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Custom CSS Shopify Apps

Discover the best Custom CSS apps for your Shopify store in 2026. Compare features, pricing, and reviews to find the perfect solution.

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We've analyzed thousands of custom css apps to identify the top performers based on ratings and install counts.

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Allow file uploads with orders and enable customers to edit images and create personalized products. Upload-Lift allows customers to upload files / images / photos on Product, Contact, Cart and Order Status pages. It's easy to set up and does not require any theme modifications. You can configure the allowed file types, and the app includes an image editor to let customers crop images in your desired format. Let customers upload photo upload on any page on your store. Upload-Lift allows customers to upload files / images / photos on Product, Contact, Cart and Order Status pages. It's easy to set up and does not require any theme modifications. You can configure the allowed file types, and the app includes an image editor to let customers crop images in your desired format. Let customers upload photo upload on any page on your store. more Fast upload of any file type up to 5GB in size. Image editor that allows cropping with predefined ratios and crop shapes. Preview of the uploaded image on the upload field and cart page. File Validations. Configure min/max file size and image dimensions. File conversion of advanced file formats e.g (PDF/Ai) into images.

4.5(Reviews)

Build trust with a stunning filterable & shoppable customer image gallery Build trust and increase conversions with a stunning shoppable & filterable customer image gallery, lookbook, photo gallery, product gallery, video gallery or portfolio gallery. Let customers upload photos, videos, tag multiple products, and inspire others to buy. Showcase relevant customer photos on product pages automatically. Offer discounts for uploads, easily moderate content, import photos from Judge.me, Instagram and TikTok. Elevate your stores trust, social proof, and product discovery Build trust and increase conversions with a stunning shoppable & filterable customer image gallery, lookbook, photo gallery, product gallery, video gallery or portfolio gallery. Let customers upload photos, videos, tag multiple products, and inspire others to buy. Showcase relevant customer photos on product pages automatically. Offer discounts for uploads, easily moderate content, import photos from Judge.me, Instagram and TikTok. Elevate your stores trust, social proof, and product discovery more Collect UGC - customers upload images & videos directly on your store Customers tag their products on each gallery post Automatically display relevant images & videos on each product page Customers can filter by products & any custom fields that you define Import images & videos from Instagram, TikTok and Judge.me

5.0(Reviews)

AOV+ with bundling product addons, related products in cart upsell, checkout & post purchase upsell. Selleasy is a high-conversion one click upsell and post purchase upsell app. Bundle frequently bought together and related products addons to drive an AOV increase. Use in cart upsell, cross sells, and automatic product recommendations to suggest complementary products. The app uses checkout upsell extensions and discount functions for bundling accessories. This mobile-responsive upsell funnel works with any theme to boost conversion rates in multi-language and multi-currency stores. Selleasy is a high-conversion one click upsell and post purchase upsell app. Bundle frequently bought together and related products addons to drive an AOV increase. Use in cart upsell, cross sells, and automatic product recommendations to suggest complementary products. The app uses checkout upsell extensions and discount functions for bundling accessories. This mobile-responsive upsell funnel works with any theme to boost conversion rates in multi-language and multi-currency stores. more Show Amazon-style "frequently bought together" product upsell bundles. Cross sell product add ons on product pages as list, grid or carousel. Pop-up a cart upsell funnel or display in-cart upsells within your theme. Display checkout upsells and post purchase page with one click upsell. Cross sell related products on the thank you page & order status page.

4.9(Reviews)

All In One Upsell app is designed to Boost Sales & AOV & encourage customers to buy more. The Essentialwolf Upsell & Cross Sell app is increase sales & AOV & user friendly with full customization tools for any business looking to increase their sales and AOV. Create highly targeted, personalized upsell funnels tailored to your customers’ preferences and spending habits—driving higher conversions and bigger sales. Plus, with real-time insights into customer behavior, you can easily track spending patterns and build even more effective upsell funnels. The Essentialwolf Upsell & Cross Sell app is increase sales & AOV & user friendly with full customization tools for any business looking to increase their sales and AOV. Create highly targeted, personalized upsell funnels tailored to your customers’ preferences and spending habits—driving higher conversions and bigger sales. Plus, with real-time insights into customer behavior, you can easily track spending patterns and build even more effective upsell funnels. more Display on product, cart, post-purchase, checkout and thanks you page. Support AI & Manual mode to personalized Upsell Funnel. Suggest related products to customers to increase the likelihood of a sale. Choose different types of layout and easy to customizable. In depth data analytics, track customer history, unlimited settings & many more.

4.8(Reviews)

Supercharge AOV and Revenue with Pre and Post Purchase One-Click Upsells. Inspire your customers to add related products/accessories across Product page, Cart and Thank you pages, and increase units per transaction. On Shopify Plus? You can supercharge your Checkout page with upsells and progress bar. Watch incremental revenue grow with our real-time analytics and fine tune your offers by A/B testing across customer journey. Inspire your customers to add related products/accessories across Product page, Cart and Thank you pages, and increase units per transaction. On Shopify Plus? You can supercharge your Checkout page with upsells and progress bar. Watch incremental revenue grow with our real-time analytics and fine tune your offers by A/B testing across customer journey. more Create Post Purchase One-Click Upsells (single & multi-product) Upsell everywhere: Product page, Cart, Thank You page Supercharge Checkout page with upsells and more (Shopify Plus Exclusive) Customize Thank You & Order Status page: Upsells, Surveys & more Customizable Slide Cart, seamless branding driving high conversion rates

5.0(Reviews)

Upsell Cart App to Improve AOV - Discounts, Free Shipping, Cross Sell & Quick Slide Cart Upsell cart helps you highlight additional products to customers as they add items to their cart which may increase your AOV. Our Quick Upsell app helps you turn every cart into a bigger sale — all before checkout. With features like upsell cart, popup cart & mini cart drawer, you can show smart product suggestions and irresistible discounts right when shoppers are most likely to buy. The cart widget makes it easy to add pre-purchase offers without interrupting the shopping flow. Upsell cart helps you highlight additional products to customers as they add items to their cart which may increase your AOV. Our Quick Upsell app helps you turn every cart into a bigger sale — all before checkout. With features like upsell cart, popup cart & mini cart drawer, you can show smart product suggestions and irresistible discounts right when shoppers are most likely to buy. The cart widget makes it easy to add pre-purchase offers without interrupting the shopping flow. more One-click upsells in the mini cart or popup cart to encourage bigger orders. Custom discounts that work with Shopify’s multiple discount combinations Pre-purchase upsell offers based on what’s already in the cart. Rewards Progress Bar: Motivate customers to spend more by showing spending goals Product recommendations using Shopify’s AI or your own chosen items.

4.3(Reviews)

Upsell Popup lets you improve revenue & Average order value Boost sales with Upsell Popup, the ultimate add to cart & checkout triggered popup app. Showcase frequently bought together products and boost cross-sells with timely, customisable popups for higher Average order value. Features include smart popup triggers, display frequency control, and mobile-friendly design to enhance your store’s shopping experience. Easy to set up and no coding required. Turn every cart into a bigger sales opportunity by increasing AOV. Boost sales with Upsell Popup, the ultimate add to cart & checkout triggered popup app. Showcase frequently bought together products and boost cross-sells with timely, customisable popups for higher Average order value. Features include smart popup triggers, display frequency control, and mobile-friendly design to enhance your store’s shopping experience. Easy to set up and no coding required. Turn every cart into a bigger sales opportunity by increasing AOV. more Add to Cart & Checkout Triggers – Instantly show popups on CTA click AI Recommendations - Suggest relevant products with AI to boost conversions Custom Discounts - Add discounts in popups to increase sales effectively Multi-language - Expand your reach and boost conversions with localised popups Fast & Optimized - Keep your store fast with a lightweight, efficient design

4.6(Reviews)

Drive more sales with countdown timers, low-stock alerts, and smart upsells Saleupscale helps you increase order value with smart upsell, cross-sell, and post-purchase offers. Easily display relevant product suggestions during checkout and after purchase, without disrupting the buying flow. Create urgency with countdown timers, low-stock alerts, and exclusive discounts. Flexible campaign options make it ideal for flash sales, limited-time promotions, and clearance events—all with a simple, no-code setup. Saleupscale helps you increase order value with smart upsell, cross-sell, and post-purchase offers. Easily display relevant product suggestions during checkout and after purchase, without disrupting the buying flow. Create urgency with countdown timers, low-stock alerts, and exclusive discounts. Flexible campaign options make it ideal for flash sales, limited-time promotions, and clearance events—all with a simple, no-code setup. more Post-purchase upsells with one-click add to order Thank-you page upsells to encourage repeat purchases Countdown timers to create urgency for promotions Real-time inventory alerts for low-stock products Extra discount pop-ups for time-based promotions

0.0(Reviews)

Upsell effectively using AI: Automate in-cart upsells, checkout upsells & bundles to boost sales. Upsell Wizard transforms your sales with AI-driven upselling and cross-selling. Master in-cart upselling, checkout upsells, and post-purchase offers with ease. Boost your average order value through strategic upsell funnels, offering discounted upsells and 'buy x get y' deals. Enjoy hassle-free setup as Upsell Wizard's AI automates compelling product suggestions and upsell opportunities. Perfect for smooth, intelligent upselling. Questions? Our US-based support team is here to help. Upsell Wizard transforms your sales with AI-driven upselling and cross-selling. Master in-cart upselling, checkout upsells, and post-purchase offers with ease. Boost your average order value through strategic upsell funnels, offering discounted upsells and 'buy x get y' deals. Enjoy hassle-free setup as Upsell Wizard's AI automates compelling product suggestions and upsell opportunities. Perfect for smooth, intelligent upselling. Questions? Our US-based support team is here to help. more Upsell and cross sell related products, different variants, and bundles. Trigger upsell offers with specific variants, products, tags or collections. Supports "buy X get Y" discounts and free products. Translate everything your customers see into the language of your choosing. Built to work with Shopify's native discount system & new post-purchase flows.

4.1(Reviews)

Add Upsell, Cross-Sell & Bundles in 8 Strategic Locations to Boost Sales, AOV & Conversions! Boost sales and increase AOV with the ultimate Shopify upsell and cross sell app. Show AI-powered product bundles, add-ons, upsell offers, and cross sell suggestions across 8+ high-converting locations - Product Page, Cart, Checkout, Post-Purchase, Thank You Page, and more. Easy to set up, fully customizable, and no coding needed. Match your brand’s look and feel with upsell widgets that convert. Start growing your Shopify store revenue today! Boost sales and increase AOV with the ultimate Shopify upsell and cross sell app. Show AI-powered product bundles, add-ons, upsell offers, and cross sell suggestions across 8+ high-converting locations - Product Page, Cart, Checkout, Post-Purchase, Thank You Page, and more. Easy to set up, fully customizable, and no coding needed. Match your brand’s look and feel with upsell widgets that convert. Start growing your Shopify store revenue today! more Product Page – Promote bestsellers, product bundles, and upsell add-ons. Cart & Pop-Ups – Trigger last-minute Shopify upsell offers in the Mini-Cart. Post-Purchase Page – Show one-click upsell and cross sell deals after checkout. Checkout Page – Boost AOV with high-value Shopify upsell offers before payment. Home & Collection Pages – Highlight bestsellers, upsell bundles, and cross sells

4.9(Reviews)

This Black Friday,maximize sales by offering personalized items tailored to your customers behaviour Upselly is the ultimate upsell and addon items app for Shopify stores. With targeted upsell suggestions on the product page, you can increase your sales and revenue effortlessly. Upselly helps you create personalized offers based on customer behavior and purchase history, with both manual and automatic suggestions. Track upsell performance with analytics and reporting features to make data-driven decisions for your sales strategy. Get up and running with intuitive user interface in no time. Upselly is the ultimate upsell and addon items app for Shopify stores. With targeted upsell suggestions on the product page, you can increase your sales and revenue effortlessly. Upselly helps you create personalized offers based on customer behavior and purchase history, with both manual and automatic suggestions. Track upsell performance with analytics and reporting features to make data-driven decisions for your sales strategy. Get up and running with intuitive user interface in no time. more Automatically match the color of selected recommended product to your theme Display price and discounted price on the product page with recommended products Manual recommendations: fine-tune manually the recommendations for each product Cart page upsell

4.3(Reviews)

Highly designed Image Slider can be displayed in the store! This application allows you to display a highly designed Image Slider in your store with no coding required; you can customize the speed at which the Image Slider flows, the number of pieces, the appearance of the arrows, and the type of animation. Bring a highly customizable Image Slider to your store. This application allows you to display a highly designed Image Slider in your store with no coding required; you can customize the speed at which the Image Slider flows, the number of pieces, the appearance of the arrows, and the type of animation. Bring a highly customizable Image Slider to your store. more Image Slider can be installed in your store. Customize the animation, speed, and design of the Image Slider. Separate images can be set for PCs and mobile.

0.0(Reviews)

The All-In-One Countdown Timer & Sale Urgency App. Increase Conversion and Maximize Sales Save time and money with a single app. Includes 10+ urgency tools/features to help unlock your full sales potential. Setup is quick, easy and fully customizable. Save time and money with a single app. Includes 10+ urgency tools/features to help unlock your full sales potential. Setup is quick, easy and fully customizable. more Countdown Timers: Create urgency on store pages and at cart or checkout. Spin the Wheel: Boost engagement, reduce site abandonment, and reward customers. Social-Proof Alerts: Show recent orders and remaining stock as customers browse. Stock Counter: Create FOMO with Quantity Bars on Product Pages. Urgency Emails: Send Sale Alerts/Reminders + Add a Countdown Timer to any email.

4.1(Reviews)

Fast responsive slide cart and cart upsell with free shipping bar and free gift to boost AOV and CR V1 Slide Cart & Cart Upsell is a full featured solution to improve the customer experience in the checkout to boost AOV and conversion rate. The sticky cart drawer works with your theme with minimal impact on performance. Implement a cart discount functionality and calculate shipping costs (include them in the totals) and show delivery times. Define maximum order quantity for cart items. Show a free shipping bar and free gifts. Include cart upsells and gift wrap to reduce cart abandonment. V1 Slide Cart & Cart Upsell is a full featured solution to improve the customer experience in the checkout to boost AOV and conversion rate. The sticky cart drawer works with your theme with minimal impact on performance. Implement a cart discount functionality and calculate shipping costs (include them in the totals) and show delivery times. Define maximum order quantity for cart items. Show a free shipping bar and free gifts. Include cart upsells and gift wrap to reduce cart abandonment. more Cart page, cart slider and sticky cart with cart discounts and cart upsells Offer up to three free gifts and a free shipping bar with custom thresholds Show cart announcements with countdown and legal texts with a terms checkbox Include shipping costs in totals, show benefits and estimate delivery dates Add gift wrap and order notes and customize every style to mach your design

5.0(Reviews)

AI cart upsell: Post purchase upsell, checkout upsell, thank you page upsell, volume discount & more Vanga AI automates any upsell for a rapid one click upsell experience! A fully custom cart with CSS-open helps you tailor it to your store. Make your cart upsell, cross sell, checkout upsell, post purchase upsell etc consistent with your store needs. Avoid checkout blocks & watch customers come back to rebuy! Boost AOV with an order bump & selleasy with any AI-based upsell: one click upsell, cart upsell, post purchase upsell, checkout upsell, cross sell and more! Install, enable upsells and win! Vanga AI automates any upsell for a rapid one click upsell experience! A fully custom cart with CSS-open helps you tailor it to your store. Make your cart upsell, cross sell, checkout upsell, post purchase upsell etc consistent with your store needs. Avoid checkout blocks & watch customers come back to rebuy! Boost AOV with an order bump & selleasy with any AI-based upsell: one click upsell, cart upsell, post purchase upsell, checkout upsell, cross sell and more! Install, enable upsells and win! more Bump orders with cart upsell, cross sell, checkout upsell, thank you page upsell Boost user confidence with trust badges & the option to add order notes to cart Reconvert carts with checkout upsell, cart upsell, one click upsell & cross sell Tailor your store with pre-order, custom pre-order message & a fully custom cart Integrations with Klaviyo & Kaching bundles: cart upsell + cross sell with ease

5.0(Reviews)

Simplify Your Storefront by Hiding Out of Stock Variants Instantly! Elevate your store’s shopping experience with VarHide - Hide Sold Out Variants, the ultimate tool for managing out-of-stock variants in your inventory. This intuitive app automatically hides unavailable or sold out variant options, ensuring a clean and organized storefront. With effortless integration and real-time updates, VarHide keeps your customers focused on what’s available in your store. Elevate your store’s shopping experience with VarHide - Hide Sold Out Variants, the ultimate tool for managing out-of-stock variants in your inventory. This intuitive app automatically hides unavailable or sold out variant options, ensuring a clean and organized storefront. With effortless integration and real-time updates, VarHide keeps your customers focused on what’s available in your store. more Automatically hide out of stock variants from store's display Changes or updates in the stock levels are reflected immediately Flexibility to hide or display out-of-stock variants based on your preferences

5.0(Reviews)

Showcase every variant’s unique details – metafields included. Make complex products clear. With Variant Description OMG you can now add a description for each variant. Increase sales, minimize returns, and customer support with descriptions for every product variant. Communicate different shipping times or availability information, provide variant sizing information, display variant materials or fabrics, and differentiate between different kits or combo packages⁠—there are many use cases. This app is the solution for complex products, designed to enhance your product pages. With Variant Description OMG you can now add a description for each variant. Increase sales, minimize returns, and customer support with descriptions for every product variant. Communicate different shipping times or availability information, provide variant sizing information, display variant materials or fabrics, and differentiate between different kits or combo packages⁠—there are many use cases. This app is the solution for complex products, designed to enhance your product pages. more Add a description for each product variant and display variant metafields Use your own custom variant metafield and show shipping times or specifications No coding require. Easy installation for both Online Store 2.0 and Legacy themes Rich full text editor that supports images, videos, links, tables and many more Bulk import and export

4.9(Reviews)

Add unique variant descriptions to your products. A simple way to showcase product variant details. With Variant Description Pro you can now add a description for each variant. And support bulk editing. Increase sales, minimize returns, and customer support with descriptions for every product variant. Communicate different shipping times or availability information, provide variant sizing information, display variant materials or fabrics—there are many use cases. This app is the solution for complex products, designed to enhance your product pages. With Variant Description Pro you can now add a description for each variant. And support bulk editing. Increase sales, minimize returns, and customer support with descriptions for every product variant. Communicate different shipping times or availability information, provide variant sizing information, display variant materials or fabrics—there are many use cases. This app is the solution for complex products, designed to enhance your product pages. more Add a description for each product variant Add input/option for each product variant Rich full text editor that supports images, videos, links, tables and many more Bulk add/update descriptions for product variants The app works with all themes. Chat with us to customize app as per your needs

5.0(Reviews)

Product Description of Selected Variant | Tabs/Accordion in Product Description, FAQ Page & Sections Variant Descriptions King helps you showcase tailored product details for each variant— like care instructions or technical info. Keep long descriptions organised with tabs or collapsible accordions for a cleaner layout. Extend this flexibility to any page or theme section, from FAQ and Returns to Shipping, Privacy, or T&C. Enhance clarity, improve navigation, and create a seamless shopping experience without coding. Talk to our team for a custom setup for your store. Variant Descriptions King helps you showcase tailored product details for each variant— like care instructions or technical info. Keep long descriptions organised with tabs or collapsible accordions for a cleaner layout. Extend this flexibility to any page or theme section, from FAQ and Returns to Shipping, Privacy, or T&C. Enhance clarity, improve navigation, and create a seamless shopping experience without coding. Talk to our team for a custom setup for your store. more Add unique product description for product variants. Minimise returns & support Show product descriptions in Tabs/Accordions. Switch tabs to accordion on mobile Customize look of Product Tabs & Accordions. Add Product Review Tabs/Accordions Add Tabs/Accordion FAQ to any page or theme section. FAQ. Q&A. Privacy. Returns The app works with all themes. Chat with us to customize app as per your needs.

5.0(Reviews)

Overcome the 3 product options 100 variant limit with unlimited product options & variant add ons. Advanced product options w/ colour swatches & color variant. Create multi select & conditional logic w/ VO Product Options. Use as a product configurator; texboxes, surcharges, & monograms. Create price addons for best custom option variants, & multi variants. VO Options, product varient picker, textfield, textify, variant app, Multiple attributes, g-variants product options, unlimited variant product options to customize products easify options bold product option Advanced product options w/ colour swatches & color variant. Create multi select & conditional logic w/ VO Product Options. Use as a product configurator; texboxes, surcharges, & monograms. Create price addons for best custom option variants, & multi variants. VO Options, product varient picker, textfield, textify, variant app, Multiple attributes, g-variants product options, unlimited variant product options to customize products easify options bold product option more price add on, custom text box, checkbox, photo upload photo, custom options upload image upload file product addons product personalizer, variant picker Infinite Product Options and Custom variant image swatch variant color swatches custom product builder, product add on infinite, options variant image variant textbox product variations best custom product options variant option text field

4.6(Reviews)

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About Custom CSS Apps for Shopify

Custom CSS apps are essential tools for Shopify merchants looking to enhance their store's functionality and improve customer experience. These specialized applications help store owners streamline operations, increase sales, and provide better service to their customers.

When choosing a custom css app for your Shopify store, consider factors such as features, pricing, customer support, and compatibility with your theme and other apps. Reading reviews from other merchants can also provide valuable insights into the app's performance and reliability.

The apps listed on this page represent some of the best custom css solutions available in the Shopify App Store. Each has been selected based on its functionality, user ratings, and overall value for Shopify merchants.