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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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Quick Buy Button- Customers buy products directly from the homepage, collection page & products list Quick Buy Button enhances the customer experience and reduces abandoned carts by making checkout as quick as possible. Quickly buy products from home or collection pages or products list and navigate the customer directly to the checkout page. The eye-catching quick buy button draws user attention to impulse purchases. Quick buy button lets customers can add products to their cart from home or jump straight to checkout. Improve conversion rate with a quick purchase button option. Buy Now Button! Quick Buy Button enhances the customer experience and reduces abandoned carts by making checkout as quick as possible. Quickly buy products from home or collection pages or products list and navigate the customer directly to the checkout page. The eye-catching quick buy button draws user attention to impulse purchases. Quick buy button lets customers can add products to their cart from home or jump straight to checkout. Improve conversion rate with a quick purchase button option. Buy Now Button! more Let customers buy products directly from the homepage and collection pages Let Customers add to cart products from the homepage or collection page Quick Buy button triggers impulse purchase and reduces abandoned cart Quick Add to Cart Icon button and text button to buy from the collection page Buy Now Button on the home page or collection page and skip to checkout directly

4.9(Reviews)

Floating add to cart button to reduce cart abandonment, lightweight and mobile responsive design What are the features? Floating cart to reduce cart abandonment, lightweight and mobile responsive design, improve user experience and increase conversion by showing always visible Sticky Add to Cart to your customers on the Product page!How does it work? Install the app with one click, the app works with every theme and requires no coding or changes. You can choose the style of a sticky bar and floating cart to start with. You can also modify colors, styles, and texts according to you What are the features? Floating cart to reduce cart abandonment, lightweight and mobile responsive design, improve user experience and increase conversion by showing always visible Sticky Add to Cart to your customers on the Product page!How does it work? Install the app with one click, the app works with every theme and requires no coding or changes. You can choose the style of a sticky bar and floating cart to start with. You can also modify colors, styles, and texts according to you more The app will improve your sales. You will get more sales with sticky cart Customize colors, backgrounds, text, position & more to match your site Easy to install, just one click to make it works

0.0(Reviews)

Customize product with product personalizer & variants options to boost unique shopping experiences. EZ Product Options helps merchants customize product and create unlimited product options, variants with ease. From text boxes, image dropdowns, and swatches to file uploads and conditional logic, you can build a smooth customization experience for your customers. The app is mobile-friendly, integrates easily with your store design, and saves time by reducing the need for duplicate variants. Merchants can offer personalized products, improve customer experience, and boost sales effortlessly. EZ Product Options helps merchants customize product and create unlimited product options, variants with ease. From text boxes, image dropdowns, and swatches to file uploads and conditional logic, you can build a smooth customization experience for your customers. The app is mobile-friendly, integrates easily with your store design, and saves time by reducing the need for duplicate variants. Merchants can offer personalized products, improve customer experience, and boost sales effortlessly. more Add text fields, dropdowns, checkboxes, color swatches, file uploads, and more. AI suggests optimal product options automatically based on product details No coding needed, works instantly on any theme, desktop & mobile ready.

4.8(Reviews)

Increase sales with customizable banners and countdowns that create urgency and boost conversions. Motivate customers to take prompt action with effective tools to achieve higher conversion rates. Maximize sales and turn visitors into customers using powerful features. These include animated timers to create a sense of urgency, promotional codes to incentivize purchases, attention-grabbing tickers, and discount badges to highlight special offers. Motivate customers to take prompt action with effective tools to achieve higher conversion rates. Maximize sales and turn visitors into customers using powerful features. These include animated timers to create a sense of urgency, promotional codes to incentivize purchases, attention-grabbing tickers, and discount badges to highlight special offers. more Drive FOMO with countdown timers and make conversions rise. Increase sales with unique and eye-catching designs. Highlight special offers with visually striking discount badges. Navigate effortlessly with Shopify-native interface elements. Adapt designs for various content types with ease.

0.0(Reviews)

Easily create FAQ pages & product FAQs to engage customers, build trust, and reduce support tickets. Our FAQs app helps you easily create professional FAQs for products, pages, or your help center without coding. Use ready-made templates or design custom help center FAQs that match your brand style. Let customers directly ask questions with the "Ask Question" feature. Build trust with clear, helpful answers. Organize FAQs into groups, display them anywhere in your store, and reduce support tickets effortlessly. Improve overall customer support by answering common queries upfront Our FAQs app helps you easily create professional FAQs for products, pages, or your help center without coding. Use ready-made templates or design custom help center FAQs that match your brand style. Let customers directly ask questions with the "Ask Question" feature. Build trust with clear, helpful answers. Organize FAQs into groups, display them anywhere in your store, and reduce support tickets effortlessly. Improve overall customer support by answering common queries upfront more Create product & page FAQs with custom or predefined questions easily. Engage users with an "Ask a Question" option for direct customer queries. Help customers get instant answers and reduce repetitive support tickets. Group FAQs for clean, organized navigation on product or help pages. Fully customizable, mobile-friendly, and works with all Shopify themes.

5.0(Reviews)

Boost sales with Product FAQ, FAQs Page, faq accordion, Helpdesk, Help Center, FAQs Section. FAQbucket is designed to boost sales on your store by creating add FAQs for your cart, blog FAQ, Blog Post FAQ, Collections Page FAQ, and even Password Page FAQ for seamless navigation. Limitless options and unlimited FAQ pages. Provide information for each product with Individual Product FAQs. Transform FAQ into a upsell cross sell tool also improve client support, helping clients make purchase decisions with confidence while reducing the workload of your support Helpdesk & faq accordion. FAQbucket is designed to boost sales on your store by creating add FAQs for your cart, blog FAQ, Blog Post FAQ, Collections Page FAQ, and even Password Page FAQ for seamless navigation. Limitless options and unlimited FAQ pages. Provide information for each product with Individual Product FAQs. Transform FAQ into a upsell cross sell tool also improve client support, helping clients make purchase decisions with confidence while reducing the workload of your support Helpdesk & faq accordion. more 22+ Pre build Templates with Customization options, Quick Setup and Live Editor FAQ Widget/FAQs Bubble for Easy Access with WhatsApp, Messenger, Helpdesk & more Individual Product FAQs, Product in FAQs, Blog Page FAQs, FAQ Sections Unlimited FAQs pages, Accordions Pro, Product Tabs and Easy Navigation Dynamic, Context-Specific FAQs on Every Page, Password Page FAQs & Cart Page FAQ

5.0(Reviews)

Maximize Your Store Sales & ROI with AI Assistant, Search, Merchandising, and Personalization. We're passionate about delivering a cutting-edge eCommerce experience for our clients. That's why we've developed a revolutionary platform that integrates shopper behavior, store signals, and agentic AI to help you optimize your merchandising, navigation, search filters & AI shopping assistants. Fast Simon powers shopping optimization through NO-CODE front end, API, JS SDK, REACT Components and Hydrogen. Let us help you take your eCommerce business to the next level. We're passionate about delivering a cutting-edge eCommerce experience for our clients. That's why we've developed a revolutionary platform that integrates shopper behavior, store signals, and agentic AI to help you optimize your merchandising, navigation, search filters & AI shopping assistants. Fast Simon powers shopping optimization through NO-CODE front end, API, JS SDK, REACT Components and Hydrogen. Let us help you take your eCommerce business to the next level. more Search & Discovery directs shoppers with peak speed and accuracy based on intent Merchandising engages and inspires shoppers while optimizing inventory & sales Personalized Search & Filters that boost customers' conversions Interact with shoppers using AI shopping assistants on your store's own data. Search Audiences lets you target and personalize the entire customer journey

4.7(Reviews)

Seamlessly create all bundle types like mix and match, BOGO, addons, etc, to effortlessly boost AOV! FBP | Fast Bundles provides seamless tools for creating flexible and effective bundle products. Use bundle as product upsell to create offers like mix & match, volume discount, quantity breaks, buy x get y, BOGO, cross-sell, add-ons and fixed bundles strategies to increase AOV. Let customers build their own bundle or use our bundle builder; free gifts, and AI-powered Frequently Bought Together. We empower you to create all types of bundles, maximizing revenue and delighting your customers. FBP | Fast Bundles provides seamless tools for creating flexible and effective bundle products. Use bundle as product upsell to create offers like mix & match, volume discount, quantity breaks, buy x get y, BOGO, cross-sell, add-ons and fixed bundles strategies to increase AOV. Let customers build their own bundle or use our bundle builder; free gifts, and AI-powered Frequently Bought Together. We empower you to create all types of bundles, maximizing revenue and delighting your customers. more Create bundles like Volume Discounts, Mix and Match, Upsell, and Cross-sell Increase revenue at your Point of Sale (POS) with bundles and discounts. Showcase bundled products as kits or sets, simplifying the shopping experience. Let customers customize bundles with an easy-to-use Bundle Builder. Increase customer retention by integrating subscriptions with bundles.

5.0(Reviews)

Group products (colors, styles, upsells, etc...) and show more options on the product page. Make it easier for your customers to discover all your products by grouping them based on shared attributes such as style, color, design, etc..., and display them on the product page with ease. If you sell items with similar features, this app makes it super simple to group them. The app also comes with many automations to make the process quicker and automatic. Make it easier for your customers to discover all your products by grouping them based on shared attributes such as style, color, design, etc..., and display them on the product page with ease. If you sell items with similar features, this app makes it super simple to group them. The app also comes with many automations to make the process quicker and automatic. more Create product groups that tie products together based on shared attributes Display grouped products on each product page Many display options (1 or 2 color swatches, custom images, text, etc...) Eliminate manual work with built-in automations Autohide/disable out of stock & unpublished products

5.0(Reviews)

Shop your instagram! Create an Instagram shop in minutes. Feedfy turns your Instagram feed into a shoppable experience inside your Shopify store. Embed your posts on any store page, tag the products featured in each photo, and let customers tap to view product details, pick a variant, and add to cart — all without leaving your site. A dedicated Instagram shop page is included out of the box. Posts sync from Instagram automatically, keeping your feed current. Customize layout, column count, popup colors, and button styles to match your brand. Feedfy turns your Instagram feed into a shoppable experience inside your Shopify store. Embed your posts on any store page, tag the products featured in each photo, and let customers tap to view product details, pick a variant, and add to cart — all without leaving your site. A dedicated Instagram shop page is included out of the box. Posts sync from Instagram automatically, keeping your feed current. Customize layout, column count, popup colors, and button styles to match your brand. more Display your Instagram feed as a shoppable gallery in your store Tag products on photos so customers can browse and buy in one tap Popup with variant selector and add-to-cart directly from the feed Posts sync automatically from Instagram as you publish new content Customize feed layout, columns, and popup colors from the admin

4.2(Reviews)

Organize your collections and make it easy for customers to find what they are looking for! Customers can't buy what they can't find. Shops with large catalogs or lots of variants like color, size, or brand can find that navigation quickly gets out of hand. It becomes overwhelming for shoppers to click through pages and pages of products in order to find what they’re looking for. This where the Collection Filter app steps in to help! It helps organize your collections so customers can find what they need and you're more likely to make a sale. Customers can't buy what they can't find. Shops with large catalogs or lots of variants like color, size, or brand can find that navigation quickly gets out of hand. It becomes overwhelming for shoppers to click through pages and pages of products in order to find what they’re looking for. This where the Collection Filter app steps in to help! It helps organize your collections so customers can find what they need and you're more likely to make a sale. more Create custom filters like type, vendor, size, and color. Use filters as custom navigation menus to help shoppers find their way around. Show or hide out of stock variants. Use the autotag feature to have the app sort and tag products for you. Give customers to select their preferred size or color across collections.

4.5(Reviews)

Enterprise-grade search, merchandising, filters & personalization - made easy. Findify offers enterprise-grade & AI-powered Personalized Search & Merchandising, Smart Collections & Recommendations. While merchants can choose to let Findify’s unique personalization algorithm do all the heavy lifting, they also retain full control to tailor the customer experience, should they wish to. Solutions are also fully customizable to fit with every merchant’s brand & style. | App including Findify's brand new Native Shopify Liquid Integration. Findify offers enterprise-grade & AI-powered Personalized Search & Merchandising, Smart Collections & Recommendations. While merchants can choose to let Findify’s unique personalization algorithm do all the heavy lifting, they also retain full control to tailor the customer experience, should they wish to. Solutions are also fully customizable to fit with every merchant’s brand & style. | App including Findify's brand new Native Shopify Liquid Integration. more Search anything (including content) utilizing NLP, personalization, and more. Full product control with powerful merchandising rules & visual drag & drop. Fully customizable front end. Leverage pre-built components or tailor everything Filters, grid control, promo cards & reviews integrations to inspire shoppers. Active sync ensures all product data (incl. metafields) update within seconds.

4.7(Reviews)

Recommend the correct size for clothes and shoes – get more sales and fewer returns No more boring and inaccurate size charts and size guides! Make shopping easier for your customers with our Fit Quiz. Recommend the correct size, as well as fit, width and length – on a product (SKU)-level. It takes less than 15 secs. for first-time shoppers to get a recommendation. Automatic recommendations for regulars. No sensitive questions like weight, body measurements, body scans. All the clothing and footwear categories are supported (female and male). Kidswear is not supported yet. No more boring and inaccurate size charts and size guides! Make shopping easier for your customers with our Fit Quiz. Recommend the correct size, as well as fit, width and length – on a product (SKU)-level. It takes less than 15 secs. for first-time shoppers to get a recommendation. Automatic recommendations for regulars. No sensitive questions like weight, body measurements, body scans. All the clothing and footwear categories are supported (female and male). Kidswear is not supported yet. more More sales and fewer returns for clothing and footwear brands (including unisex) Customize the design (colours, fonts, icons) and enable multi-language support Easy to set up, no size charts or garment measurements required Additional recommendations – length, width, fit Performance reports and analytics on sizing & fitting preferences of shoppers

4.3(Reviews)

Highly customizable slide-out cart with cross-sells & add-ons for a better AOV & user experience. Easily personalize your cart using our drag-and-drop editor. Choose and add our conversion-boosting features to your new slide-out cart. Increase average order value with hand-picked or smart cross-sells. Boost sales using the free shipping progress bar, low stock alerts, and promo banners. Enable the added-to-cart popup with custom layouts. Finally, match the cart to your theme with extensive customization tools. Our in-house technical support is always around for any support needs. Easily personalize your cart using our drag-and-drop editor. Choose and add our conversion-boosting features to your new slide-out cart. Increase average order value with hand-picked or smart cross-sells. Boost sales using the free shipping progress bar, low stock alerts, and promo banners. Enable the added-to-cart popup with custom layouts. Finally, match the cart to your theme with extensive customization tools. Our in-house technical support is always around for any support needs. more Custom Cart Builder: Create a visible slide-out cart & side cart on all pages Recommended Items: Boost AOV with handpicked, global or smart cross-sells Free Shipping Bar: Display a prominent progress bar for customer confidence Sticky Quick Purchase Bar on Product Pages: Easy add to cart at any point Customizable Cart Blocks: Add promo bars, notes, trust badges, popups and more

4.8(Reviews)

Supercharge Your Sales: Elevate the shopping experience with our search and dynamic filter Flash Search helps customers find your product easily & instantly with AI filters. Support: Advanced Product Search Autocomplete, Spell-check & Typo Autocorrection, Instant search suggestions with live product preview, Smart Search across product and content, Synonyms & Stopwords, Suggestion Dictionary, “Did you mean” feature to avoid giving zero results, Keyword-based redirects. You can also customize look and feel of search bar easily. Flash Search helps customers find your product easily & instantly with AI filters. Support: Advanced Product Search Autocomplete, Spell-check & Typo Autocorrection, Instant search suggestions with live product preview, Smart Search across product and content, Synonyms & Stopwords, Suggestion Dictionary, “Did you mean” feature to avoid giving zero results, Keyword-based redirects. You can also customize look and feel of search bar easily. more Advanced Search: Auto Fill and Auto Correct, Instant Search Suggestions, Synonym Vertical & horizontal filter menu, Quick View, Add to Cart,Optimized for mobile Convert more with smart search, merchandising and upsell recommendations Unlimited number of customizable filters; filers by reviews, tags & metafields Support product grid layouts from popular Shopify themes & third-party themes

3.4(Reviews)

Add unlimited product options & variants. Boost sales with seamless customer personalization. Flexi Variants enables Shopify merchants to add unlimited custom product options without coding. Create checkboxes, radio buttons, text fields, file uploads, and color swatches with conditional logic. Features include localization for 10+ languages, fully customizable UI, and a developer console for advanced control. Apply option sets across multiple products to streamline management. Perfect for stores requiring product personalization to increase customer satisfaction and sales. Flexi Variants enables Shopify merchants to add unlimited custom product options without coding. Create checkboxes, radio buttons, text fields, file uploads, and color swatches with conditional logic. Features include localization for 10+ languages, fully customizable UI, and a developer console for advanced control. Apply option sets across multiple products to streamline management. Perfect for stores requiring product personalization to increase customer satisfaction and sales. more Create unlimited product options with conditional logic and file uploads Localize option sets in 10+ languages with fully customizable UI interface Apply reusable option sets to unlimited products with bulk management tools Advanced developer console for custom integrations and workflow automation Real-time conditional logic that shows/hides options based on selections

0.0(Reviews)

Google and IAB certified consent management solution for GDPR compliance. It is uniquely designed for seamless GDPR compliance, offering a certified consent management solution. Merchants will appreciate its user-friendly interface and automated compliance features, reducing the complexity of GDPR adherence. It addresses the critical need for legal compliance, protecting businesses from potential fines and boosting customer trust. By ensuring data privacy compliance, it helps merchants build trust with their customers and operate within legal frameworks. It is uniquely designed for seamless GDPR compliance, offering a certified consent management solution. Merchants will appreciate its user-friendly interface and automated compliance features, reducing the complexity of GDPR adherence. It addresses the critical need for legal compliance, protecting businesses from potential fines and boosting customer trust. By ensuring data privacy compliance, it helps merchants build trust with their customers and operate within legal frameworks. more Easy installation and setup directly from your Shopify dashboard. Supports GDPR consent management regulations. Fully customizable to match your store’s look and feel. Provides a detailed report to give comprehensive insight on consent rate. Automatically update to stay compliant with the latest laws.

4.7(Reviews)

Add unlimited floating widgets, popups, videos, banners, surveys... to your store. The Floatly Floating Widgets App lets you add unlimited widgets to your store. It lets you add banners, offers, announcements, videos, surveys and embed any widget to your store. The widgets are floating on the page. You can change the widgets settings, position, size, make them closable, add a delay before they get opened... You can even restrict widgets to specific pages. The app has many more features. The Floatly Floating Widgets App lets you add unlimited widgets to your store. It lets you add banners, offers, announcements, videos, surveys and embed any widget to your store. The widgets are floating on the page. You can change the widgets settings, position, size, make them closable, add a delay before they get opened... You can even restrict widgets to specific pages. The app has many more features. more Easily display messages/banners to your customers. Very customizable as it allows you to add and fully configure the widgets. Add unlimited Floating Widgets, PopUps, Videos, Banners, Surveys... Restrict widgets to specific pages. Add delays before widgets get displayed. Add closable and non-closable widgets.

5.0(Reviews)

Flowbox is a User Generated Content platform developed for established eCommerce brands. Flowbox is a User Generated Content platform that helps brands leverage and distribute social content throughout the buyer journey to increase engagement, social proof and sales. Through our platform, our customers are able to collect, moderate and publish content to their website, online shop and social channels. Flowbox was founded in 2016 and is headquartered in Stockholm with regional offices in Amsterdam and Barcelona. Flowbox is a User Generated Content platform that helps brands leverage and distribute social content throughout the buyer journey to increase engagement, social proof and sales. Through our platform, our customers are able to collect, moderate and publish content to their website, online shop and social channels. Flowbox was founded in 2016 and is headquartered in Stockholm with regional offices in Amsterdam and Barcelona. more The key features you expect Built for the most demanding brands Rely on advanced data-driven insights Fuel every customer interaction with UGC

0.0(Reviews)

Maximize AOV with product bundles, quantity breaks, AI powered upsells & Frequently Bought Together Every visitor leaving with one item is a missed opportunity. Fly Bundles plugs profit leaks with high-conversion product bundle kits and combos. Use bulk discounting or a Fixed Bundle to turn tiny carts into massive orders. Our bundle upsell engine, FBT blocks, and quick add-ons make buying more the natural choice. Scale with Quantity Breaks, subscriptions, and progressive free gifts. Zero coding and 24/7 support ensure you never leave money on the table again. Every visitor leaving with one item is a missed opportunity. Fly Bundles plugs profit leaks with high-conversion product bundle kits and combos. Use bulk discounting or a Fixed Bundle to turn tiny carts into massive orders. Our bundle upsell engine, FBT blocks, and quick add-ons make buying more the natural choice. Scale with Quantity Breaks, subscriptions, and progressive free gifts. Zero coding and 24/7 support ensure you never leave money on the table again. more Boost cart value with a Fixed Bundle, BOGO or Frequently Bought Together blocks. Drive bulk sales with tiered Quantity Break and Volume Discount triggers. Incentivize larger carts with a Free Gift and automated bundle upsell tools. Build well integrated, beautiful native widgets with zero impact on store speed Breakdown of bundles for auto discounting, inventory sync, fulfilment, & return

4.9(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.