CAC of 180 is covered in month 5. Why CAC ÷ monthly margin only approximates it.

Updated Sep 2026·4 min sourced · arithmetic
Measurement

Connect Meta Ads and Google Ads to Claude, with your store

Via MCP, Claude gets 11 Loyalz Insights tools and ad spend joined to store revenue per merchant and day, not per ad. Five other write tools skip the Insights log.

Updated Sep 2026·5 min sourced · own MCP · countable in the source
Measurement

Should AI agents have write access to ad accounts?

Read-only tokens by default, rules that can only pause, a spend floor and an audit row per change: the limits Loyalz enforces in code, and the five places they still fail.

Nov 2026·8 min verified · own code · cited by file
Retention

Loyalty programs for business: choosing one you can measure

What to budget for each loyalty program type, why member-versus-non-member spending does not isolate the effect, and a worked sample size: 3,528 customers per group.

Updated Sep 2026·6 min sourced · arithmetic · holdout sizing
Retention

Loyalty campaigns: how to tell if yours did anything

Plan a loyalty offer with a comparison group, explicit sample-size assumptions and a contribution calculation that includes reward costs.

Updated Sep 2026·7 min sourced · arithmetic · one cited experiment
Retention

Repeat purchase rate vs retention rate: which to use

Repeat rate and retention rate answer different questions. The formulas, the benchmark that states its sample, and why growth alone can drop your repeat rate.

Sep 2026·6 min sourced · definitions · one cited benchmark · arithmetic
Retention

Loyalty program: what it costs and what it must return

Loyalty programs are a discount with a delay. The four types, what each costs as a share of revenue, and the repeat-purchase lift needed to break even.

Sep 2026·5 min sourced · cited benchmarks · arithmetic
Retention

Customer loyalty programs: the time-to-first-reward test

Most customer loyalty programs fail one test: how long until the first reward. The formula, three worked stores, and the five decisions to make in order.

Sep 2026·4 min sourced · arithmetic · design reasoning
Retention

How to increase average order value without losing money

Free shipping at 220 lifts average order value to 183.60 in a worked example but cuts contribution by 5,420. Count orders that already qualify, then test.

Updated Sep 2026·6 min sourced · arithmetic · rewrite of the Dec 2025 legacy post

What the dot on each card means

The labels describe the basis of an article. A source-code review checks an implementation; it does not prove client outcomes. Worked examples show arithmetic under stated assumptions.

Verified · source checked
Based on inspected implementation or measured data, with the scope and method stated.
Sourced · cited
Based on linked sources or a worked example. An illustrative result is not a client result or a forecast.
Opinion
Argument, explicitly not evidence. May not contain a numeric claim about outcomes at all.