Create strong forms easily with in just 3 steps using our easy-to-use SK: Advanced Form Builder app. Using our Form Builder app, you can create basic to complex forms with predefined templates or from scratch. Our app has templates like Contact Us, Booking, Warranty, Wholesale Inquiry Form which compatible with all themes. Change look & feel of the form as you want using custom CSS. Email will let you know from which page form was submitted. We have SMTP & Klaviyo which add user to specific Klaviyo list. Tag user when form submitted, G-Sheet, Conditional Logic, zapier & more-upto 2GB of storage Using our Form Builder app, you can create basic to complex forms with predefined templates or from scratch. Our app has templates like Contact Us, Booking, Warranty, Wholesale Inquiry Form which compatible with all themes. Change look & feel of the form as you want using custom CSS. Email will let you know from which page form was submitted. We have SMTP & Klaviyo which add user to specific Klaviyo list. Tag user when form submitted, G-Sheet, Conditional Logic, zapier & more-upto 2GB of storage more Create forms, collect customer data, and allow file uploads easily. Create forms with predefined templates and manage forms by drag & drop feature. Easy integrations of the Klaviyo, Gtag, FB Tracking, GSheet Add tag in customer. Tag customer when form is submitted. Like: Wholesaler, Retailer, etc. Personalized forms are designed to match your shop's style perfectly.
Custom CSS Shopify Apps
Discover the best Custom CSS apps for your Shopify store in 2025. 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
The All-in-One Sales-Boosting App for Your Store. Supercharge your store with powerful tools designed to enhance the shopping experience, drive conversions, and streamline store management—all in one app. Sledge gives you 15 essential widgets to optimize your store, from intuitive search and smart filters to wishlist and product reviews. Set up in minutes, customize effortlessly with the Customizer, and seamlessly integrate with any theme. Plus, more powerful widgets are on the way! Supercharge your store with powerful tools designed to enhance the shopping experience, drive conversions, and streamline store management—all in one app. Sledge gives you 15 essential widgets to optimize your store, from intuitive search and smart filters to wishlist and product reviews. Set up in minutes, customize effortlessly with the Customizer, and seamlessly integrate with any theme. Plus, more powerful widgets are on the way! more Instant Search & Smart Filters – Improve product discovery effortlessly. Wishlist & Reviews – Boost engagement and build customer trust. Presets & Customizer – Use ready-made templates or fine-tune every detail. Custom Code Support – Add scripts to enhance widget functionality & design. Sales-Boosting Widgets – Trust Badges, Recently Viewed, Review Snippets & more.
Drive sales with animated announcement bars: sticky, scrolling, rotating, sliding, and countdowns Create fully customizable announcement bars to highlight promotions, share updates, and engage visitors across your store. Add countdown timers, rotating messages, and call-to-action buttons—no coding required. Target specific countries, pages, or customer groups, and control when and where each bar appears. Choose from 28 pre-built themes or design your own. With flexible styling, smooth animations, scheduling, and performance insights, it's easy to keep your visitors informed and engaged. Create fully customizable announcement bars to highlight promotions, share updates, and engage visitors across your store. Add countdown timers, rotating messages, and call-to-action buttons—no coding required. Target specific countries, pages, or customer groups, and control when and where each bar appears. Choose from 28 pre-built themes or design your own. With flexible styling, smooth animations, scheduling, and performance insights, it's easy to keep your visitors informed and engaged. more Sticky Announcement Bar: Add a fixed-position promo banner to any store page. Countdown Timer Bar: Create urgency with limited-time countdown timer banners. Scrolling Announcement Bar: Display moving marquee announcement banners easily. Rotating Announcement Bar: Feature multiple sliding promo banners on pages. Geo-Targeted Promo Bar: Easily schedule banners & target visitors by location.
Design your store with banner slider, slideshow, video banner & hero sections that convert for BFCM Design a shopping experience that connects with image slider, video banner, image slider, carousel, slideshow and hero sections to boost engagement. Increase BFCM sales with product slider, countdown timers, and promo banners. Build landing pages, coming soon pages, 404 pages, maintenance pages, hero sections, and more using a drag & drop editor. Choose from ready-made templates, and animations. Multilingual, RTL, and social-ready—built to convert visitors into loyal buyers. Design a shopping experience that connects with image slider, video banner, image slider, carousel, slideshow and hero sections to boost engagement. Increase BFCM sales with product slider, countdown timers, and promo banners. Build landing pages, coming soon pages, 404 pages, maintenance pages, hero sections, and more using a drag & drop editor. Choose from ready-made templates, and animations. Multilingual, RTL, and social-ready—built to convert visitors into loyal buyers. more Create slideshow, testimonial, video banner, carousel, page, image slider, hero Use 600+ ready made slider templates and addons to create slider in no time Add social proof & turn views into sales with YouTube, Vimeo, Instagram sliders Reach more customers with multilingual, RTL, and mobile-ready sliders Compatible with Shopify 2.0 online store themes and popular landing page builder
Create clickable image banner slideshows and interactive image sliders within minutes Add clickable image banner slideshows, clickable sliding image banners, and interactive image sliders easily! Turn any hero slider and slideshow into an interactive experience with clickable sliding image banners that drive engagement. Perfect for making a slideshow image clickable, our app ensures seamless customization, mobile responsiveness, and high-converting designs for image sliders or any banner slideshows. Add clickable image banner slideshows, clickable sliding image banners, and interactive image sliders easily! Turn any hero slider and slideshow into an interactive experience with clickable sliding image banners that drive engagement. Perfect for making a slideshow image clickable, our app ensures seamless customization, mobile responsiveness, and high-converting designs for image sliders or any banner slideshows. more Up to 6 clickable images per slideshow Full-width and boxed layouts Dots & arrows pagination options Four banner sizes: Adapt to image, small, medium, large Speed, autorotate and styling controls
Increase your sales with our announcement bars, promotional bars, free shipping bars & banners bar The Smart Announcement Bar simplifies and accelerates the process of informing about your business updates, promotions, and events to customers with just a few clicks. You can integrate a customizable banner into your store, ensuring your customers stay informed. You can display multiple bars featuring various products and collections. Furthermore, you can show unique sales promotions on different pages of the store. The Smart Announcement Bar simplifies and accelerates the process of informing about your business updates, promotions, and events to customers with just a few clicks. You can integrate a customizable banner into your store, ensuring your customers stay informed. You can display multiple bars featuring various products and collections. Furthermore, you can show unique sales promotions on different pages of the store. more Promote sales with multiple announcement bars, Multi-message campaigns. Customised banner Positions along with rotating(Marquee), and sticky bar. Banner configurations including colours, fonts, alignment, position, and more. Display announcement bar on collection pages and all products in the collection Display announcement bar based on product tags or manual selection
Help shoppers find what they mean with AI-powered search, smart filters, and instant results Filter products instantly by price, size, color, tag, vendor, brand, collection and metafields, etc. Easy to install and custom your Product filter menu. AI-powered search delivers more relevant results with intelligent synonyms, instant suggestions. Easy integrate with original search bar, theme filter, category filter. Your users are easier to find a right product with sidebar filter, filter collection. More over, you can use the app to display product variants as separate products Filter products instantly by price, size, color, tag, vendor, brand, collection and metafields, etc. Easy to install and custom your Product filter menu. AI-powered search delivers more relevant results with intelligent synonyms, instant suggestions. Easy integrate with original search bar, theme filter, category filter. Your users are easier to find a right product with sidebar filter, filter collection. More over, you can use the app to display product variants as separate products more Smart filter app to custom filter for different collection filter, category. Unlimited filter menu by tag, sale %, review, metafields, variants filter... AI-powered search and discovery solution. Year Make Model search AI semantic search, Full-text search, Auto-suggestion, Search Redirects etc. 9 Product recommendation types. Analytics with filter & search behavior report.
AI-powered personalized search, collection filter, and instant search with advanced analytics. Improve site conversion rates with advanced AI-powered search and collection filters. Return the best-matching products based on data attributes and context-aware analysis. Automatically detect the size, color, pricing, etc. Our app understands customer intent, extracts meaning from queries, and provides a high-quality balance of precision and recall. Our app works with any theme. Improve site conversion rates with advanced AI-powered search and collection filters. Return the best-matching products based on data attributes and context-aware analysis. Automatically detect the size, color, pricing, etc. Our app understands customer intent, extracts meaning from queries, and provides a high-quality balance of precision and recall. Our app works with any theme. more Cutting-edge AI-powered personalized search, collection filter, instant search Rule-based system to boost/bury products, merchandising & visitor segmentation Highly customizable UI & mobile ready solution. Lightning fast! Dynamic filters for collections, vendors, options, tags & metafields Powerful analytics
Increase sales with stylish, unlimited size charts and size guides that fit your brand design. Create a single size chart or as many as you need with SmartSize! Showcase stylish, professional size chart designs that seamlessly fit your store’s branding and enhance your customer experience. Effortlessly create and manage your size tables in minutes—no hidden fees. With mobile-responsive and customizable size chart solutions, help customers find their perfect fit, reduce returns, and boost sales. Enjoy multi-language support and advanced features for the ultimate size chart experience. Create a single size chart or as many as you need with SmartSize! Showcase stylish, professional size chart designs that seamlessly fit your store’s branding and enhance your customer experience. Effortlessly create and manage your size tables in minutes—no hidden fees. With mobile-responsive and customizable size chart solutions, help customers find their perfect fit, reduce returns, and boost sales. Enjoy multi-language support and advanced features for the ultimate size chart experience. more Highly customizable: Add images, brand colors, fonts, and adjust popup position. Content-rich: Size chart templates for clothing, shoes, jewelry, pets, and more. Responsive design: Size charts look perfectly on mobile, desktop, and tablets. Lightweight app: Installs easily and removes cleanly without leftover code. Advanced features: Multi-language size charts, tabs for multiple size guides.
Increase sales with personalized product recommendations & smart suggestions Smart Suggest Pro allows you to offer personalized product recommendations based on customer behavior. With smart suggestions and related product options, you can increase conversions and average order value (AOV). The app integrates seamlessly with your store, allowing easy customization. Display personalized recommendations across your store to engage customers and improve sales. Also, improve your customer shopping experience by showing relevant product suggestions at the right time Smart Suggest Pro allows you to offer personalized product recommendations based on customer behavior. With smart suggestions and related product options, you can increase conversions and average order value (AOV). The app integrates seamlessly with your store, allowing easy customization. Display personalized recommendations across your store to engage customers and improve sales. Also, improve your customer shopping experience by showing relevant product suggestions at the right time more Suggest related & personalized products based on customer behavior. Display custom product recommendations throughout your Shopify store. Boost AOV with smart suggestions and tailored product options. Seamlessly integrate with your theme for a smooth shopping experience. Easily customize recommendation blocks for personalized user journeys.
Boost your sales and AoV with personalized & smart product recommendations, bundles, and promotions. Improve sales with smart recommendations, product bundles, and promotions with Lucid. It's easy to use, fast, and customizable, allowing you to bring Amazon-like features to your store and upsell like a pro. Customize the designs to match your store aesthetics and easily add discounts to your product bundles and promoted products for flash sales. Plus, with support for localization, you can upsell across the world. Don't miss out on boosting your sales and offering a personalized experience. Improve sales with smart recommendations, product bundles, and promotions with Lucid. It's easy to use, fast, and customizable, allowing you to bring Amazon-like features to your store and upsell like a pro. Customize the designs to match your store aesthetics and easily add discounts to your product bundles and promoted products for flash sales. Plus, with support for localization, you can upsell across the world. Don't miss out on boosting your sales and offering a personalized experience. more Effortless Setup: Associate, Choose Type, Customize Design to Match Store Design Experience the Power of Variant Options-Controlled Recommendations and Bundles Product Recommendations: Related Products, Shop the Look & Trending Products Product Bundles: Frequently Bought Together, Complementary Products & Discounts Product Promotion: Product Advertising, Flash Sales, Deals & Discounts
Promotion Popup: Easily set up a nice discount pop ups in minutes with no technical requirements. Snake Promotion Popup (Discount pop ups, Email Sign Up, Newsletter Pop Up, Email Pop Ups, Countdown timer popup, coupon) is a solution for any store to promo your sales. With a wide range of popup types, conditions/display option, and events (Basic Popup, Email popup, Countdown popup or Image Popup). Snake Promotion Popup helps you create high converting, promotional and informative popups, increase conversion rates and boost sales while reaching your marketing goals. Snake Promotion Popup (Discount pop ups, Email Sign Up, Newsletter Pop Up, Email Pop Ups, Countdown timer popup, coupon) is a solution for any store to promo your sales. With a wide range of popup types, conditions/display option, and events (Basic Popup, Email popup, Countdown popup or Image Popup). Snake Promotion Popup helps you create high converting, promotional and informative popups, increase conversion rates and boost sales while reaching your marketing goals. more Easily set up a nice discount pop ups in minutes with no technical requirements Countdown creates urgency and provides discount codes to help increase sales Helps collect email lists of potential customers to help you easily promotions Display options. Export subscribers. Auto response to subscribe. Shopify customer sync. Email integration (Mailchimp, Klaviyo, Omnisend)
Let customers upload their pictures, select the frame, select size and show real-time preview Enhance your user experience by showing your customers real time preview of their uploaded images with various frame, select size for each image, crop, apply filter and choose from multiple matte options and let customers visualize their personalized frames live. Enhance your user experience by showing your customers real time preview of their uploaded images with various frame, select size for each image, crop, apply filter and choose from multiple matte options and let customers visualize their personalized frames live. more Add multiple frame colors- Allow frames in various colors like black, white etc. Add multiple frame sizes Image filters and Matte options
Upsell with TikTok, Instagram Feeds, Reels & UGC videos as Shoppable Videos. Build trust and loyalty Socialwidget (Instafeed PRO) - Display Instagram content — photos, videos & carousels on your store, converting social media posts into engaging product showcases. Socialwidget empowers you to create shoppable Instagram feeds that allow customers to shop directly from your posts, maximizing sales opportunities. Easily match your brand with custom social media feeds using our ready-made templates, optimized for all devices. Build trust, credibility, and smooth shopping experiences! Socialwidget (Instafeed PRO) - Display Instagram content — photos, videos & carousels on your store, converting social media posts into engaging product showcases. Socialwidget empowers you to create shoppable Instagram feeds that allow customers to shop directly from your posts, maximizing sales opportunities. Easily match your brand with custom social media feeds using our ready-made templates, optimized for all devices. Build trust, credibility, and smooth shopping experiences! more Create Instagram feeds on your website to increase social proof and engagement Tag products in Instagram media to make them shoppable on your store Show social media posts (photos & videos) with eye-catching layouts Sort posts from Instagram hashtags and public accounts to easily organize feeds Automatically drive fresh new content with auto-updating posts & videos
Improve conversion rates with monthly payment white label on-site messaging. As Splitit is completely different to all other buy now, pay later providers, it’s important to communicate to your shoppers that they can pay in installments, while they are still browsing your site. Flexible payment options can be the difference, and our white-label On-site messaging app integrates seamlessly across your site, offering tailored messages, transparent pricing, and banners. Leverage white-label customization for a stronger brand presence. As Splitit is completely different to all other buy now, pay later providers, it’s important to communicate to your shoppers that they can pay in installments, while they are still browsing your site. Flexible payment options can be the difference, and our white-label On-site messaging app integrates seamlessly across your site, offering tailored messages, transparent pricing, and banners. Leverage white-label customization for a stronger brand presence. more With our app you can let your shoppers know they can pay with installments. Communicate the benefits of paying over time throughout your customers journey. Splitit consistently delivers a positive ROI, especially with high-dollar items.
Product color swatches help customers choose the correct product. Using the Product color swatches app you can easily create multiple groups with different colors and custom images. Product swatches can be a single-color, two-color, product image, custom image, and pill text. App swatches group instantly loads on the product page and doesn’t slow down your product page. The app works with all types of themes. Using the Product color swatches app you can easily create multiple groups with different colors and custom images. Product swatches can be a single-color, two-color, product image, custom image, and pill text. App swatches group instantly loads on the product page and doesn’t slow down your product page. The app works with all types of themes. more Mange group with multiple product style swatches. Create single-color, two-color, custom image, product image, or pill swatches. Customize swatch label, out-of-stock, shape, and button style in appearance.
Leverage cart upsell offers to encourage customers to buy more: discount products, BOGO & free gift. Create cart upsell offers like Buy One Get One, free gifts, and custom discounts! Show customers an upsell popup after they click "Add to Cart," encouraging quicker purchases. Use Shopify AI for automatic upsell recommendations or set them up manually. Easily choose products for upsells and set conditions for applying offers. Boost sales with targeted, attention-grabbing upsell offers! Create cart upsell offers like Buy One Get One, free gifts, and custom discounts! Show customers an upsell popup after they click "Add to Cart," encouraging quicker purchases. Use Shopify AI for automatic upsell recommendations or set them up manually. Easily choose products for upsells and set conditions for applying offers. Boost sales with targeted, attention-grabbing upsell offers! more All kinds of upsell ideas to implement, from BOGO to free gifts. Advanced real-time analytics. Track your upsell campaigns to optimize offers. Fully customizable design. Adjust the popup to match your store theme. Smart upsell suggestions based on Shopify AI algorithms. Easy to set up. Create offers in minutes and start selling more right away.
Recover Lost Sales and Boost AOV with a Sticky Add to Cart That Converts Stop losing shoppers mid-scroll. Keep your “Add to Cart” button always visible on product pages, home, or collections so customers never forget to buy. Easy to customise, fully responsive, and proven to increase conversions and average order value (AOV). Stop losing shoppers mid-scroll. Keep your “Add to Cart” button always visible on product pages, home, or collections so customers never forget to buy. Easy to customise, fully responsive, and proven to increase conversions and average order value (AOV). more Sticky Add to Cart — Visible on scroll to boost conversions! Seamless Customisation — Branding, Display, Texts, Features. Homepage Display — Turn homepage traffic into sales. Optimised UX — A seamless cart experience across all devices. Smart Add-ons: Variants, quantities, translations, scroll triggers, and more.
When the customer scrolls the page, Sticky ATC makes potential users pay attention to your products. Increase your revenue by having a smart sticky product bar, which will make potential customers pay attention to your products. Our Sticky Add To Cart app will know when the customer tends to scroll up & is looking to add product to the cart. It appears at just the right time, in the right place. This is for the ultimate convenience while still keeping customers focused on the main contents, like description, features…etc. you can modify everything you want to match your online store perfects. Increase your revenue by having a smart sticky product bar, which will make potential customers pay attention to your products. Our Sticky Add To Cart app will know when the customer tends to scroll up & is looking to add product to the cart. It appears at just the right time, in the right place. This is for the ultimate convenience while still keeping customers focused on the main contents, like description, features…etc. you can modify everything you want to match your online store perfects. more Modify everything you want to match your online store perfectly. Auto encloses to any themes, including the most popular themes on the market. Sticky Add to Cart button behavior can same as the default product add to cart Homepage and Support multi stores, currencies, and languages (Automatically) Fast CDN based performance + Integrate with google analytics
Keep add-to-cart button always visible for a faster checkout process! With our Sticky Cart app, you can keep your cart always visible on your store, reducing abandoned carts and increasing sales. Our app allows you to add a sticky cart to your store, making it easier for customers to access and edit their cart while they shop. Plus, our app is easy to use and integrates seamlessly with your existing store, so you can start improving your sales and reducing abandoned carts right away. Keep your cart always visible and increase sales with our Sticky Cart app. With our Sticky Cart app, you can keep your cart always visible on your store, reducing abandoned carts and increasing sales. Our app allows you to add a sticky cart to your store, making it easier for customers to access and edit their cart while they shop. Plus, our app is easy to use and integrates seamlessly with your existing store, so you can start improving your sales and reducing abandoned carts right away. Keep your cart always visible and increase sales with our Sticky Cart app. more Make it easier for customers to access their cart. Enable Fast checkout, increase conversion rate. Easy customization with settings built-in to your store's Theme Editor. Track clicks, get insights into customers' behavior. No impact on website speed, compatible with Online Store 2.0.
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.