Countdown timer at checkout: +3.16% revenue per visitor
Adding a countdown timer to checkout lifted revenue per visitor by 3.16% and conversion rate by 2.99% in Dave Diederen's main test. Two more timer tests shown in their screenshots also came out ahead, with revenue per visitor up 3.77% and 3.23%. Average order value stayed roughly flat in all three.
- Revenue per visitor: +3.16% ($2.39 to $2.47), with an 88.7% probability of beating control. Below the usual 95% bar, so treat it as likely, not certain.
- Conversion rate: +2.99% (3.74% to 3.86%). More visitors who reached the store finished an order.
- A second timer test: +3.77% revenue per visitor and +4.00% conversion rate, with a 91.8% probability of beating control.
- A third timer test: +3.23% revenue per visitor, +5.04% conversion rate and +3.03% profit per visitor.
- Average order value: flat in the first two tests, and down 1.72% in the third ($56.06 to $55.10). The gain came from more orders, not bigger ones.
The change
The variant adds a countdown timer to checkout; exact placement was not shown.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The standard checkout with no timer on the page.
Variant
The same checkout with a countdown timer added. The post does not show the timer's design, wording, placement or what it counted down to.
Why it likely won
Our reading of the result, not the practitioner's claim.
- a visible deadline gives shoppers a reason to finish now rather than leave checkout open and come back later.
- by checkout the buying decision is mostly made, so a small nudge can tip people who were only hesitating.
- the effect was modest but repeated across several tests, which suggests a real but small lift rather than a fluke.
Caveats: Sample sizes, test lengths and the timer design were not shared, and none of the shown tests reached 95% probability on revenue per visitor. The post does not say whether the tests ran on one store or several.
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 add a countdown timer to checkout, then more shoppers will complete their order because a visible deadline discourages putting the purchase off.
- Primary metric
- Revenue per visitor
- Guardrails
- Average order value
- Refund and chargeback rate
- Customer complaints about pressure tactics
- Who should test it
- Stores with a real time-bound reason behind the timer, such as a reserved cart, a sale end or a dispatch cut-off. Fake timers that reset on reload can hurt trust, especially for premium brands with repeat buyers.
Questions
Do countdown timers at checkout increase conversions?
In Dave Diederen's tests they did, by a small margin. Conversion rate rose between 2.99% and 5.04% across three tests, and revenue per visitor rose between 3.16% and 3.77%.
Does a checkout timer lower average order value?
Not by much here. AOV was flat in two tests and fell 1.72% in a third, so the lift came from more completed orders.
Is a checkout countdown timer a dark pattern?
It can be if the deadline is fake. Tie the timer to something real, such as a cart reservation or a dispatch cut-off, and watch complaints and refunds as guardrails.
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