A sticky add to cart bar keeps the buy button visible while shoppers scroll through photos, descriptions and reviews. It is one of the simplest improvements for mobile conversion. But a badly built bar can break variable products, conflict with add-on plugins or cover your content. Here is what to check.
1. It appears at the right moment
The bar should appear only after the real add to cart button scrolls out of view, and disappear when it comes back. Two buttons visible at once look cluttered.
2. Variable products done right
This is where most bars fail. When a size or colour must be chosen, the bar should follow the selected variation (price and photo) and, if nothing is selected, bring the shopper back to the options instead of showing an error.
3. Uses the real WooCommerce form
Bars that submit their own simplified form can bypass validation, product add-ons, custom fields or AJAX add to cart. A bar that triggers your real form keeps every other plugin working.
4. Mobile details
- Respects the iPhone home bar area.
- Does not cover chat buttons or cookie banners.
- Large enough to tap, small enough not to hide content.
- Respects reduced-motion settings.
5. Useful information
Product photo, name, price (including sale prices) and rating reassure shoppers that they are adding the right product. A quantity selector helps for simple products.
6. Design control
Top or bottom, phone and/or desktop, light or dark, your button colour.
7. Performance
The bar should load only on product pages and weigh a few kilobytes.
Checklist
- Shows only when the main button is hidden
- Smart variation handling
- Uses the real WooCommerce form
- Safe areas and reduced motion
- Photo, price, rating, quantity
- Position and colour options
- Lightweight
Our option
Stickyline ticks each point, including variation handling and compatibility with add-on plugins. Open the sticky add to cart demo on your phone, and read why mobile product pages lose sales.
Frequently asked questions
Does a sticky add to cart bar work on desktop?
Yes, but the biggest gain is on phones where product pages are long.
Will it conflict with my product add-ons?
Not if the bar uses your real WooCommerce form, which keeps validation and add-ons working.
Top or bottom?
Bottom is easier to reach with the thumb on phones; top can suit desktop layouts.