'Ships by Tomorrow' under cart checkout button: +9.04% RPV
Test run byDave DiederenSyntra Labs
Commentary byLiftArchiveOur analysis, not theirsAdding a "Ships by Tomorrow" line directly under the checkout button in the cart drawer lifted revenue per visitor by 9.04% in Dave Diederen's test. Conversion rate rose 6.65% and profit per visitor rose 9.31%. The test also had a third version, but the post doesn't explain what it changed.
- Revenue per visitor: +9.04% ($1.83 to $1.99). The testing tool estimated about $55,065 in extra revenue per month.
- Conversion rate: +6.65% (3.16% to 3.37%). More cart viewers went on to buy.
- Profit per visitor: +9.31% ($1.19 to $1.30). The gain held after costs.
- Average order value: +2.24% ($57.70 to $58.99), with a range of -5% to +10%. Treat this as roughly flat.
- A third arm, labelled "With Message &..." (cut off), also beat control at 3.31% conversion and $1.95 revenue per visitor. What it added isn't shared.
The change
The variant adds a 'Ships by Tomorrow' line directly under the checkout button.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The standard cart drawer, with no delivery promise near the checkout button.
Variant
The same cart drawer with a short "Ships by Tomorrow" line placed right under the checkout button.
Why it likely won
Our reading of the result, not the practitioner's claim.
- at the cart, many shoppers have chosen the product and their last worry is delivery time. A clear dispatch promise answers that.
- putting the line right under the button means the reassurance is seen at the moment of clicking, not buried in a shipping policy.
- "tomorrow" makes the order feel close, which can nudge people to finish now instead of later.
Caveats: Sample size and test length were not shared. The tool's ranges cross zero for every metric (for example -1% to +15% on conversion), so a smaller real effect is possible. This is one store, and the brand was not named.
Who ran it
Dave Diederen (@DaveDiederen) shared this test on X. The numbers and screenshots are theirs.
View the original post on X
How to run this test on your store
- Hypothesis
- If we show a 'Ships by Tomorrow' line under the cart drawer checkout button, then more shoppers will check out because their delivery-time doubt is answered at the point of decision.
- Primary metric
- Revenue per visitor
- Guardrails
- Average order value
- On-time dispatch rate
- Delivery-related support tickets
- Who should test it
- Stores that really can dispatch next day for most orders. Skip it if fulfilment is slow or patchy, because a broken promise costs more than it earns.
Questions
Does showing shipping speed in the cart increase conversions?
In this test, a 'Ships by Tomorrow' line in the cart drawer raised conversion rate by 6.65% and revenue per visitor by 9.04%. The ranges crossed zero, so the true lift may be smaller.
Where should a delivery promise go in the cart?
Dave Diederen placed it directly under the checkout button, so it is read at the moment of the click. Other placements were not tested here.
Should I add 'ships tomorrow' if I can't always meet it?
This test doesn't answer that, but the copy only works if it's true. Missed promises tend to create support tickets and refunds.
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