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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.

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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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Boost your (B2B) store sales by adding a beautiful quote request experience for your customers. Enhance your online shopping experience with Quotify. Empower customers to request custom quotes for any product, perfectly fitting your business model. Streamline your quote process with a tailored flow, collect essential customer information, and send personalized proposals. Utilize Google Analytics for insightful quote funnel optimization and integrate Zapier for efficient automation. Upgrade your quote e-commerce strategy with Quotify! Capture every B2B lead with a seamless quote-to-order. Enhance your online shopping experience with Quotify. Empower customers to request custom quotes for any product, perfectly fitting your business model. Streamline your quote process with a tailored flow, collect essential customer information, and send personalized proposals. Utilize Google Analytics for insightful quote funnel optimization and integrate Zapier for efficient automation. Upgrade your quote e-commerce strategy with Quotify! Capture every B2B lead with a seamless quote-to-order. more Unlimited quote requests to never miss a chance to close the deal Build your own quote form to get the information you need from your customer Quotify can be translated in your preferred languages with just a few clicks Send proposals to customers and automatically convert to orders when accepted

4.7(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. Your 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 check box, a required checkbox/ mandatory checkbox at checkout. Terms box previously known as “EZ Terms and Conditions Checkbox”. Add a T&C checkbox to the cart in 1 click. Your 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 check box, a required checkbox/ mandatory checkbox at checkout. Terms box previously known as “EZ Terms and Conditions Checkbox”. more Adds a check box to cart for agreement, TOS, cart terms, 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 for terms of service, privacy policy, policies and contracts. Ensures security & privacy and compliance with age check and custom text box

4.8(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)

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 the only fully integrated, customizable and AI-powered 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

4.8(Reviews)

Recently Viewed captures and displays products customers have recently browsed. Recently Viewed helps Shopify merchants improve sales by showing customers items they've recently looked at, encouraging return visits and reducing abandoned sessions. Ideal for any store looking to improve customer retention and engagement, this app makes shopping smoother by allowing customers quick access to their browsing history without manual searching. Merchants benefit from improved conversions, improved customer satisfaction, and reduced bounce rates. Recently Viewed helps Shopify merchants improve sales by showing customers items they've recently looked at, encouraging return visits and reducing abandoned sessions. Ideal for any store looking to improve customer retention and engagement, this app makes shopping smoother by allowing customers quick access to their browsing history without manual searching. Merchants benefit from improved conversions, improved customer satisfaction, and reduced bounce rates. more Automatically captures and displays product views for each visitor. Customizable widget blends into your store’s existing design. Viewed items are saved to accounts when customers are logged in. Saves & displays history under customer accounts Cross-device access to history enables customers to continue shopping

0.0(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)

Recomify is a 1-click install, AI powered product recommendation, upsell & cross sell engine. Recomify is a 1-click install, cost-effective, unified solution for smart product recommendations, upsells and cross sells. Show your customers products they are more likely to buy and increase both the average order value and conversion rate. Recomify is a 1-click install, cost-effective, unified solution for smart product recommendations, upsells and cross sells. Show your customers products they are more likely to buy and increase both the average order value and conversion rate. more Ultimate Tool for Increasing Average Order Value Shopping Cart Page Upsells and Cross Sells Smart Related Products Manual Product Recommendations Shopify POS Compatible Sales

4.9(Reviews)

Create product quizzes to engage customers, boost sales, and grow the subscriber list. Quiz Builder lets you create a personalized product recommendation quiz to help each customer find their ideal product. Think of Recomma as your online sales assistant for your e-commerce store. Whether it's a skin quiz(skincare quiz), style quiz, personality 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 continuous insights about your target market. Quiz Builder lets you create a personalized product recommendation quiz to help each customer find their ideal product. Think of Recomma as your online sales assistant for your e-commerce store. Whether it's a skin quiz(skincare quiz), style quiz, personality 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 continuous 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. 4 publish type: Inline Quiz, Popup Quiz, Quiz on Button Click, Separate Page.

5.0(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 orders and events with Facebook, TikTok, Google, Pinterest, and Snapchat. Import orders into Google Sheets. Run A/B Tests on One-Click Upsells to compare variants, split traffic, and optimize conversions. 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 orders and events with Facebook, TikTok, Google, Pinterest, and Snapchat. Import orders into Google Sheets. Run A/B Tests on One-Click Upsells to compare variants, split traffic, and optimize conversions. more Fully customizable COD order form & layout (Popup/Embedded) with custom fields 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)

A fully-managed service to connect stores directly to Google Cloud Vertex AI Search for Commerce Product search and discovery is one of the most important website experiences, but it can be very difficult. Google Cloud’s Vertex AI 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 Cloud’s Vertex AI 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 Google Cloud Vertex AI Retail Search & Recommendations AI 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)

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)

Product Recommendation Quiz builder by RevenueHunt. Turn shoppers into leads & buyers with quizzes. Build beautiful, high-converting product recommendation quizzes — no coding needed. RevenueHunt helps you guide every shopper to their perfect product, collect valuable data, and drive measurable results across your store and marketing channels. Create quizzes with our AI-powered quiz builder, gain valuable insights, and sync with your mailing list or CRM to create high-ROI marketing campaigns. Start creating personalized shopping experiences that boost engagement, conversions, and loyalty. Build beautiful, high-converting product recommendation quizzes — no coding needed. RevenueHunt helps you guide every shopper to their perfect product, collect valuable data, and drive measurable results across your store and marketing channels. Create quizzes with our AI-powered quiz builder, gain valuable insights, and sync with your mailing list or CRM to create high-ROI marketing campaigns. Start creating personalized shopping experiences that boost engagement, conversions, and loyalty. more Boost sales – Guide customers to the right products with quizzes that convert. Collect actionable data. Segment and tag your shoppers based on their responses. Send captured leads to your mailing list or CRM to run personalized campaigns. Match your brand – Customize images, fonts, layout, and CSS to fit your style. Work with one of our account managers to build and launch your quiz.

4.9(Reviews)

Drive sales with urgency! Ultimate Countdown Timer Bar boosts conversions on any page of your store. Motivate customers to act quickly with a sense of urgency! Whether it’s a flash sale, holiday promotion, or special event, countdowns capture attention and drive conversions on your store. The Ultimate Countdown Timer Bar is crafted to increase sales and engagement - an essential tool for merchants looking to maximize every visit. Perfect for Product, Cart and Landing pages or Announcement bar. Our Countdown Timer Bar adapts to any campaign, creating the urgency that turns browsers into buyers. Motivate customers to act quickly with a sense of urgency! Whether it’s a flash sale, holiday promotion, or special event, countdowns capture attention and drive conversions on your store. The Ultimate Countdown Timer Bar is crafted to increase sales and engagement - an essential tool for merchants looking to maximize every visit. Perfect for Product, Cart and Landing pages or Announcement bar. Our Countdown Timer Bar adapts to any campaign, creating the urgency that turns browsers into buyers. more Versatile timers for all pages – product, cart, announcement, and landing pages. Flexible countdown options – set fixed or date-based countdowns for any event. Geolocation targeting – show region-specific offers to enhance conversions. Fully mobile-friendly – responsive templates for a seamless mobile experience. Customizable designs – choose colors, styles, and templates to fit your brand.

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)

Happier shoppers, more sales & fewer tickets with world class order editor trusted by top brands Revize delivers enterprise grade order editing trusted by world‑class brands. Shoppers edit shipping address, quantity & variants, swap/ add products, edit subscription orders, apply discounts, generate tax invoices, or cancel orders—all before shipping. Refunds as store credit retain revenue. Cut support tickets & returns. Drive growth with order page & email upsells, smart edit windows, & auto‑cancel order features. Only app with subscription order editing. Boost AOV & build lasting loyalty. Revize delivers enterprise grade order editing trusted by world‑class brands. Shoppers edit shipping address, quantity & variants, swap/ add products, edit subscription orders, apply discounts, generate tax invoices, or cancel orders—all before shipping. Refunds as store credit retain revenue. Cut support tickets & returns. Drive growth with order page & email upsells, smart edit windows, & auto‑cancel order features. Only app with subscription order editing. Boost AOV & build lasting loyalty. more Edit address, variants, quantity, shipping, swap/add products, discounts & more Order status & email upsells: customers edit orders & add products pre-shipping Self-serve order cancel, refund as store credit. Cut support tickets. BFCM ready Integrated with thank you page & order status page for seamless order editing Built with Shopify Plus in mind, 100+ integrations & Shopify Markets support

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

4.6(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.