If you want to know whether products fit on a shelf, “Compact” beside “28 cm wide” is little help: the first product’s width is missing. A comparison becomes useful when the same row answers the same question for every product. You therefore need equivalent information before deciding which features to highlight.
Which differences change the decision?
You can identify the important information by looking at two or three products customers genuinely consider together. Questions from advice and support reveal whether space, a connector or a particular use determines the choice. Those differences belong near the top because they help people decide.
A longer feature list is not automatically more useful. A property shared by every item may be a common prerequisite. A decisive difference should not disappear among twenty identical ticks.
NN/g explains the use of comparison tables for important product properties. Select the rows using the purchasing questions you collected.
Check that each row has one meaning
An extra review column can help in a working draft:
| Row | Editorial check |
|---|---|
| Dimensions | Same order, unit and clearly stated measurement condition |
| Compatibility | Specific devices or prerequisites rather than “universal” |
| Included items | Separate included parts from optional accessories |
| Use | Describe supported suitability rather than inventing a marketing tier |
| Price | Compare the same quantity, variant and price basis |
When a value is missing, you cannot yet treat it as “No”. The table needs to leave that gap visible until it is resolved. A tick is enough for an unambiguous feature, whereas a service such as “Support” needs its scope or conditions explained so readers can actually compare the offers.
Keep the selected versions identifiable
For products with several versions, state which one is being compared. Do not place a basic version’s price beside a more expensive version’s equipment without making that distinction visible.
Changing a variant belongs to the flow too. Do its price and attributes update together? Are other comparison selections preserved? A link to the detail page should identify the item under consideration.
Check the table row by row on a phone: can you still tell which product and property a value belongs to? If the comparison scrolls sideways, users need to be able to associate the value with its heading.
Review the table through a selection task
A specific requirement lets you test whether the table supports the decision. If someone can choose a product and explain the choice through a property in the table, the comparison has helped. If they first need to reopen several detail pages and assemble the figures, essential information may still be missing.
Observe whether a highlighted recommendation is interpreted as expert advice. A “Popular” label needs a verifiable basis. A neutral comparison is often more informative than an unsupported ranking in the first version.
If selection remains difficult despite complete information, record the row and the observed misunderstanding. That gives a UI refresh or an investigation within our CRO work a specific starting point.
