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.
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.
Looking for the Top Custom CSS Apps?
We've analyzed thousands of custom css apps to identify the top performers based on ratings and install counts.
View Best Custom CSS Apps
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
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
Show the right product description for each variant, in tabs or accordions, not one long block. NEED A DIFFERENT DESCRIPTION FOR EACH VARIANT? Shopify allows one product description per product, but your variants deserve their own product descriptions, unique to every size, colour & delivery time. Add variant descriptions without a separate content setup. Shoppers see only what matches their choice, instantly. Long descriptions become collapsible product tabs or accordions, tabs on desktop & accordions on mobile. Works on product pages, collection pages & any store page. No code required. NEED A DIFFERENT DESCRIPTION FOR EACH VARIANT? Shopify allows one product description per product, but your variants deserve their own product descriptions, unique to every size, colour & delivery time. Add variant descriptions without a separate content setup. Shoppers see only what matches their choice, instantly. Long descriptions become collapsible product tabs or accordions, tabs on desktop & accordions on mobile. Works on product pages, collection pages & any store page. No code required. more Write a different variant description for each size, colour or option you sell Shoppers instantly see the right product description, with no page reload Clear variant details can reduce wrong-size orders, returns & support emails Turn long descriptions into collapsible product tabs, description tabs or FAQs Show tabs on desktop & accordion tabs on mobile, styled to match any theme
Customize products with unlimited options, price add-ons, swatches, buttons conditional logic & more 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
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
Lift AOV & conversion with one app — on-brand cart drawer, bundles, upsells, popups & sections. Verve is the on-page marketing suite: one app for your cart drawer, pop-ups, announcement bars, countdowns, page sections, product-page deals, forms and quizzes — with one design system behind them all. Verve reads your theme so every block matches your brand, or start from Verve Light and Dark. Bundles in six mechanics (quantity breaks, BOGO, mix & match, sets), five upsell types, and trigger, targeting, schedule and A/B controls on every offer. Discounts hold at checkout. No code needed. Verve is the on-page marketing suite: one app for your cart drawer, pop-ups, announcement bars, countdowns, page sections, product-page deals, forms and quizzes — with one design system behind them all. Verve reads your theme so every block matches your brand, or start from Verve Light and Dark. Bundles in six mechanics (quantity breaks, BOGO, mix & match, sets), five upsell types, and trigger, targeting, schedule and A/B controls on every offer. Discounts hold at checkout. No code needed. more Cart drawer, pop-ups, bars, page sections & product page — one app, one style Six bundle mechanics: quantity breaks, BOGO, mix & match, sets, native bundles Five upsell types with cart-aware rules, free-shipping goals and free gifts Reads your theme so every block is on-brand — or start from Verve Light & Dark Trigger, target, schedule and A/B test every offer — discounts hold at checkout
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.
Run viral giveaways, contests & sweepstakes to grow email list, boost engagement & have more sales! ViralSweep offers easy management of giveaways, sweepstakes, contests, raffles & waitlists, all while helping you boost sales & go viral! You can quickly create custom promotion pages to collect entries, analyze entrant data with charts & graphs, and easily select & notify winners. Even incentivize social media sharing to boost your promotion’s reach, generating additional leads and sales. You can collect UGC by running photo & video contests and choosing winners with votes or manual selection. ViralSweep offers easy management of giveaways, sweepstakes, contests, raffles & waitlists, all while helping you boost sales & go viral! You can quickly create custom promotion pages to collect entries, analyze entrant data with charts & graphs, and easily select & notify winners. Even incentivize social media sharing to boost your promotion’s reach, generating additional leads and sales. You can collect UGC by running photo & video contests and choosing winners with votes or manual selection. more Create your giveaway or raffle in minutes & share it easily with your customers Give bonus entries for completing social media actions: like, share, & more Run purchase-based giveaways to reward entries based on spend $1 spent = 1 entry Refer friends or complete social actions to move up spots on the waitlist Integrates with all your favorite email marketing, social media, & SMS platforms
Increase sales with AI Visual Search, Search Bar and Product Recommendations Simplify your e-commerce shopping experience and make it impressive. With our Visual Search, Search Bar and Product Recommendations plugin, you can show more customized results in user searches and increase your conversion rate. Increase your conversion rate with our AI-powered search and discovery plugin. Lightning-fast text search, image search, advanced category filtering, intuitive product filters and recommendations keep users happy. A complete suite for the discovery phase. Simplify your e-commerce shopping experience and make it impressive. With our Visual Search, Search Bar and Product Recommendations plugin, you can show more customized results in user searches and increase your conversion rate. Increase your conversion rate with our AI-powered search and discovery plugin. Lightning-fast text search, image search, advanced category filtering, intuitive product filters and recommendations keep users happy. A complete suite for the discovery phase. more Visual Search: Allow your e-commerce customers to search for products by images. Search Bar: Allow your e-commerce customers to search with AI text search. Product Recommendations: Suggest products in real time based on behaviour. Multiple Strategies: Optimize each experience with a variety of algorithms. Optimized for global sales with full Shopify Markets support.
A/B Testing With AI. Personalize & A/B Test Price, Offer, Theme, Upsell. Scale CRO With AB Testing AI-powered A/B testing, split testing, and personalization. With Visually AI, test every stage of the shopper journey: AB test homepage, PDPs, carts, A/B test checkouts and post-purchase upsells. Instantly generate site components and uncover what drives conversion rate. Visually connects to your Shopify data for full-funnel analytics and segmentation in one place. Run smarter, no-code A/B testing and CRO and reduce dev time. Migrate from abconvert, vwo, shogun AB test, intelligems or shoplift. AI-powered A/B testing, split testing, and personalization. With Visually AI, test every stage of the shopper journey: AB test homepage, PDPs, carts, A/B test checkouts and post-purchase upsells. Instantly generate site components and uncover what drives conversion rate. Visually connects to your Shopify data for full-funnel analytics and segmentation in one place. Run smarter, no-code A/B testing and CRO and reduce dev time. Migrate from abconvert, vwo, shogun AB test, intelligems or shoplift. more A/B testing in minutes: Generate, edit and launch an AB test using Visually AI Personalize by segment using catalog + behavior signals, Optimize with AB tests Leverage advanced A B testing statistical tech via powerful AB testing analytics Run a split test to max conversion rate on themes, discounts, prices & shipping Ensure no flickering and high page speed using an AB test-focused architecture
Vye alerts customers to any item they're searching for. It's not limited to simple restock alerts. Built for shops with ever-changing inventory, including collectibles, trading cards, vintage, consignment and specialty retail. Unlike typical back-in-stock apps that track one product, Vye lets customers save what they're looking for, such as a keyword, collection or vendor and get notified when a match arrives. Create subscription forms with a drag-and-drop editor, design branded email templates and add SMS alerts. Hands-on support that adapts to your store's needs. Built for shops with ever-changing inventory, including collectibles, trading cards, vintage, consignment and specialty retail. Unlike typical back-in-stock apps that track one product, Vye lets customers save what they're looking for, such as a keyword, collection or vendor and get notified when a match arrives. Create subscription forms with a drag-and-drop editor, design branded email templates and add SMS alerts. Hands-on support that adapts to your store's needs. more Notify customers when products match their exact interests, not just restocks Let customers save preferences and subscribe to personalized alerts Create custom subscription forms with a drag-and-drop editor Send email or SMS notifications automatically when new items match Request custom modifications for your store's needs
Add warnings for Prop 65 (P65), product availability, shipping delays & age verification disclaimer Want to inform customers about possible shipping delays? Need to add a global note to a certain products collection? Did you stop shipping to some countries and need an easy way to alert customers? Warn got your back. With Warn you can add unlimited, customizable warnings to your product page (PDP) and Checkout page, and target them globally or to specific products & countries. Improve EU withdrawal compliance with CCPA/GDPR accurate warnings, alerts, and reduce fraud & chargebacks. Want to inform customers about possible shipping delays? Need to add a global note to a certain products collection? Did you stop shipping to some countries and need an easy way to alert customers? Warn got your back. With Warn you can add unlimited, customizable warnings to your product page (PDP) and Checkout page, and target them globally or to specific products & countries. Improve EU withdrawal compliance with CCPA/GDPR accurate warnings, alerts, and reduce fraud & chargebacks. more Show popups and textual warning note/disclaimer on product page, cart & checkout Add unlimited warnings: Prop 65, notice, FAQ, product labels & badges and alerts Show the warnings globally or target specific products, collections & countries Fully customizable warning style, texts, images and buttons to match your store You can entirely block the checkout process when the checkout warning appears
Maximize Engagement with Webrex: The Ultimate Bar for Promotions, Countdowns, and Targeted Campaigns Boost your store's impact with Webrex, the all-in-one bar for promotions and targeted campaigns. From Countdown to Free Shipping Bars, customize effortlessly for both mobile and desktop. Utilize GEO and device targeting to optimize engagement and conversions. With the Contact Bar, easily build your email list for future promotions. Set up in minutes, no coding needed, and enjoy dedicated support to maximize your success. Boost your store's impact with Webrex, the all-in-one bar for promotions and targeted campaigns. From Countdown to Free Shipping Bars, customize effortlessly for both mobile and desktop. Utilize GEO and device targeting to optimize engagement and conversions. With the Contact Bar, easily build your email list for future promotions. Set up in minutes, no coding needed, and enjoy dedicated support to maximize your success. more Multiple Position, Multiple Bar, Multiple Animation with Full Customization Bar Type: Promotional & Countdown Bar, Add to Cart, Email Bar, Free Shipping Bar Animation Type: Regular, Moving Multiple Bar, Carousel Slide Set Diffrent Content & Design for Mobile and Desktop, Fully Customization Targeting: GEO, Device, Page & Source Targeting and Scheduling
Show a personalized greeting banner to each customer Personalized Greeting Banner lets you display a custom message to your customers using their first or last name. You can customize the text, design, and optionally show a discount or offer inside the banner. Useful for greeting returning customers and highlighting offers without changing your theme. Personalized Greeting Banner lets you display a custom message to your customers using their first or last name. You can customize the text, design, and optionally show a discount or offer inside the banner. Useful for greeting returning customers and highlighting offers without changing your theme. more Show personalized messages using customer first or last name Fully customizable banner text and design Display discount codes or special offers in the banner Works automatically for logged-in customers
Related Categories
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.