Before-and-after comparisons are simple, fast and easy to misuse. The template below keeps the content change and comparison conditions visible so a directional result does not become an unsupported causal claim.

Use it for website copy, offers, forms, email, paid creative, pricing and other reversible marketing changes.

Quick answer

A before-and-after change record preserves the exact state on both sides of a decision, then adds the intent and result needed to interpret any performance movement.

Change record

Store text as text wherever possible. Screenshots provide visual context, but searchable exact wording is easier to retrieve and compare.

  • Asset and exact location:
  • Before state or screenshot link:
  • After state or screenshot link:
  • Publication date and meaningful exposure date:
  • Reason and expected behaviour:
  • Owner:

Comparison plan

Choose dates before looking for the most favourable result. Match weekdays and campaign phases when practical.

  • Primary measure and guardrails:
  • Baseline dates:
  • Comparison dates:
  • Audience and channel scope:
  • Minimum volume or review date:
  • Known seasonal or campaign differences:

Review

Report both absolute and relative movement. A rise from 1% to 2% is one percentage point and a 100% relative increase; both statements are true, but they communicate different context.

  • Before value, after value and absolute change:
  • Relative percentage change:
  • Traffic, mix or tracking differences:
  • Outcome and evidence type:
  • What the result does not prove:
  • Decision and next review:

When to use a controlled test instead

Use stronger design when seasonality is high, traffic mix changes rapidly, several campaigns overlap, the decision is expensive to reverse or the expected effect is small. The template can still hold the final decision record.

Clear answers

Frequently asked questions

How long should the after period be?

Long enough to capture a representative cycle and adequate volume for the decision. The right window depends on traffic, buying cycle, channel cadence and seasonality.

What if another change launched during the comparison?

Record it and reduce confidence in any single-change claim. If the decision is important, isolate the changes in another test.

Should screenshots be mandatory?

Use them when visual context matters, but also record important copy, price or offer details as searchable text.

Make this part of the next decision.

Diffined keeps the change, reason, evidence and conclusion together in one private history.

Try the working prototype ↗