On the average Shopify product page, the Add to Cart button appears near the top — visible when a customer first lands, but gone by the time they finish reading reviews, checking size guides, or scrolling through photos. For a customer ready to buy, that means scrolling back up to find the button. Many don't bother. They leave. A sticky Add to Cart bar solves this by keeping a persistent buy button visible at all times, regardless of scroll position.

The impact is most significant on mobile. Over 60% of Shopify traffic is now mobile, and mobile product pages are long — images stack vertically, descriptions expand, reviews scroll deep. By the time a mobile shopper finishes reading, the ATC button is hundreds of pixels above them. A sticky bottom bar eliminates that friction entirely. Merchants who implement sticky ATC report 10–15% conversion rate lifts on product pages, with some mobile-heavy stores seeing improvements up to 20%.

This guide covers the complete setup of EA Sticky Add to Cart in seven steps, plus configuration for mobile vs desktop, social proof elements, and best practices for getting the most from the feature.

Step 1: Install EA Sticky Add to Cart

Go to the Shopify App Store and search for EA Sticky Add to Cart, or navigate directly to apps.shopify.com/ea-sticky-add-to-cart-bar. Click Add app, review the permissions (the app needs product and cart access), then click Install app.

After installation you will land in the EA Sticky Add to Cart dashboard. The bar is inactive by default — you configure it first, then enable it. No theme edits are required. The bar injects via Shopify's app embed system, which means it is cleanly removable without leaving code behind.

Step 2: Choose Your Bar Style

EA Sticky Add to Cart offers three display styles. Choose based on your store's layout and aesthetic:

  • Bottom sticky bar: A full-width bar fixed to the bottom of the screen. This is the most commonly used style and performs best on mobile. It is immediately visible and intuitive — customers expect action buttons at the bottom of their phone screen.
  • Side tab (floating button): A button anchored to the left or right edge of the screen. Less intrusive than the full bar, better for stores with editorial-heavy product pages where visual real estate is important.
  • Top sticky bar: Fixed to the top of the viewport, below or replacing the header. Best for desktop-primary stores with shorter product pages.

For most Shopify stores with mobile-heavy traffic, the bottom sticky bar delivers the strongest conversion lift. Select your preferred style in Bar Style in the dashboard and preview it in the built-in mockup viewer.

Step 3: Configure What to Show in the Bar

The sticky bar can display several elements alongside the ATC button. Showing the right combination increases buyer confidence and reduces the need to scroll back up to confirm details.

Recommended bar elements:

  • Product image (thumbnail): A small image confirms the customer is adding the right item. Enable this — it reduces add-to-cart errors on stores with many variants.
  • Product name: Short name, truncated if long. Gives context when the bar is the only visible element on screen.
  • Price: Show the current price, including any sale price with the original crossed out. Price visibility in the bar reduces checkout surprise.
  • Variant selector: If your product has color or size variants, include a dropdown in the bar. This prevents customers from adding the wrong variant and then abandoning checkout when they notice.
  • Quantity selector: Optional. Recommended for consumables or multi-unit products.

Step 4: Set Mobile vs Desktop Behavior

Mobile and desktop shoppers have different interaction patterns. EA Sticky Add to Cart lets you configure the bar's behavior independently for each device type.

Mobile settings: Keep the bar permanently visible from the first scroll. On mobile, there is no hover state — the sticky bar is the primary affordance for adding to cart once the customer has scrolled past the default ATC button. Position: bottom. Height: compact (50–55px) to avoid blocking too much screen real estate.

Desktop settings: Show the bar only after the customer has scrolled past the original ATC button (scroll offset trigger). This avoids showing the sticky bar while the default button is still visible on screen, which would be redundant. You can set a pixel offset (e.g., 400px) or use the "hide when original button is in viewport" smart option.

💡 Mobile-first tip: Test the sticky bar on an actual iPhone, not just Chrome's device emulator. Browser emulators do not always replicate iOS Safari's behavior, including how the bottom browser bar interacts with fixed-position elements. A real device test takes 2 minutes and can catch layout issues emulators miss.

Step 5: Customize Colors to Match Your Theme

A sticky bar that looks like a foreign widget erodes trust. Match it to your brand to make it feel native.

  • Bar background: Use your store's primary background color (e.g., white for light stores, dark for dark-mode stores).
  • ATC button color: Use the same color as your existing Add to Cart button on the product page — do not introduce a new color just for the sticky bar.
  • Text color: High contrast to the background. Black on white, white on dark. Accessibility standards require a 4.5:1 contrast ratio for normal text.
  • Border and shadow: A subtle top border or drop shadow on the sticky bar visually separates it from page content without being obtrusive.

Step 6: Add Social Proof Elements

Social proof in the sticky bar reinforces the purchase decision at exactly the moment a customer is ready to act. EA Sticky Add to Cart supports several social proof options:

  • Star rating and review count: Pulled automatically from your Shopify product reviews or integrated review app (Judge.me, Okendo, Yotpo). Displaying "4.8 ★ (312 reviews)" next to the ATC button directly in the bar increases conversions, particularly for customers who haven't read the reviews yet.
  • "X people viewing this" counter: Live social proof showing simultaneous viewers. Creates urgency without requiring a scarcity claim. Works best on product pages with genuine traffic — do not fabricate numbers.
  • Stock urgency text: "Only 3 left in stock." Pulled from your Shopify inventory if you enable the low-stock trigger. Set the threshold at which this message appears (e.g., show when stock drops below 5).

Step 7: Test on Mobile

Go to your storefront on your mobile phone (not an emulator) and open a product page. Scroll down and verify:

  1. The sticky bar appears after you scroll past the original ATC button.
  2. The bar does not block any important page content or overlap with the iOS/Android browser navigation bar.
  3. Tapping the variant dropdown in the bar works correctly on touch.
  4. Tapping Add to Cart adds the item and shows a cart confirmation (not a redirect to the cart page, which would interrupt browsing — configure the post-add behavior to "cart drawer" or "toast notification" instead of page redirect).
  5. The bar looks correct on multiple product pages, including products with many variants and products with long names.

Once testing passes, toggle the bar to Active in the dashboard. Changes go live in real time — no republishing or cache clearing needed.

Results You Can Expect

  • 10–15% conversion rate lift on product pages — consistent across store categories from apparel to home goods to supplements.
  • 18–25% lift on mobile specifically for stores where the product page exceeds 1,500px in length (common for long-form descriptions with images).
  • Reduced scroll-back events — analytics tools like Hotjar will show a measurable decrease in upward scroll events on product pages after enabling sticky ATC.
  • Lower product page bounce rate as the ease of adding to cart removes a friction point that previously caused abandonment.
  • Faster time-to-add-to-cart — customers add items sooner in the scroll, which correlates with higher checkout completion rates.

Best Practices for Sticky ATC

  1. Hide the sticky bar when the original ATC button is visible. Showing both simultaneously is redundant and confusing. Set a smart visibility trigger that only shows the sticky bar after the original ATC has scrolled off screen.
  2. Use "Add to Cart" not "Buy Now" on the sticky bar. "Buy Now" in a sticky bar jumps to checkout, which can interrupt comparison shopping or variant selection. "Add to Cart" is lower friction and allows continued browsing.
  3. A/B test the bar position. For some store designs, a top sticky bar outperforms the bottom. Run a two-week test before committing to one placement permanently.
  4. Don't stack too many elements. Product image, name, price, and ATC button are sufficient. Adding too many elements to the bar makes it tall and visually cluttered — especially on mobile.
  5. Monitor cart add rate in Shopify Analytics before and after enabling. "Add to cart rate" is the direct metric sticky ATC improves. If it isn't moving after 2 weeks, check that the bar is triggering correctly on mobile.

Sticky ATC Bar vs Standard Product Page CTA

Factor Standard ATC Button Only With EA Sticky ATC Bar
Button visibility while scrolling Lost once customer scrolls past it Always visible
Mobile conversion rate Baseline +10–25% lift
Action required from customer Must scroll back to top to buy Buy at any scroll position
Social proof visibility Only near the top of the page Shown persistently in the bar
Setup time Already in theme (no setup) 5 minutes to install and configure
Works without theme editing Yes (native theme) Yes (app embed, no code)

Frequently Asked Questions

What is a sticky Add to Cart button?

A sticky Add to Cart button is a persistent bar or button that stays fixed on screen as shoppers scroll a product page. Unlike the default ATC button that disappears when you scroll, the sticky version is always accessible — customers can add the product to their cart from anywhere on the page without scrolling back to the top.

Does a sticky Add to Cart really increase conversions?

Yes. Merchants using EA Sticky Add to Cart report conversion rate lifts of 10–15% on product pages, with mobile-heavy stores seeing up to 20–25% improvement. The lift is caused by removing a specific friction point: customers who finish reading a product description no longer need to scroll back up to act on their purchase intent.

Does a sticky Add to Cart work on all Shopify themes?

Yes. EA Sticky Add to Cart works with all Shopify themes including Dawn, Debut, Brooklyn, Impulse, and custom themes. It injects via Shopify's app embed system, so no theme code is modified. If you change themes later, the sticky bar continues to work without reconfiguration.

Is a sticky Add to Cart free on Shopify?

Yes. EA Sticky Add to Cart has a free plan with the core sticky bar, product name, price, variant selector, and ATC button. Paid plans add social proof elements like review stars and live visitor counts, quantity selectors, analytics, and advanced styling options.

Should I show the sticky ATC on all pages or just product pages?

Product pages only. The sticky ATC bar is designed for the product detail page where the purchase decision is made. Showing it on the homepage, collection pages, or blog posts is distracting and serves no clear function. EA Sticky Add to Cart defaults to product pages only and this setting should be kept as is.

How do I add a quantity selector to the sticky Add to Cart bar?

In the EA Sticky Add to Cart dashboard, go to Bar Settings and enable the "Show quantity selector" option. A +/- quantity input or dropdown will appear in the sticky bar. This is recommended for consumable products (supplements, coffee, skincare) where purchasing multiple units is common.

Add a Sticky ATC Bar to Your Store

Free to install. 5-minute setup. Keep your Add to Cart button visible on every scroll — on every device.

Install EA Sticky Add to Cart — Free

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