The Best-Scoring Category in Our Audits Still Fails the Thumb
Mobile Experience is the highest-scoring category in every audit we run, and it still fails the one check that decides whether a shopper's thumb can reach the button they came to tap.
Across the stores we have audited, Mobile Experience averages 77.3, ahead of Product Discovery at 71.4, First Impression at 63.1, and Product Presentation at 55.7. On paper that looks like the category stores have already solved. Look at the individual checks inside it and a different picture shows up. "Primary actions in the thumb zone" failed on 37 of the 42 stores we observed, an 88% fail rate. That is the single most common failure in the entire Mobile Experience category, sitting underneath the best average of the four.
What the check actually looks at
This check is not about whether a button exists or whether it is styled well. It is about where the button sits on the screen relative to how a person actually holds a phone. Most shoppers browse one-handed, thumb doing the work, hand wrapped around the bottom half of the device. A button placed at the top of the viewport, tucked into a corner, or buried above a long scroll of content is outside that natural arc. The shopper either stretches, shifts their grip to use two hands, or just doesn't bother.
On a first-time visit, which is what every one of our audits simulates, there is no accumulated goodwill to draw on. The shopper hasn't decided they like the brand yet. They're deciding whether the site is easy enough to bother with. A CTA that asks for an awkward reach is a small tax charged at the exact moment the shopper was ready to act, whether that's add to cart, continue to checkout, or open the menu. Small taxes at decision moments are how carts get abandoned before anything goes wrong with the product or the price.
It's not an isolated glitch
The same category has a second failure that points at the same underlying problem. "Modal close buttons are tappable" failed on 12 of 21 stores observed, a 57% fail rate. When a popup appears, usually an email capture or a discount offer, the close button is often small, placed where a thumb doesn't naturally land, or both. So the same shopper who might already be reaching awkwardly for the add to cart button now has to reach awkwardly to get rid of something blocking it.
Put the two together and the pattern is a category that handles the easy, measurable things well (text was readable without zooming on every one of the 42, none had horizontal scrolling, and none failed on touch target sizing) while missing the one thing that only shows up when you actually hold a phone and try to use the site the way a real customer would. That's exactly the kind of failure an average score hides. A category average is a blend. It can be pulled up by everything that isn't broken while the one check that touches a shopper's hand stays broken underneath it.
Why the average is the wrong number to trust here
If you only look at category averages, Mobile Experience reads as the thing you don't need to worry about right now. That would be the wrong conclusion to draw from this data. The average tells you how the category is doing across everything it measures. It does not tell you that nearly nine in ten stores we have looked at put their primary action somewhere a thumb has to work to reach. Those are two different questions, and only the second one predicts whether a specific shopper on a specific visit completes the thing they opened the app to do.
We want to be direct about what this data can and can't support. This comes from 42 audits across 40 stores, each one a single mobile visit as a first-time visitor, not a full site review and not a random sample of the market. We chose these stores for outreach, so they skew toward sites we thought were worth a closer look, not toward any representative slice of ecommerce. Eighty-eight percent from 42 stores means 37 of them, a number small enough that a few stores getting this right or wrong would move the percentage meaningfully. Treat this as a strong pattern worth checking on your own store, not as a market-wide statistic.
The practical test costs nothing. Pick up your phone, hold it the way you would if you were actually shopping, one hand, thumb doing the work, and try to complete a purchase without adjusting your grip. Do the same with any popup that appears in the first few seconds. If you have to shift your hand to reach the button you're supposed to tap, so does everyone else holding their phone the same way.
You can run the same audit we ran on these stores against your own at dropiq.ai.