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 Product page upsells with one-click add to order 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
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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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.
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
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
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.
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.
Build a cart drawer with upsells, bundles, rewards, announcement bars, trust badges, popups & more V1 helps merchants build a custom cart drawer and cart page with upsells, product bundles, rewards, discount fields, announcement bars, trust badges, popups, forms, quizzes, page sections, and campaign targeting. Create offers for cart, product, collection, landing, and custom pages, then use scheduling, localization, A/B testing, reusable presets, analytics, discounts, loyalty rewards, gift cards, and thank-you content to manage the full conversion flow from one admin. V1 helps merchants build a custom cart drawer and cart page with upsells, product bundles, rewards, discount fields, announcement bars, trust badges, popups, forms, quizzes, page sections, and campaign targeting. Create offers for cart, product, collection, landing, and custom pages, then use scheduling, localization, A/B testing, reusable presets, analytics, discounts, loyalty rewards, gift cards, and thank-you content to manage the full conversion flow from one admin. more Cart drawer and cart page with checkout, totals, discount fields, and notes Upsells, product bundles, rewards, free gifts, gift wrap, shipping protection Announcement bars, trust badges, banners, countdowns, and social proof Popups, forms, quizzes, landing pages, and reusable page sections Target campaigns and track zones, A/B tests, loyalty, forms, and analytics
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
Simplify Your Store by Hiding Out of Stock Variants across sales channels & catalogs 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 online store or any other sales channels or catalogs. 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 online store or any other sales channels or catalogs. 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 Support for multiple sales channels, B2B &. Region catalogs Flexibility to hide or display out-of-stock variants based on your preferences
Display unique, dynamic descriptions and metafields for every product variant Give shoppers the exact information they need when they choose a variant. Variant Description OMG lets you add unique descriptions, specs, images, tables, shipping notes, sizing details, materials, care instructions, to each product variant. Help customers understand what they’re buying, reduce support questions, and make complex products easier to purchase. Give shoppers the exact information they need when they choose a variant. Variant Description OMG lets you add unique descriptions, specs, images, tables, shipping notes, sizing details, materials, care instructions, to each product variant. Help customers understand what they’re buying, reduce support questions, and make complex products easier to purchase. more Add a unique description for each product variant Use your own custom variant metafields 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
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
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.
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
Help shoppers compare variants faster on product & collection pages - while Google still indexes BOOST CONVERSION with GROOPIE - the swatch app for stores that list each color or style as a separate product for SEO. Show color, image, button, and dropdown swatches on product, collection, search, and home pages. Every product keeps its own URL and ranking. Auto-create groups from titles or tags, redesign Shopify's variant picker, build Frequently Bought Together groups, and track swatch clicks with analytics. Free plan with collection swatches, no watermark. Theme editor- no code. BOOST CONVERSION with GROOPIE - the swatch app for stores that list each color or style as a separate product for SEO. Show color, image, button, and dropdown swatches on product, collection, search, and home pages. Every product keeps its own URL and ranking. Auto-create groups from titles or tags, redesign Shopify's variant picker, build Frequently Bought Together groups, and track swatch clicks with analytics. Free plan with collection swatches, no watermark. Theme editor- no code. more Products as variants: Link separate listings; each product keeps its own page Collection & search swatches: Color/image/button swatches on product cards Auto-create product groups: From titles or tags in a few steps Custom variant picker: Redesign Shopify options as swatches, buttons, dropdowns Swatch analytics: Track clicks; find top-performing colors & styles
Add Variant Options in Product Title to improve shopping experience. Variant Title Magic lets you alter your product titles based on the chosen variant, resulting in clearer understanding and minimized confusion for customers. The app automatically updates the product title when a variant is selected and allows you to set a single rule for all product variants in your store, making it user-friendly and straightforward. Implementation is as easy as pressing a button, and you can enjoy the benefits of this product template app right away. Variant Title Magic lets you alter your product titles based on the chosen variant, resulting in clearer understanding and minimized confusion for customers. The app automatically updates the product title when a variant is selected and allows you to set a single rule for all product variants in your store, making it user-friendly and straightforward. Implementation is as easy as pressing a button, and you can enjoy the benefits of this product template app right away. more Update product title based on the variant selected. Set up a single title rule for all your variants based on product information's. Just One Click App reflect of complete product template information.
Your inventory + VDB virtual inventory means customers can build rings and order them from you. Create an engaging online experience by making it easy for your visitors to mix and match gemstones and mountings to create custom rings. Combine your own inventory with virtual inventory to dramatically expand your inventory offering. All within an extension customized to match your website theme and localized for language and currency. Put your customers in control of their ring creation experience! Let them match, compare and build the ring of their dreams. Create an engaging online experience by making it easy for your visitors to mix and match gemstones and mountings to create custom rings. Combine your own inventory with virtual inventory to dramatically expand your inventory offering. All within an extension customized to match your website theme and localized for language and currency. Put your customers in control of their ring creation experience! Let them match, compare and build the ring of their dreams. more Combine owned and virtual inventory for maximum ring-building potential Customize filters, pricing, display, language & currency Select your suppliers and product selection to fit your merchandising strategy. Interactive 3D ring previews to boost customer's confidence and conversions. Control diamond certificate number visibility
Product recommendation quiz builder for higher conversions, more leads, and faster email list growth When shoppers can't find the right product, they leave. Veeform helps you create high-converting product recommendation quizzes that guide shoppers to their perfect match. Build quizzes in a snap with our AI-powered quiz builder - no code needed. Run skincare, hair, gift, pet, vitamin, style, or personality quiz funnels with smart logic jumps and scored flows. Deploy popup quizzes, collect emails and valuable customer data, then sync with Shopify and your CRM to run high-ROI marketing campaigns. When shoppers can't find the right product, they leave. Veeform helps you create high-converting product recommendation quizzes that guide shoppers to their perfect match. Build quizzes in a snap with our AI-powered quiz builder - no code needed. Run skincare, hair, gift, pet, vitamin, style, or personality quiz funnels with smart logic jumps and scored flows. Deploy popup quizzes, collect emails and valuable customer data, then sync with Shopify and your CRM to run high-ROI marketing campaigns. more Create a product quiz, quiz funnel, popup quiz & questionnaire in minutes Customize quiz design with 50+ templates: colors, fonts & full branding options Use AI-powered quiz builder, logical jumps & scoring for dynamic quiz flows Recommend products with personalized quizzes, scored quizzes & tests Embed quizzes inline, as popups, buttons, teasers or shareable links anywhere
Easily Hide Sold Variants for a Cleaner Shop! Unveiling Success with Veil. Say goodbye to confusing customers with sold-out products! ✨ Unveiling only available options, Veil keeps your store looking sleek & tempting. Hide sold-out variants in a click, boosting sales & customer satisfaction. Easy to use, it lets you focus on what you love – running your business! Ready to unveil a better shopping experience? Get Veil today! Say goodbye to confusing customers with sold-out products! ✨ Unveiling only available options, Veil keeps your store looking sleek & tempting. Hide sold-out variants in a click, boosting sales & customer satisfaction. Easy to use, it lets you focus on what you love – running your business! Ready to unveil a better shopping experience? Get Veil today! more Hide sold-out, unavailable or any custom variant Hide any specific variants regardless of inventory level. No need to delete it. Hide variants based on custom rules such as inventory or tags Hide variants when inventory qty is less than x or any condition you like Works with even the customised theme and any other theme
Boost sales and decrease returns with personalized AI-driven size recommendation Vestico provides personalized size recommendations for apparel brands with the power of artificial intelligence. No more guesswork or worrying about fit – Vestico will reduce returns and boost sales by ensuring customers get the perfect fit every time. As customers shop, Vestico continuously refines its recommendations on a product level, making them more accurate with each interaction. Its user-friendly interface will complement any brand identity, with no lift from your side. [[[ Vestico provides personalized size recommendations for apparel brands with the power of artificial intelligence. No more guesswork or worrying about fit – Vestico will reduce returns and boost sales by ensuring customers get the perfect fit every time. As customers shop, Vestico continuously refines its recommendations on a product level, making them more accurate with each interaction. Its user-friendly interface will complement any brand identity, with no lift from your side. [[[ more Size recommendation on every apparel item AI-powered system that learns from customers’ purchases and gets smarter Tested improvement in returns rates and conversion metrics Easy to install & next-day launch Access to the dashboard for in-depth analytics & customization options
Easily create multi-level filters for quick search and compatibility checks, reducing return rates. Enhance your store with a YMM search widget for automotive parts & related products. This widget helps customers find compatible items for their cars, motorcycles, trucks, etc., via a filtered search. Customize YMM dropdowns and display fitment info on orders to reduce incompatibility returns. It improves the shopping experience and boosts customer satisfaction. Enhance your store with a YMM search widget for automotive parts & related products. This widget helps customers find compatible items for their cars, motorcycles, trucks, etc., via a filtered search. Customize YMM dropdowns and display fitment info on orders to reduce incompatibility returns. It improves the shopping experience and boosts customer satisfaction. more Enhance your store's search with a versatile YMM search widget finder. Display fitment information and compatibility charts on product pages. Display product fitment in orders to reduce return rates for purchased items. Database containing newly released vehicles year round Provide comprehensive design or customization support for YMM applications.
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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.