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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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Match shoppers to the right products instantly, powered by personalised recommendation quizzes Quiz Buddy lets merchants build product recommendation quizzes in minutes, no coding needed. Ask shoppers a few questions, then surface the products or bundles that actually match their needs. Shoppers get matched to the right products on a branded results page, boosting confidence at purchase. Works for any niche: skincare, supplements, fashion, snowboards, and more. Boost average order value, reduce returns, and keep shoppers engaged longer. Quiz Buddy lets merchants build product recommendation quizzes in minutes, no coding needed. Ask shoppers a few questions, then surface the products or bundles that actually match their needs. Shoppers get matched to the right products on a branded results page, boosting confidence at purchase. Works for any niche: skincare, supplements, fashion, snowboards, and more. Boost average order value, reduce returns, and keep shoppers engaged longer. more No-code quiz builder go live in minutes, no developer needed Match shoppers to the right products using weighted answer scoring Reward quiz takers with a discount code to incentivize their first purchase Run multiple quizzes by product, collection, or your whole store See completion rates, top results, and revenue driven by each quiz

0.0(Reviews)

Create product recommendation Quiz. Collect leads and increase revenue through personalized results. Quizify is a web-powered quiz builder that allows e-commerce stores to deliver personalized product recommendations to their customers. Often, customers leave the website without a purchase because they cannot settle on the right product. Online shoppers need guidance in finding what they want, just like in real shops. With Quizify, you can ask questions, analyze their responses, and recommends the right products for them. Understand customers’ needs and create higher ROI marketing campaigns. Quizify is a web-powered quiz builder that allows e-commerce stores to deliver personalized product recommendations to their customers. Often, customers leave the website without a purchase because they cannot settle on the right product. Online shoppers need guidance in finding what they want, just like in real shops. With Quizify, you can ask questions, analyze their responses, and recommends the right products for them. Understand customers’ needs and create higher ROI marketing campaigns. more Easy to use, super user friendly Quiz builder design! Attractive quiz templates. Increase sales & decrease returns by finding right product your customers need. Direct, Tag, Score and Type based product recommendation to cover all your needs Conditional logic - Automatically jump, show, or hide questions based on answers Powerful analytics and actionable insights to target customer with accurate data

4.6(Reviews)

Convert more with tailored product recommendation quizzes powered by AI, surveys and giveaways. Turn browsers into buyers with interactive quizzes that offer prizes and personalized product matches. Create compelling giveaway contests in minutes with our drag-and-drop quiz builder. Merchants can easily set up product-matching quizzes that reward participation with special offers, discounts, or free products. Perfect for beauty fit quizzes, style assessments, and product discovery contests. Boost engagement, capture leads, and increase conversions while gathering valuable customer insights. Turn browsers into buyers with interactive quizzes that offer prizes and personalized product matches. Create compelling giveaway contests in minutes with our drag-and-drop quiz builder. Merchants can easily set up product-matching quizzes that reward participation with special offers, discounts, or free products. Perfect for beauty fit quizzes, style assessments, and product discovery contests. Boost engagement, capture leads, and increase conversions while gathering valuable customer insights. more Create engaging giveaway quizzes with drag-and-drop simplicity Drive higher engagement with customizable rewards, discounts, and giveaways Seamlessly integrate with your existing store design and product catalog

0.0(Reviews)

Add an I agree to terms and conditions checkbox on the cart page/ drawer cart & record consent. Add a T&C checkbox to the cart in 1 click. Customers are required agree to the terms to checkout. This cart checkbox allows you to add a refund policy, shipping policy, terms at checkout, agree box, age verify, and request consent for the general conditions of sale. Accept terms of acknowledgment & create a checkout terms and conditions box, a required checkbox/ mandatory checkbox at checkout. Terms box previously known as “EZ Terms and Conditions Checkbox”. Consent Checkbox. Terms Check Box Add a T&C checkbox to the cart in 1 click. Customers are required agree to the terms to checkout. This cart checkbox allows you to add a refund policy, shipping policy, terms at checkout, agree box, age verify, and request consent for the general conditions of sale. Accept terms of acknowledgment & create a checkout terms and conditions box, a required checkbox/ mandatory checkbox at checkout. Terms box previously known as “EZ Terms and Conditions Checkbox”. Consent Checkbox. Terms Check Box more Adds a check box to cart for agreement, TOS, cart terms, EULA, and return policy Checkout checkbox works with express checkout: PayPal, Apple Pay, and Shop Pay Logs date & time when the I agree to terms checkbox is checked before checkout Terms & Conditions box: terms of service, privacy policy, policies, contracts. Ensures security & privacy and compliance with age check and agree terms check

4.9(Reviews)

Raveo helps you to display video reviews and your tiktok videos in a tiktok like feed Raveo helps you to easily include your TikTok videos or the videos by your customers in your online store easily.You can easily create a TikTok video gallery and embed it in your store. Your customers can view and see products related to this video and increase the trust of your customers. Raveo helps you to easily include your TikTok videos or the videos by your customers in your online store easily.You can easily create a TikTok video gallery and embed it in your store. Your customers can view and see products related to this video and increase the trust of your customers. more Import Tiktok videos Tag products in the video Extremely fast & responsive in all screens

5.0(Reviews)

The only Search & Discovery app powered by Google Product search and discovery is one of the most important website experiences, but it can be very difficult. Google's AI Commerce Search is an enterprise solution that increases conversions and reduces search abandonment without needing to become an expert in machine learning or AI. Retail Cloud Connect by Nimstrata, a certified Google Cloud partner, syncs your Shopify catalog with Google Cloud and returns world-class AI-powered search, browse, and recommendations on your storefront in minutes. Product search and discovery is one of the most important website experiences, but it can be very difficult. Google's AI Commerce Search is an enterprise solution that increases conversions and reduces search abandonment without needing to become an expert in machine learning or AI. Retail Cloud Connect by Nimstrata, a certified Google Cloud partner, syncs your Shopify catalog with Google Cloud and returns world-class AI-powered search, browse, and recommendations on your storefront in minutes. more Enable all Google Cloud AI Commerce Search solutions with one app Maintain full control of your data and merchandising settings in Google Cloud Simplify merchandising efforts by adding AI browsing to your collection pages Install quickly on your existing Shopify Online Store 2.0 themes with App Blocks Leverage pre-built CSS classes for easy customization to match your branding

5.0(Reviews)

AI-powered product recommendations & search: cart, checkout, post-purchase upsells, and A/B testing Rebuy personalizes every step of the shopping journey with AI-powered upsells, cross-sells, and smart product discovery and merchandising tools. Our core packages — Cart & Merchandising, Checkout & Post Purchase, Search & Collections, and Flows & A/B Testing — help brands boost AOV and LTV. Plus, Rebuy Monetize unlocks new, incremental post-purchase profit! Grow faster with flexible no-code, low-code, and custom code solutions trusted by top Shopify stores to convert more and grow faster. Rebuy personalizes every step of the shopping journey with AI-powered upsells, cross-sells, and smart product discovery and merchandising tools. Our core packages — Cart & Merchandising, Checkout & Post Purchase, Search & Collections, and Flows & A/B Testing — help brands boost AOV and LTV. Plus, Rebuy Monetize unlocks new, incremental post-purchase profit! Grow faster with flexible no-code, low-code, and custom code solutions trusted by top Shopify stores to convert more and grow faster. more AI-powered search, end-to-end personalization, upsells, and cross-sells Smart Cart is an easily customizable, AI-powered, slide-out cart Data-fueled product recommendations in checkout and accelerated checkout Build engagement with Post-Purchase, Re-Order Landing Pages, and Smart Flows Industry-leading integrations through every step of the customer's journey

4.7(Reviews)

Let customers make order edits themselves to change address, cancel orders, edit cart items, etc Improve your post purchase customer experience by allowing them to edit orders right from the Thank You and Order Status pages. You have full control over what order editing you want to allow like address edits, replacing products, editing cart items and order cancellation. Recheck also helps you create post purchase upsell offers which can be shown on these pages and in emails to further increase your AOV. Best part? Recheck works out of the box with any 3PL / warehouse management software! Improve your post purchase customer experience by allowing them to edit orders right from the Thank You and Order Status pages. You have full control over what order editing you want to allow like address edits, replacing products, editing cart items and order cancellation. Recheck also helps you create post purchase upsell offers which can be shown on these pages and in emails to further increase your AOV. Best part? Recheck works out of the box with any 3PL / warehouse management software! more Let customers edit shipping address, change variant, products, shipping method Control the order editing duration & what your customers can edit in their order Set up post purchase upsell offers on the Thank You & Order Status pages. Edit orders to allow size / variant change and quick swap with price adjustment. Shopify Flow integration to enable complex order editing and marketing flows.

5.0(Reviews)

Add smart related products to your store. They match your theme, improve navigation and boost sales. Help your customers find what they are looking for and make them more likely to buy from you with smarter related products that are easy to install, fit your styles and significantly outperform themes-provided ones. Our app combines sales data and dozens of attributes to automatically show items that make sense to your customers and have the maximum effect on your conversions. It can also be fine-tuned to your specific needs. Check the impact on your sales with detailed conversion tracking. Help your customers find what they are looking for and make them more likely to buy from you with smarter related products that are easy to install, fit your styles and significantly outperform themes-provided ones. Our app combines sales data and dozens of attributes to automatically show items that make sense to your customers and have the maximum effect on your conversions. It can also be fine-tuned to your specific needs. Check the impact on your sales with detailed conversion tracking. more Add related products sections to your store directly from the theme editor. Customize the look, manually fine-tune the logic, or let us do it for you. Check the impact on your sales with detailed reporting and conversion data.

5.0(Reviews)

Quiz app to boost sales, grow your email list, and turn shoppers into buyers with product quizzes. Quiz Builder lets you create a personalized product recommendation quiz to help each customer find their ideal product. Turn product finder quizzes into your 24/7 online sales assistant. Whether it's a skin quiz(skincare quiz), style quiz, gift quiz, personality quiz, scored quiz, hair quiz, vitamin quiz, pet quiz or questionnaire, your customers deserve a personalized shopping journey. Product discovery quizzes are the best way to increase sales and get insights about your target market. Quiz Builder lets you create a personalized product recommendation quiz to help each customer find their ideal product. Turn product finder quizzes into your 24/7 online sales assistant. Whether it's a skin quiz(skincare quiz), style quiz, gift quiz, personality quiz, scored quiz, hair quiz, vitamin quiz, pet quiz or questionnaire, your customers deserve a personalized shopping journey. Product discovery quizzes are the best way to increase sales and get insights about your target market. more Build a product quiz, quiz funnel, and pop up quiz for your e-commerce shop. Style your quiz to match your store’s look— colors, fonts, images, and more. Use Logic Jump for dynamic paths and a Point System for custom recommendations. Create a personality test and questionnaire with custom result pages in minutes. 5 publish type: Inline Quiz, Popup Quiz, Quiz on Button Click, Separate Page etc

4.9(Reviews)

Show Related Products on any product , visitors always search for different colors and similar style * Now you can create new arrivals slider / grid. * You can showcase trending products. * Create hot products, featured products slider. * You can showcase all widgets (new arrivals, trending products and featured products) on homepage, collection page, product page, blog page, cart page. # You can customize Related Products * Number of Related Products in a row * Related Products Title , font size and color. * Customize price color , vendor color, product type color. * Now you can create new arrivals slider / grid. * You can showcase trending products. * Create hot products, featured products slider. * You can showcase all widgets (new arrivals, trending products and featured products) on homepage, collection page, product page, blog page, cart page. # You can customize Related Products * Number of Related Products in a row * Related Products Title , font size and color. * Customize price color , vendor color, product type color. more Related Products app can show Products from same collections , type , tags . The app checks the tags of current product and fetches the Products by tags New Features : Added new arrivals , trending products , hot products feature

4.9(Reviews)

Create a 1-Click COD order form with Upsells, Downsells & Offers to increase conversion rate and AOV With Releasit, customers can order instantly using a 1-Click COD form as a popup or advanced Cash on Delivery without Shopify Checkout. Build customizable COD forms with Upsells, Downsells, and Quantity Offers to increase AOV. Reduce fake orders with OTP phone verification (SMS/WhatsApp). Track events with Facebook, TikTok, Google, Pinterest & Snapchat. Sync orders to Google Sheets. Run A/B Tests on 1-Click Upsells to compare variants and performance. Multi-currency support via Shopify Markets. With Releasit, customers can order instantly using a 1-Click COD form as a popup or advanced Cash on Delivery without Shopify Checkout. Build customizable COD forms with Upsells, Downsells, and Quantity Offers to increase AOV. Reduce fake orders with OTP phone verification (SMS/WhatsApp). Track events with Facebook, TikTok, Google, Pinterest & Snapchat. Sync orders to Google Sheets. Run A/B Tests on 1-Click Upsells to compare variants and performance. Multi-currency support via Shopify Markets. more Fully customizable COD order form & layout (Popup/Embedded) with multi-currency Upsells (Pre/Post Purchase, One-Tick), Downsells, Quantity Offers & A/B Testing Track events automatically with Facebook, TikTok, Google, Pinterest, Snapchat Use Google Sheets, Google Autocomplete, discounts & abandoned checkouts recovery Phone verify with OTP, limit postal codes, block IPs & confirm via SMS/WhatsApp

4.9(Reviews)

Add custom fields on the cart page. Request the information you need to fulfill orders. With our app, you can easily add custom fields to your cart page, and optionally make them required. Customers won't be able to visit the checkout area unless they fill out the information you need. The captured information is saved with Shopify and available to you in the order page. It can also be exported, displayed in emails and order printouts etc. The app supports the newest theme format known as Online Store 2.0. With our app, you can easily add custom fields to your cart page, and optionally make them required. Customers won't be able to visit the checkout area unless they fill out the information you need. The captured information is saved with Shopify and available to you in the order page. It can also be exported, displayed in emails and order printouts etc. The app supports the newest theme format known as Online Store 2.0. more Field types: Text, Number, Checkbox, Radio, Dropdown, Combobox, and Text area. Simple drag and drop install process, built into the Theme Editor. Field data is saved in Shopify and easily accessible on the order page. Efficient code served from Shopify's servers — minimal impact on store speed. Captured information can be exported and displayed using Liquid code.

5.0(Reviews)

Custom-fit your sales with dynamic, easy-to-edit and personalized size charts. Retailed Size Chart & Guide is your key to reducing returns and boosting conversions. Designed for Shopify merchants, our app empowers you to create tailored size charts with no coding required. Whether you're selling sneakers, apparel, accessories, or bespoke items, our solution simplifies size guidance, ensuring your customers find their perfect fit. Reduce sizing confusion and enhance shopping experience — all with a few clicks. Retailed Size Chart & Guide is your key to reducing returns and boosting conversions. Designed for Shopify merchants, our app empowers you to create tailored size charts with no coding required. Whether you're selling sneakers, apparel, accessories, or bespoke items, our solution simplifies size guidance, ensuring your customers find their perfect fit. Reduce sizing confusion and enhance shopping experience — all with a few clicks. more Data stored in your shop: Using metaobjects and metafields as dynamic sources Drag & drop customization: Easily adjust your size charts without coding. Full theme editor compatibility: Seamlessly edit within Shopify's theme editor. Rich content support: Incorporate tables, images, videos, and tabs. Size chart | Size converter | Size guide | Size | Help size | Size tab | Sizer

5.0(Reviews)

Create trackable countdown timers for product pages, cart pages, and announcement bars. Countdown Timer Bar lets merchants add real-time countdown timers to their store. Timers can be used to display promotion deadlines, event dates, or order cut-off times. Timers can be shown on product pages, cart pages, landing pages, or as an announcement bar. The app supports fixed-date and event-based timers, geolocation targeting, and basic performance tracking through impressions and clicks. Countdown Timer Bar lets merchants add real-time countdown timers to their store. Timers can be used to display promotion deadlines, event dates, or order cut-off times. Timers can be shown on product pages, cart pages, landing pages, or as an announcement bar. The app supports fixed-date and event-based timers, geolocation targeting, and basic performance tracking through impressions and clicks. more Countdown timers for product, cart, landing pages, and announcement bars Fixed-date and event-based countdown timer configurations Geolocation targeting for region-specific timer display Mobile-responsive countdown timers across all supported pages Timer impressions and click tracking per countdown

5.0(Reviews)

AI analyzes Amazon product reviews to help merchants showcase insights and drive conversions. Reviewal helps Shopify store owners enhance the shopping experience by enabling customers to compare Amazon products based on real customer feedback. Using AI, it analyzes reviews and provides clear, data-driven summaries, making decision-making easier. This helps merchants improve engagement, build trust, and drive conversions by offering shoppers valuable insights at a glance. Simple to use and highly effective, Reviewal turns customer feedback into a powerful sales tool. Reviewal helps Shopify store owners enhance the shopping experience by enabling customers to compare Amazon products based on real customer feedback. Using AI, it analyzes reviews and provides clear, data-driven summaries, making decision-making easier. This helps merchants improve engagement, build trust, and drive conversions by offering shoppers valuable insights at a glance. Simple to use and highly effective, Reviewal turns customer feedback into a powerful sales tool. more Product Comparison Tool AI-Powered Review Summaries Easy Integration

0.0(Reviews)

Recently Viewed Products lets customers remember items they want to buy, and thus increase sales. The recently viewed products image slider will automatically display images of items that customers have previously looked at. In addition to adjusting the border, style, and color, you can also choose whether or not to autoplay and loop the pictures in your slider. Simply install the app in your Shopify store dashboard page, configure your settings (including how many products show up), and then paste a shortcode into any Theme pages you want active. The recently viewed products image slider will automatically display images of items that customers have previously looked at. In addition to adjusting the border, style, and color, you can also choose whether or not to autoplay and loop the pictures in your slider. Simply install the app in your Shopify store dashboard page, configure your settings (including how many products show up), and then paste a shortcode into any Theme pages you want active. more The image slider makes it easy for customers to find recently viewed products. It will help customers to find his/her recently viewed products. Change the number of products to display in the image slider. Choose whether to show the slider on other page / popup for product description. You can choose whether to have the image slider autoplay or loop continuously.

0.0(Reviews)

Order editing trusted by world‑class brands. Happier shoppers, more sales, fewer tickets. Revize delivers enterprise grade order editing trusted by world‑class brands. Shoppers edit orders before shipping: edit address, change quantity & variants, swap/ add products, apply discounts, generate tax invoices, or cancel orders. Auto-refunds as store credits keep revenue. AI upsells on order status page, email upsells & auto cancel orders. 100+ integrations: Klaviyo, Recharge & Shopify Flow. Third-party checkout support. 20+ languages. Enterprise order editor for Shopify. Revize delivers enterprise grade order editing trusted by world‑class brands. Shoppers edit orders before shipping: edit address, change quantity & variants, swap/ add products, apply discounts, generate tax invoices, or cancel orders. Auto-refunds as store credits keep revenue. AI upsells on order status page, email upsells & auto cancel orders. 100+ integrations: Klaviyo, Recharge & Shopify Flow. Third-party checkout support. 20+ languages. Enterprise order editor for Shopify. more Edit shipping address, change variants & quantity, swap/ add products, discounts Cancel orders w/ instant refunds or auto-refunds as store credits AI post-purchase upsells on order status page. Email upsells. Boost AOV Subscription editing, B2B orders, tax invoices, smart edit windows & tag rules 100+ integrations, 20+ languages, third-party checkout & Built for Shopify

5.0(Reviews)

Boost your Average Order Value with Upsells, Upgrades & Discounts. Sell more, and better! Don’t miss the opportunity to sell more items on every order with upsell and cross-sell offers. Set up manual or AI offers which contain upsell and/or upgrade products, you can also add automatic and combinable discounts, which increases the conversion rates. Revy Unlimited UpSell goal is to increase your average order revenue without bothering your customers, providing a light experience but that can bring great results. UpSell and Cross-sell now! Don’t miss the opportunity to sell more items on every order with upsell and cross-sell offers. Set up manual or AI offers which contain upsell and/or upgrade products, you can also add automatic and combinable discounts, which increases the conversion rates. Revy Unlimited UpSell goal is to increase your average order revenue without bothering your customers, providing a light experience but that can bring great results. UpSell and Cross-sell now! more Call-to-Action Trigger - Upsell or Cross-Sell at the add-to-cart action AI AutoPilot — AI-driven recommendations for highly relevant offers Mobile-first Design - Optimized for a smooth mobile & desktop experience Auto Discounts - Leverages the latest discount tech for a native-like experience Automatic & Clean Install - No theme disruption, ZERO coding needed

4.7(Reviews)

Drive Sales w/ Sales Pop Up, Social Proof, Sales Notification, Stock alert, FOMO, & Countdown timer Maximize conversions with Sales Rocket by creating urgency and FOMO in your Shopify experience using sales popups and email popup ups. Boost sales with social proof to your store with sales notifications, falling emojis and emoji reactions. Encourage faster buy decisions in your Shopify store with quick view stock counter and countdown FOMO timer. These urgency tools elevate user experience and motivate purchases, leading to higher revenue. Implement Sales Rocket for impactful sales growth. Maximize conversions with Sales Rocket by creating urgency and FOMO in your Shopify experience using sales popups and email popup ups. Boost sales with social proof to your store with sales notifications, falling emojis and emoji reactions. Encourage faster buy decisions in your Shopify store with quick view stock counter and countdown FOMO timer. These urgency tools elevate user experience and motivate purchases, leading to higher revenue. Implement Sales Rocket for impactful sales growth. more Sales Popup: Spark engagement with real-time notifications of recent purchases Popup: Offer limited time offers & coupons to users with an urgency pop up Stock Countdown: Encourage FOMO buying w/ visible, diminishing stock levels Countdown Timer: Infuse urgency with urgency timers for special deals & offers Animated Buttons: Elevate checkout with animated cart and checkout button

4.8(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.