The best Shopify sticky add to cart apps keep the buy button pinned to the screen while shoppers scroll, and handle variants without breaking your theme. Pick a bare sticky bar if that's all you need; pick one with quick buy or a cart drawer only if you'd install those anyway.
A shopper taps through from an ad on her phone. She swipes past six photos, the size guide, the delivery notes and forty reviews, and somewhere around review thirty she decides she wants it. The button she needs is now a long way back up the page. A sticky add to cart bar is the fix for that moment: a slim strip, usually at the bottom of the screen, that follows her down and lets her buy from wherever she's stopped.
It's a small change, and that's the point. You don't need a theme rebuild to get it. But it isn't free of side effects either, so check your own pages before you install anything.
Test your own product page first
This takes about half an hour and tells you whether a sticky bar will help, and which kind.
- Open your best-selling product on your own phone, not the desktop preview. Scroll to the end of the reviews and count the swipes it takes to get back to the button. More than two or three and a sticky bar has a job to do.
- Open the theme editor on the product template and look through the section settings. Check whether your current theme already offers a pinned or sticky buy button before you pay for one.
- Count your options. A product with size and colour needs a bar that can show a variant selector, or one that scrolls the shopper back to choose. A single-variant product can use the simplest bar there is.
- Look at what already lives at the bottom of the screen: a chat bubble, a cookie banner, a back-to-top arrow, a free shipping message. Write them down. The bar will fight with every one of them.
- Check the share of your sessions that come from mobile in your Shopify analytics. A store that sells mostly on desktop, with short pages, gets far less from this than a mobile-heavy one with long pages.
If step one gave you a long scroll and step five shows mostly mobile traffic, a sticky bar is a small, cheap change worth testing.
What separates one bar from another
Your answers to steps three and four decide most of this, because the differences between these apps are in the details round the button, not the button itself.
Variants. A bar without a variant selector adds whatever was chosen at the top of the page, with no way to change it from the bar. That's fine for one-size products and confusing for anything else. With size and colour in play, you want either a full variant picker on the bar or variant and image sync, so the bar at least shows what's about to go in the basket. Anything less adds the wrong size and turns a sale into a return.
When it appears. A good bar stays hidden until the shopper scrolls past your theme's own button, then slides in. A bar that's visible from the first second sits on top of the photos, which is exactly where you don't want it.
Position and size. Bottom of the screen is the thumb's natural home on a phone. Top works on desktop. Keep the bar short enough that it doesn't hide the size guide or a review someone is halfway through reading, and match its colour to your theme's main button: two different greens on one page look like two different stores.
Extras. Some bars come with quick buy, a countdown timer or a whole slide cart. Each one is another script on the product page, so weigh it against what it adds. If a bigger basket is the real goal, our list of Shopify upsell apps goes further than any sticky bar will.
Just the sticky bar
Sticky Add to Cart Bar by Cat
Merchants who want the floating buy button on some pages and not others get control here over pages, collections and devices.
Stikio Sticky Add to Cart
A sticky bar with three mobile layouts to choose from, animation options and its own analytics on how the bar is used.
Sticky Add To Cart Bar Pro (Great Apps Factory)
Separate desktop and mobile settings, plus button animations, for a product bar that behaves differently on each screen size.
Booster Sticky Add to Cart
This one keeps the variant and image on the bar in step with the choices the shopper has made higher up the page.
Smart Sticky Add To Cart
Pinned bar with a variant picker, quantity selector and buy button, plus colour settings to match it to your theme.
Want AI doing the heavy lifting in your marketing?
I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.
Sticky Add-To-Cart Bar Pro (Boulder Digital Media)
For store owners who want numbers: a customisable sticky bar that reports its own performance inside the app.
Sticky bars with quick buy, timers or a cart attached
STKY Sticky Add To Cart Bar
Beyond the pinned button, you can switch on a countdown timer, a quick buy button and a cart slider from the same app.
Buy Me: Sticky Add To Cart Bar
Small app that pairs a sticky add to cart bar with a sticky cart icon and quick buy buttons across the store.
Ultimate Sticky Add to Cart
Floating button on every product page, with a countdown timer and a Buy Now option that sends shoppers straight to checkout.
Essential Cart Drawer Cart Upsell
Mainly a slide cart with upsells; the sticky add to cart bar comes included, which suits stores replacing their cart anyway.
Clicks, visitors or a flat fee
The paid plans on this list run from about $3 to $12 a month, so the sticker price is rarely what catches people out. The meter is. A click-metered plan that looks cheap can cost more than a flat fee in a good month, and the reverse in a quiet one.
| How it's metered | What counts | What to watch |
|---|---|---|
| Add-to-cart clicks | Each tap on the sticky button | Free tiers stop at a monthly click cap, and some show the app's branding until you upgrade |
| Visitors | Store visitors in a month | A sale or a viral post can push you up a tier in one weekend |
| One flat fee | Nothing, it's the same every month | You pay in quiet months too, but there's no meter to watch |
| Part of a cart drawer | Monthly store orders | The bar comes bundled with a slide cart you have to want as well |
For a new store, start on a free plan with no usage cap where you can find one. Two apps here are free outright, and another lists no usage limit or branding on its free plan, so you can learn whether the bar moves anything before a meter is involved. A busy store with seasonal spikes is usually better off on a flat fee, so one big weekend doesn't push it up a tier.
Do you make sticky add to cart bars or Shopify product page apps? Tool makers can ask to be considered for a featured place on this list.
When a sticky bar is the wrong fix
If your product pages are short, the buy button is never far away and a bar only adds clutter. If shoppers leave before they've scrolled at all, the problem is above the fold: the photo, the price or the first line of copy, and no pinned button fixes that.
And if you're about to change theme anyway, check the product page features of the shortlist first. Our guide to Shopify themes is a good starting point, and a theme with a pinned button built in is one less app slowing the page. The same goes for stores that build product pages with a page builder: check its own section library before you add a separate app, because two tools controlling one page is where layouts break.
Whatever you choose, run it for a fortnight and compare add-to-cart rate on mobile with the fortnight before. If it hasn't moved, switch it off: a bar that doesn't help is still weight on the page.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
