Powerful Slide Cart With Cart Upsell, Free Gifts, Rewards Bar & Post Purchase Upsell to Boost Sales Leverage a slide cart drawer, equipped with a powerful tiered rewards progress bar and post-purchase upsell scenarios. Encourage customers to add more products and receive rewards like free shipping, free gifts, and discounts. Tailor product recommendations with smart cart upsell rules to maximize every opportunity to optimize your AOV. Create an easy shopping experience and reduce cart abandonment by moving customers faster to checkout. Leverage a slide cart drawer, equipped with a powerful tiered rewards progress bar and post-purchase upsell scenarios. Encourage customers to add more products and receive rewards like free shipping, free gifts, and discounts. Tailor product recommendations with smart cart upsell rules to maximize every opportunity to optimize your AOV. Create an easy shopping experience and reduce cart abandonment by moving customers faster to checkout. more Slide Cart: Cart with tiered rewards - free shipping, free gift, and discounts Cart Upsell: Recommended products in-cart based on AI or custom rules Post Purchase Upsell: optimize AOV with one click upsell offers in post-checkout Advanced Cart Features: Shipping protection upsell, custom HTML, custom widgets Easy Customization: No coding, no wait. Get live chat superior support
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
The simplest app to display your IG posts and reels! Takes less than a minute to set up. If you're looking for a simple, set-and-forget app to show your Instagram posts on your Shopify store, look no further! This delightful app lets you add an Instagram gallery on your website in less than a minute, no coding required. If you're looking for a simple, set-and-forget app to show your Instagram posts on your Shopify store, look no further! This delightful app lets you add an Instagram gallery on your website in less than a minute, no coding required. more Takes less than a minute to set up Choose from 3 beautiful designs: grid, collage, and slider (carousel) Supports normal posts and reels Looks great on mobile and desktop Highly optimized widget that won't slow down your store
Improve your store design with beautiful photo collections created by ANG photo gallery. ANG Photo Gallery enables effortless and swift creation of stunning photo galleries. With a wide array of customization options at your disposal, such as layout, color schemes, visual effects, and page selection, you can tailor your collection to perfection. ANG photo gallery is modernly designed, highly compatible with a variety of screens and devices. You can also boost sales of products tagged with photos in your gallery. ANG Photo Gallery enables effortless and swift creation of stunning photo galleries. With a wide array of customization options at your disposal, such as layout, color schemes, visual effects, and page selection, you can tailor your collection to perfection. ANG photo gallery is modernly designed, highly compatible with a variety of screens and devices. You can also boost sales of products tagged with photos in your gallery. more Easily create galleries with unlimited photos. Optimized photos. Upload photos in bulk, customize effects, colors, layout. Make it easy for shoppers to buy products with products tagged on photos. Mobile-first responsive.
A simple solution to create mega menu, tab menu or tree menu for store. Transform your store navigation with Extra Menu — the all-in-one menu builder. Create Mega Menus, Tab Menus, Tree Menus, Contact Forms, Countdown Timers, Breadcrumbs and more — using ready-made templates and an intuitive editor. Multi-Menu & Smart Targeting — Build multiple menus and publish each to specific markets, desktop, or mobile. Perfect for global stores needing localized, device-optimized navigation. No coding required. Fully customizable. Beautifully responsive. Transform your store navigation with Extra Menu — the all-in-one menu builder. Create Mega Menus, Tab Menus, Tree Menus, Contact Forms, Countdown Timers, Breadcrumbs and more — using ready-made templates and an intuitive editor. Multi-Menu & Smart Targeting — Build multiple menus and publish each to specific markets, desktop, or mobile. Perfect for global stores needing localized, device-optimized navigation. No coding required. Fully customizable. Beautifully responsive. more Create mega menu, tab menu and tree menu (dropdown menu) by using template. Simple and fast customization. Vertical menu. Multi-language + Limit markets + Limit pages + breadcrumbs + Schedule menu item Mobile friendly.
The All-in-One Announcement Solution for Your Store! The All-in-One Announcement Solution for Your Store! With Annify, capturing your customers' attention has never been easier. Create eye-catching announcement bars to share promotions, updates, and important messages directly on your Shopify store. Annify is designed to be fast, flexible, and easy to customize for any type of store. The All-in-One Announcement Solution for Your Store! With Annify, capturing your customers' attention has never been easier. Create eye-catching announcement bars to share promotions, updates, and important messages directly on your Shopify store. Annify is designed to be fast, flexible, and easy to customize for any type of store. more Fixed bar stays visible while scrolling for consistent messaging. Marquee-style bar with scrolling text to capture customer attention. Sliding bar rotates multiple messages for seamless updates. Smooth animations enhance sliding and marquee announcement bars. Page & geo targeting: show announcements by page and visitor location
Announcement bars & countdown timers that drive sales — on any page. Grab attention with on-brand announcement bars. Choose five bar types — simple, rotating, news ticker, typewriter, and countdown — to run sales, free-shipping offers, and news on any page. Countdown timers add urgency with flip-clock, box, or circle styles, then show a fallback message when time runs out. Schedule bars ahead, target them by page, and show different messages per market or language. A/B test your wording and keep the winner. Installs in one click and survives theme updates. Grab attention with on-brand announcement bars. Choose five bar types — simple, rotating, news ticker, typewriter, and countdown — to run sales, free-shipping offers, and news on any page. Countdown timers add urgency with flip-clock, box, or circle styles, then show a fallback message when time runs out. Schedule bars ahead, target them by page, and show different messages per market or language. A/B test your wording and keep the winner. Installs in one click and survives theme updates. more Five bar types: simple, rotating, news ticker, typewriter, and countdown Countdown timers with flip-clock, box, circle, and minimal styles Schedule start and end dates, or run recurring weekly campaigns Target bars by page; show regional variants per market or language A/B test your message, track click rate, and keep the winner
Helps users to compare two images of before and after with slider separation directly as Apps block Before - After & Comparison by Apps on Demand provides you option for adding the image for comparison for showing the before/after images for the products or services they provides. Directly shown as section in the customize which makes it a perfect fit for Shopify 2.0 themes. It fully customizable from theme editor and requires no coding skills. The app is ideal fit for any industry that want to show before and after images of their products or services that will eventually uplift sales. Before - After & Comparison by Apps on Demand provides you option for adding the image for comparison for showing the before/after images for the products or services they provides. Directly shown as section in the customize which makes it a perfect fit for Shopify 2.0 themes. It fully customizable from theme editor and requires no coding skills. The app is ideal fit for any industry that want to show before and after images of their products or services that will eventually uplift sales. more Add multiple sections with option of show either 1, 2 or 3 images in a row. Fully customizable settings. Desktop and Mobile Compatible. Compare two images
Add Button to External links - Amazon, Walmart, Ebay | Affiliate links, Any custom links AOD External Links Button will allow you to easily add external affiliate link buttons on product page. As you know customer always search for good price on another websites. In our app you can add affiliate links of your products from website like Amazon, Ebay, Jet, Aliexpress etc. so you do not loose your sales and users will see only your product on different platforms. You can add unique affiliate links for each product. We also provide an option to hide "Add to cart" button. AOD External Links Button will allow you to easily add external affiliate link buttons on product page. As you know customer always search for good price on another websites. In our app you can add affiliate links of your products from website like Amazon, Ebay, Jet, Aliexpress etc. so you do not loose your sales and users will see only your product on different platforms. You can add unique affiliate links for each product. We also provide an option to hide "Add to cart" button. more The app installation process is extremely easy & it does not require manual code Add External links buttons for Unlimited Products. Replace & Hide Add to Cart. Show External links button on product, collection page & home page products. Increase Sales by adding affiliate link buttons. Boost your buyer confidence. You can customize the button style according to your theme design.
Product Options override variants limit and can create multiple addons with custom price With Product Options you can create multiple options such as text, drop-down, radio, checkbox, date & time, swatches with custom price add-ons. This will help you to collect more important information of your products and will help you increase in sale. The app installation is very easy following creating product options and assigning them to either collections or products. Rely us for getting more product information from users through options for better selling of your products. With Product Options you can create multiple options such as text, drop-down, radio, checkbox, date & time, swatches with custom price add-ons. This will help you to collect more important information of your products and will help you increase in sale. The app installation is very easy following creating product options and assigning them to either collections or products. Rely us for getting more product information from users through options for better selling of your products. more One click install & no coding skills required / 2.0 Compatible Unlimited Variants Options | Swatches | Date & Time Dropdown | Checkboxes | Short Text | Long Text | Radio | File Upload Ajax Cart Compatibility with Shopify Discounts on Addon Priced Checkouts Mixed Cart with custom priced add-ons and normal product
Upgrade your cart with a high-converting slide cart, upsells, and smart rewards. A sleek, powerful slide cart drawer for your store, helping shoppers discover relevant products before checkout. Use cart upsells, free shipping bars, cart rewards, and more to encourage larger purchases and increase average order value. Ask Shopify Sidekick to check your cart setup or turn features on without opening the dashboard. Set up in under 5 minutes, no coding, works with most themes and 13 languages. Our live chat 24/7 support team is always ready to help. A sleek, powerful slide cart drawer for your store, helping shoppers discover relevant products before checkout. Use cart upsells, free shipping bars, cart rewards, and more to encourage larger purchases and increase average order value. Ask Shopify Sidekick to check your cart setup or turn features on without opening the dashboard. Set up in under 5 minutes, no coding, works with most themes and 13 languages. Our live chat 24/7 support team is always ready to help. more High-converting slide cart drawer to reduce cart abandonment Upsells picked by AI from what your shoppers actually buy together Free shipping bar to increase cart value and motivate spending Cart rewards, add-ons, and discounts to boost average order value Check your cart setup and turn features on from Shopify Sidekick
Sell more, do less with AI-powered strategies for free gift with purchase, BOGO, Buy X Get Y Unlock higher AOV with AI-powered insights that quickly recommend the right campaigns and guide shopper behavior at key moments. Set up multiple promotion types with ease: BOGO (Buy One Get One), Free Gift with Purchase, and Buy X Get Y. Deliver gifts online and in-store with Shopify POS. Highlight promotions through multiple widgets that auto-translate into your customer's language. Fully compatible with Shopify discount codes and themes. A/B test your offers and live chat support 24/7 Unlock higher AOV with AI-powered insights that quickly recommend the right campaigns and guide shopper behavior at key moments. Set up multiple promotion types with ease: BOGO (Buy One Get One), Free Gift with Purchase, and Buy X Get Y. Deliver gifts online and in-store with Shopify POS. Highlight promotions through multiple widgets that auto-translate into your customer's language. Fully compatible with Shopify discount codes and themes. A/B test your offers and live chat support 24/7 more Run free gift with purchase, BOGO, and Buy X Get Y from one app AI translates your widgets into your customer's language Motivate higher spend with milestone rewards, tiered reward box, deal of the day Advanced rule: Gift limit, Multiplier, Schedule, Checkout upsell (Shopify Plus) Design every widget to match your brand colors with AI-powered theme matching
Custom product options & variants: product customizer with file upload, price calculator & add-ons Go beyond Shopify native product option limits. Create option sets to apply across products or add product-level options. Dynamically update product price based on the options the shopper selects. From swatches to file uploads & dimensional formula-based price calculator, build product options that fit any configuration. Build multi-step flows, add advanced rules like show/hide. Bulk edit to manage large catalogs fast. Bundle upsells as product add-ons to grow AOV. No-code setup. Go beyond Shopify native product option limits. Create option sets to apply across products or add product-level options. Dynamically update product price based on the options the shopper selects. From swatches to file uploads & dimensional formula-based price calculator, build product options that fit any configuration. Build multi-step flows, add advanced rules like show/hide. Bulk edit to manage large catalogs fast. Bundle upsells as product add-ons to grow AOV. No-code setup. more Unlimited product options & variant options: option sets + product-level options 31 option types: swatches, dropdown, buttons, text, range slider & file upload Dimensional price calculator: formula pricing by width / height / length Add-on products for upsells, bundles and cross-sells Conditional rules (show/hide) + multi-step flows, bulk add/edit & localization
Build personality tests, product quizzes, and trivia to engage shoppers and increase conversions. Appify helps merchants create unlimited quizzes without coding to boost sales and engagement. Build product recommendation quizzes that guide customers to perfect matches, personality tests that go viral on social media.Collect valuable customer data with customizable lead forms, use conditional logic for personalized results, and track performance with built-in analytics. Choose from 9 question types, mobile-responsive themes, and integrate with email marketing tools to grow your list. Appify helps merchants create unlimited quizzes without coding to boost sales and engagement. Build product recommendation quizzes that guide customers to perfect matches, personality tests that go viral on social media.Collect valuable customer data with customizable lead forms, use conditional logic for personalized results, and track performance with built-in analytics. Choose from 9 question types, mobile-responsive themes, and integrate with email marketing tools to grow your list. more Create engaging quizzes with 9 question types to boost customer interaction. Match quizzes to your store's look with customizable colors, fonts, and themes. Collect customer emails and sync to Mailchimp, Klaviyo, and other email tools. Track completion rates and customer behavior to optimize quiz performance. Shuffle questions and answers to keep quizzes fresh for returning customers.
Take booking for events, appointments, services on your calendar. Calendar Appointment Booking App. Add "Book Now" on any product or service. Convert any product into a booking service in 3 easy steps, just add the product to the app, assign team members, and then schedule availability. App will add a scheduling button on the product to let customers book appointments. Works like Calendly, to take booking on products. Schedule appointment booking seamlessly, whether in-person or online, with automated Zoom integration. Add staff members to set up accounts and access to their dashboard. Add "Book Now" on any product or service. Convert any product into a booking service in 3 easy steps, just add the product to the app, assign team members, and then schedule availability. App will add a scheduling button on the product to let customers book appointments. Works like Calendly, to take booking on products. Schedule appointment booking seamlessly, whether in-person or online, with automated Zoom integration. Add staff members to set up accounts and access to their dashboard. more Flexible Setup: Calendar Integrations, Custom Questions, Group Events & more Team Member Support: Add your staff as team members for taking multiple booking Google/Outlook calendar integrations. Connect Zoom or Google Meet for meetings. Appointments cancellation & rescheduling flow without manual intervention. Deposits: Allow Customers to pay a deposit amount while booking the appointment.
Take bookings, appointments, events & service on your calendar. Booking app for any appointment. Appointo app adds a native scheduling popup on any service/product you sell on Shopify. Start selling services in your store within 2 min without any technical knowledge. Works like Calendly, but integrated into Shopify. You can sell in your physical location or online using automated zoom or google meet links. Ask custom questions to your customers also add multi-day on your site, for tours, hotel, Boat rental, car rental, etc. Appointo app adds a native scheduling popup on any service/product you sell on Shopify. Start selling services in your store within 2 min without any technical knowledge. Works like Calendly, but integrated into Shopify. You can sell in your physical location or online using automated zoom or google meet links. Ask custom questions to your customers also add multi-day on your site, for tours, hotel, Boat rental, car rental, etc. more Customer Booking Portal through which customers can manage their bookings Sends automated emails and text for reminders, confirmations, rescheduling, etc. Supports group appointments, Google, Outlook calendar and Zoom Integrations. Supports all themes and automatically translates to the store's language. Manage one-time and recurring booking subscriptions including payments
Appointment booking & calendar app for services, events & classes. Booking app & appointment app. This appointment app transforms any product into a bookable service or event in under 1 min! The Propel booking app adds a scheduling popup to product pages to take appointments & bookings for services, events, courses, reservations & workshops. Similar to Calendly, with a beautiful mobile-first design, Zoom & Google Calendar integration, SMS reminders, deposits, group appointments & more, the Propel appointment booking app will help you sell more bookings, stay organized & reduce no-shows. This appointment app transforms any product into a bookable service or event in under 1 min! The Propel booking app adds a scheduling popup to product pages to take appointments & bookings for services, events, courses, reservations & workshops. Similar to Calendly, with a beautiful mobile-first design, Zoom & Google Calendar integration, SMS reminders, deposits, group appointments & more, the Propel appointment booking app will help you sell more bookings, stay organized & reduce no-shows. more Use group appointments to offer classes, webinars, events & more. Reduce no-shows, ask for reviews and more with SMS and email notifications. Add custom questions to your booking form to gather the info you need. Easily take deposits and partial payments to secure bookings. Zoom integration auto creates meeting URLs. Integrates with Google Calendar.
Turn products into appointments. Set flexible time slots and manage bookings easily AptBook lets you accept appointments directly from your Shopify store in just 1 minute. Perfect for salons, spas, clinics, doctors, coaches, workshops, classes, and service-based businesses. Turn products into bookable services with flexible time slots, custom durations, buffer time, and holiday controls. Customers can book instantly from your homepage. Sync with Google Calendar and host video calls via Zoom or Agora. Setup in 3 simple steps and start accepting bookings today. AptBook lets you accept appointments directly from your Shopify store in just 1 minute. Perfect for salons, spas, clinics, doctors, coaches, workshops, classes, and service-based businesses. Turn products into bookable services with flexible time slots, custom durations, buffer time, and holiday controls. Customers can book instantly from your homepage. Sync with Google Calendar and host video calls via Zoom or Agora. Setup in 3 simple steps and start accepting bookings today. more Offer customers seamless booking from product page to checkout in seconds. Set working hours, breaks, holidays & full control over your availability. Add Zoom URL and Google Meet Link to Connect for online meetings Replace the "add to cart" button for a "book now" button on any product page Booking an Appointment: You schedule the video call by selecting a time slot.
Timers, email sign ups, custom CSS, advanced page targeting and much more. Connect with your customers, push promotions and drive sales with discounts and offers all without development time. Get ready for the sales seasons ahead and push your sales or capture additional email leads all in one place packed with features. You can create a banner in less than 30 seconds and have it shown across your whole website. Custom CSS is included in the entry tier so match your banners to your brand easily. Connect with your customers, push promotions and drive sales with discounts and offers all without development time. Get ready for the sales seasons ahead and push your sales or capture additional email leads all in one place packed with features. You can create a banner in less than 30 seconds and have it shown across your whole website. Custom CSS is included in the entry tier so match your banners to your brand easily. more Auto-schedule banners to go live when you like automatically. Drive email signups by offering discounts for signing up. Set countdown timers to push urgency of your messaging and offers. Advanced display rules to show different banners on certain pages. Custom CSS is available for all merchants to match your brand.
Inform with clear delivery dates. Answer "When will it arrive?" and elevate trust. Try now! Merchants can enhance the shopping experience with AppRoom Estimated Delivery Day. This app allows stores to display EDD (Estimated Delivery Date) and ETA (Estimated Time of Arrival) on product pages. It provides accurate EOD (End of Day) estimates, setting clear delivery expectations. The result? Fewer customer inquiries and a stronger trust bond between merchant and shopper. Merchants can enhance the shopping experience with AppRoom Estimated Delivery Day. This app allows stores to display EDD (Estimated Delivery Date) and ETA (Estimated Time of Arrival) on product pages. It provides accurate EOD (End of Day) estimates, setting clear delivery expectations. The result? Fewer customer inquiries and a stronger trust bond between merchant and shopper. more One-click setup via Shopify Theme Editor: simple, no coding needed. "Get It By" countdown for urgency: adjust messages and colors. Control timer display: show/hide on specific days and omit weekends/holidays. Clear delivery info reduces support, boosts sales. Boost sales with urgent delivery timers for high-demand products.
Product Options built for complex products. Guide complex choices with clarity. Build complex product configurations with 30+ option types, conditional logic, add-on pricing, file uploads and live personalization. Reuse option sets, manage shared SKU and inventory workflows, and keep custom choices synced from cart to confirmation. Connect option data to Draft Orders, POS, API and business workflows—with 24/7 human support and hands-on help from our development team. Build complex product configurations with 30+ option types, conditional logic, add-on pricing, file uploads and live personalization. Reuse option sets, manage shared SKU and inventory workflows, and keep custom choices synced from cart to confirmation. Connect option data to Draft Orders, POS, API and business workflows—with 24/7 human support and hands-on help from our development team. more Build complex product options with 30+ flexible input types. Use conditional logic, add-on pricing, file uploads & personalization. Reuse option sets and manage shared SKU & inventory workflows. Keep custom choices synced from cart to orders, emails & packing slips Get 24/7 human support with hands-on help from our dev team
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.