The math is no longer ambiguous: mobile is not a channel US retailers can treat as an afterthought to desktop. In 2026, mobile accounts for 60% of all global e-commerce sales and is on track to generate $2.4 trillion in revenue. Fresh data from SensorTower's newest mobile report and Shopify's own commerce research make the case unmistakable — brands that keep mobile as a secondary experience are leaving revenue, retention, and customer relationships on the table.

The Numbers Behind the Shift

SensorTower's State of Mobile 2026 report, released this year, confirms that consumer willingness to spend inside apps has reached a new high. Global IAP revenue surged 10.6% year over year to reach $167 billion, underscoring how decisively the market has shifted toward monetization. Even more telling: in 2025, in-app purchases reached $167 billion globally, an increase of 10% year-over-year, with IAP revenue from non-gaming apps surpassing games for the first time — a 21% YoY increase and nearly three times the amount spent just five years earlier.

This isn't just a gaming or entertainment story. India, the US, and Brazil were the leaders in app downloads in 2025, and by revenue, the US is the clear leader, generating $59 billion. American consumers are downloading fewer new apps overall but spending significantly more time and money inside the ones they keep — a pattern that rewards brands with a polished, sticky app experience over those relying on a generic mobile browser tab.

The category-level trend matters for retail specifically. Shopping app installs grew 70% overall and 123% on iOS in 2025, and 54% of all mobile commerce transactions happen in apps, compared to 46% via mobile browsers. Shoppers aren't just browsing on phones anymore — they're increasingly choosing to complete purchases inside dedicated apps when the option exists.

Why Mobile Web Alone Is Losing the Conversion Race

For years, "mobile-responsive" was treated as good enough. The data on customer behavior says otherwise. Independent benchmarking shows a consistent performance gap between native apps and mobile web across nearly every metric that matters to a retailer's bottom line:

  • Conversion rates: mobile apps convert at approximately 3.5%, compared to ~2% for mobile web — roughly 3x higher.
  • Engagement depth: app users view 286% more products per session than mobile web users.
  • Time spent: shoppers spend 201.8 minutes per month in shopping apps versus 10.9 minutes on mobile shopping websites — roughly 18x more time.
  • Retail-specific data from Poq, drawing on real merchant performance across the US, UK, Europe, and Australia, found that apps convert at 1.8x mobile web across their merchant base, with top performers exceeding 4x, and roughly 70% of app revenue is incremental after subtracting a conservative mobile web baseline.

Average order value tells a similar story. Average order value in apps runs around $95, compared to roughly $73 on mobile web. And this isn't cannibalizing existing sales — across five brands measured over 13 months, mobile web revenue does not decline as app revenue grows. Apps are additive, not a replacement for the storefront — they capture a segment of high-intent, repeat shoppers that mobile web structurally underserves.

Put simply: US shoppers already default to their phones, and the gap between "having a mobile-friendly site" and "having a dedicated app" now shows up directly in revenue per session, cart completion, and repeat purchase rate.

The Shopify Shop App Question: Borrow Reach, or Build Equity?

Shopify's own commerce research adds an important nuance for D2C brands weighing their options. Brands can access a built-in consumer audience through platforms like the Shop app, which offers more than 150 million users without the overhead of building and maintaining a custom native app. For early-stage brands or those testing mobile-app demand before committing capital, that's a legitimate on-ramp — it lowers the barrier to showing up where shoppers already are.

But reach and ownership are different assets. As one analysis of the Shopify ecosystem puts it, the pattern is consistent: the Shop app wins on reach, and a Shopify mobile app wins on conversion, retention, and the customer data you keep. A shared platform app puts your products next to competitors' and gives you limited control over branding, push notification cadence, checkout experience, or the customer data pipeline that fuels retargeting and lifetime value modeling. A custom shopping app, by contrast, is real estate you own outright — the home-screen icon, the push channel, the loyalty program, and the first-party data all belong to your brand.

The most resilient approach for growing US retailers isn't either/or. It's sequencing: use broad-reach channels like the Shop app or a strong mobile web experience to capture discovery traffic, then invest in a custom app once repeat-purchase behavior justifies the build — typically once a brand has an established base of loyal, high-frequency buyers worth retaining directly.

Building the Business Case for 2026

For US e-commerce founders and marketing leads sitting on the fence, three data points should reframe the decision from "nice to have" to "overdue":

  • Market size: in 2025, worldwide mobile e-commerce sales revenue increased 21.3% YoY to $2.51 trillion — this is not a plateauing channel.
  • US-specific momentum: US mobile retail shoppers spent an estimated $577.6 billion in 2025, and Insider Intelligence-based projections put mobile's share of US retail e-commerce climbing well past 44% within the next two years.
  • Monetization is accelerating faster than downloads — SensorTower's report shows revenue growth (10.6%) far outpacing download growth, meaning the winners in 2026 will be brands that convert existing mobile attention into revenue more effectively, not brands chasing more installs.

For a US retailer or D2C brand, that means the ROI case for a custom shopping app is now easier to build than ever: higher conversion, higher AOV, stronger retention through push notifications, and a proprietary data asset that mobile web and third-party marketplace apps simply can't replicate.

Where GSC Fits In

Deciding between mobile web optimization, a Shop-app presence, and a fully custom native app isn't a one-size-fits-all call — it depends on your order volume, repeat-purchase economics, and growth stage. As an Odoo Ready Partner serving e-commerce and D2C brands across the United States, the GCC, and India, Grey Space Computing helps retailers architect the right mobile strategy: from mobile-optimized storefronts to purpose-built shopping apps integrated with your existing commerce and ERP stack.

If your mobile traffic is growing faster than your mobile revenue, it's time for a strategy conversation. Talk to GSC about digital growth, mobile app development, and e-commerce platform services built to convert 2026's mobile-first shopper into a loyal, repeat customer.