@Rubendgrf
@joshtCRO
@peterac_What a site-wide element has to do
A site-wide element is seen by every visitor on every page. It has to state the offer and remove doubt without getting in the way of browsing, because a small cost repeated on every page adds up fast.
Most-tested site-wide elements
Announcement bars
Seven tests touched the announcement bar, and all seven won. Oliver Kenyon made the bar clickable and linked it to high-ticket bundles for +$74,000/month, and a clickable sale bar linking to clearance added +$57,000/month. Dave Diederen's upgraded bar with a clear offer, timer and link reported +$170K in revenue.
The bar does not always need to be busier. Dave Diederen also hid a scrolling marquee bar and reported +2.10% conversion rate and +$30,500/month.
Shipping fees and geo messaging
Three of Dave Diederen's tests went against the usual advice on free shipping. A $9.49 shipping fee beat the control by +43.81% revenue per visitor, and removing the free-shipping threshold won twice (+9.17% RPV and +7.90% RPV).
Geo-specific copy also won: "Free Shipping To DE" reported +10.42% conversion rate, and a geo-detection popup to confirm country and currency reported +12.32% conversion rate. Dave Diederen also reports that "Free Shipping to [country]" wins every time across multiple stores, though without published figures.
Fonts and images for the real audience
For an older audience, Dave Diederen updated store images to match their age (+6.47% RPV) and increased font size (+3.82% RPV). A separate test that made fonts 5% bigger reported +5.41% conversion rate.
Biggest measured wins
Kasper Dolk's new theme with a BOGO offer lifted conversion rate +44.54% (2.44% to 3.53%) at 99.7% probability to beat the old theme. It changed the theme and the offer together, so you cannot credit either alone.
Ruben's trust bar below the navigation (local shipping, patented since 2014, 34,000+ customers) reported +55% conversions. Oliver Kenyon's removal of a live chat feature recovered about $28,000/month.
Want results like this on your store?
Dave Diederen at Syntra Labs. Dave builds and tests Shopify stores at Syntra Labs, and shares most results in public.
Tests that lost (and why)
Dave Diederen's countdown timer for a European market lost -17.35% conversion rate and -35.61% revenue per visitor, tested across 20+ brands. The same practitioner won with timers in announcement bars elsewhere, so the market matters.
Removing the email popup also lost: -12.18% conversion rate and -20.51% revenue per visitor. Clean-up for its own sake is not a strategy.
Ideas not yet tested
- Kasper Dolk suggests extending the guarantee from 14 or 30 days to 90 days, and rewriting page copy to a 5th-6th grade reading level.
- Josh Thompson suggests testing free shipping over $80 against flat $4.95 shipping.
- Dave Diederen suggests making elements clickable where session recordings show dead clicks, and lazy-loading GIFs behind compressed placeholders.
Site-wide checklist built from the results
- Make the announcement bar clickable, with one clear offer and a link to where it applies.
- Test a shipping fee or threshold change instead of assuming free shipping wins.
- Name the visitor's country in shipping messages.
- Check font size and imagery against your real customer's age.
- Test timers per market before rolling them out everywhere.
- Do not remove an email popup without testing it.
Tools to run these tests
Shipping and price tests need a tool that can split pricing logic, not only page layout. See the price testing guide, the Shopify A/B testing apps comparison, and announcement bar tests.
Questions
Does an announcement bar increase conversions?
In this collection, all seven announcement bar tests won. Dave Diederen's Shop Now CTA linked to the offer reported +14.46% conversion rate, and Oliver Kenyon's clickable bar linking to high-ticket bundles reported +$74,000/month.
Is free shipping always better than charging for shipping?
Not in these tests. Dave Diederen found a $9.49 shipping fee beat the control by +43.81% revenue per visitor, and removing the free-shipping threshold won in two separate tests (+9.17% and +7.90% RPV).
Which site-wide tests lost?
Two lost. A countdown timer for a European market cost -35.61% revenue per visitor across 20+ brands, and removing an email popup cost -20.51% revenue per visitor. Both were run by Dave Diederen.