Reduce returns & boost conversions with customizable size charts & AI size recommendations Sizing confusion costs apparel sales. When shoppers aren't sure about fit, they leave or return. MP Size Chart uses AI-powered recommendations to guide shoppers to the right fit. Show customizable size charts on product pages for fashion, footwear, accessories & more. Add unlimited charts with images, videos & tabs. Import in bulk via CSV. Use 30+ templates, auto unit conversion and a dedicated size guide page. Switching apps? We'll migrate your existing size charts for free with setup support. Sizing confusion costs apparel sales. When shoppers aren't sure about fit, they leave or return. MP Size Chart uses AI-powered recommendations to guide shoppers to the right fit. Show customizable size charts on product pages for fashion, footwear, accessories & more. Add unlimited charts with images, videos & tabs. Import in bulk via CSV. Use 30+ templates, auto unit conversion and a dedicated size guide page. Switching apps? We'll migrate your existing size charts for free with setup support. more AI-powered size recommendations help shoppers find their right fit Quick setup — 30+ size chart templates with images, videos, tabs & tables Import unlimited size charts via CSV — bulk upload made easy Support 20+ languages & auto unit conversion for global stores One size guide page shows all charts — auto-synced, always fresh
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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Add unlimited product options, variants & price add-ons with advanced conditional logic. No coding. Shopify limits products to 100 variants MPO - Multiple Product Options removes that barrier. Add unlimited custom product options to any product: text fields, color & image swatches, file uploads, date pickers, dropdowns, and 20+ more field types. Collect personalized order details like names, logos, engravings, or monograms. Set price add-ons per option and use AND/OR conditional logic to show only the right fields. All data appears directly in your order admin. No coding needed. Shopify limits products to 100 variants MPO - Multiple Product Options removes that barrier. Add unlimited custom product options to any product: text fields, color & image swatches, file uploads, date pickers, dropdowns, and 20+ more field types. Collect personalized order details like names, logos, engravings, or monograms. Set price add-ons per option and use AND/OR conditional logic to show only the right fields. All data appears directly in your order admin. No coding needed. more 20+ field types: text, swatch, file upload, date, color picker & more Advanced AND/OR conditional logic to show or hide fields dynamically Price add-ons per option - charge extra for custom variants or upgrades Assign option sets by product, tag, vendor, type, URL, or handle All custom field data visible on orders, packing slips & email notifications
5-in-1 Sticky Add to Cart App to Improve Sales, Conversion, AOV, & Reduce cart abandonment. MS Sticky Add to Cart is designed to help increase traffic conversion rates, AOV, and sales by making the add-to-cart and Buy now buttons super easy for customers to find and use. Sticky add to cart allows shoppers around the site to quickly add products to their cart and go through checkout without friction. The Cart Booster bar is easy to find and helps reduce cart abandonment. The button animations are attention-grabbing and help customers skip cart straight to checkout MS Sticky Add to Cart is designed to help increase traffic conversion rates, AOV, and sales by making the add-to-cart and Buy now buttons super easy for customers to find and use. Sticky add to cart allows shoppers around the site to quickly add products to their cart and go through checkout without friction. The Cart Booster bar is easy to find and helps reduce cart abandonment. The button animations are attention-grabbing and help customers skip cart straight to checkout more Sticky Add to Cart and Buy Now button on Product page and collection page A Floating Cart Booster - customer can easily access cart from any pages Sticky Checkout Bar on cart for Quick & faster checkout Mini Cart Icon on Collection Page for Instant checkout One Click Checkout like Amazon for Faster order placing
Create step-by-step product flows. Help customers choose add-ons and customize products. Use MultiStep to create guided shopping flows, letting customers make one choice at a time — for example: color, size, material — while suggesting optional add-ons along the way. Break a single product’s options into steps, or guide customers through multiple products in featured assortments. Collect custom inputs and set logic rules to control what appears at each stage. Show in your store as a pop-up, embedded section, or product page add-on. Use MultiStep to create guided shopping flows, letting customers make one choice at a time — for example: color, size, material — while suggesting optional add-ons along the way. Break a single product’s options into steps, or guide customers through multiple products in featured assortments. Collect custom inputs and set logic rules to control what appears at each stage. Show in your store as a pop-up, embedded section, or product page add-on. more Simplify product options into guided choices Step through multiple products in kits and assortments Suggest relevant add-ons at the right moment Collect custom inputs like text, uploads, and toggles Control products that show with flexible logic rules
Set Cart Goals with a Free Shipping Progress Bar, Cart Upsell Products, Get Higher AOV and Sales. Increase your average order value with the MVR Free Shipping Bar! Set a goal and show the progress bar to your customers! Offer Free Shipping, Discount, or a Gift once they reach the goal. Customers love the feeling of completion and the MVR free shipping bar does just that! It boosts your sales just by adding it to your product or cart page. Choose any of the high-converting designs or create your own! It’s so easy to set up! Don’t wait, install now! Increase your average order value with the MVR Free Shipping Bar! Set a goal and show the progress bar to your customers! Offer Free Shipping, Discount, or a Gift once they reach the goal. Customers love the feeling of completion and the MVR free shipping bar does just that! It boosts your sales just by adding it to your product or cart page. Choose any of the high-converting designs or create your own! It’s so easy to set up! Don’t wait, install now! more Set progress bar on product or cart page Multi-currency and goal customization Upsell products and unlimited views Full progress bar design customisation to fit your brand Developer support
Improve website navigation & UX with AI-generated menus, tab bars, mega menus, and more Default website menus are often simple and outdated, making it harder for visitors to find products or key pages. Poor navigation slows browsing and hurts the shopping experience. Navi+ helps you upgrade website navigation with modern styles like mega menus, tab bars, slide (hamburger) menus, grid menus, and floating action buttons for quick access or support. Use ready-made templates and drag-and-drop editing to build navigation that improves usability and SEO. Key features of Navi+: Default website menus are often simple and outdated, making it harder for visitors to find products or key pages. Poor navigation slows browsing and hurts the shopping experience. Navi+ helps you upgrade website navigation with modern styles like mega menus, tab bars, slide (hamburger) menus, grid menus, and floating action buttons for quick access or support. Use ready-made templates and drag-and-drop editing to build navigation that improves usability and SEO. Key features of Navi+: more Replace basic theme menus with modern navigation styles Add mega menus, tab bars, slide (hamburger) menus, grid menus, and more Create a clean, app-like navigation and browsing experience Use ready-made templates without coding Fast, SEO-friendly, and compatible with most Shopify themes
Add different nav menus to different pages or based on customer tag. Hide menu on designated pages. Hide or add different navigation menus based on customer tag, login status, or page. Show a unique header menu to VIP customers, wholesale buyers, or first-time visitors — or hide the menu completely on landing pages for a distraction-free layout. No custom coding needed. Set your rules once and Navvy handles the rest. Hide or add different navigation menus based on customer tag, login status, or page. Show a unique header menu to VIP customers, wholesale buyers, or first-time visitors — or hide the menu completely on landing pages for a distraction-free layout. No custom coding needed. Set your rules once and Navvy handles the rest. more Add different header menus to different pages Show different header menus to different customers based on customer tag Simplify navigation & increase loyalty. Remove header with menu and icons from any page
Create forms with our form builder, enhancing your website's functionality and user experience! E-commerce merchants understand that information is power, and our form builder gives you exactly that. It offers an easy way to create engaging, customizable forms for your customers. This could be anything from detailed customer surveys to simple contact forms. The data you collect helps you make informed business decisions and tailors your offerings to suit your customer's needs. Optimize your business operations, improve user interaction, and make data-driven decisions with Nerdy Form! E-commerce merchants understand that information is power, and our form builder gives you exactly that. It offers an easy way to create engaging, customizable forms for your customers. This could be anything from detailed customer surveys to simple contact forms. The data you collect helps you make informed business decisions and tailors your offerings to suit your customer's needs. Optimize your business operations, improve user interaction, and make data-driven decisions with Nerdy Form! more Customize email notifications and auto responder email when a form is submitted. Easy to create multistep forms. Forms in pop-up and forms with conditional logic Upload files and attach them to notification email. A great variety of fields: datepicker, range slider, image select and more Numerous styling customizations to exactly match your shop's aesthetic.
Build branded email sign-up forms and grow your audience effortlessly with GetResponse Forms GetResponse Forms is an ideal solution for merchants aiming to grow their email list and enhance customer engagement with targeted email campaigns. This app effortlessly integrates with GetResponse, streamlining lead collection so you can easily manage subscribers and run impactful marketing campaigns. With fully customizable, mobile-friendly forms and advanced targeting features, it enables you to connect with the right customers at the right moment, boosting conversions and increasing sales. GetResponse Forms is an ideal solution for merchants aiming to grow their email list and enhance customer engagement with targeted email campaigns. This app effortlessly integrates with GetResponse, streamlining lead collection so you can easily manage subscribers and run impactful marketing campaigns. With fully customizable, mobile-friendly forms and advanced targeting features, it enables you to connect with the right customers at the right moment, boosting conversions and increasing sales. more Create personalized forms and pop-ups that match your store’s design. Start growing your email list in minutes with an intuitive setup process. Automatically connect and sync email subscribers with your GetResponse account. Ensure your forms are optimized for all devices.
A fully customizable and translatable cookie bar that ensures GDPR/CCPA compliance Ninja Cookie Bar GDPR offers a one-click solution for GDPR/CCPA (and more) cookie compliance. With Ninja Cookie Bar, you can display a professional cookie consent banner that appears for every new visitor and stays visible until they provide informed consent. Customize the banner to match your branding strategy and ensure compliance effortlessly. Ninja Cookie Bar GDPR offers a one-click solution for GDPR/CCPA (and more) cookie compliance. With Ninja Cookie Bar, you can display a professional cookie consent banner that appears for every new visitor and stays visible until they provide informed consent. Customize the banner to match your branding strategy and ensure compliance effortlessly. more One-click GDPR/CCPA cookie bar setup with user preferences and rejection options Include links from the banner to the full cookie policy and terms & conditions Fully customize the cookie bar's translations, colors, preferences, and blocks.
Effortlessly create stunning lookbooks & image galleries to captivate your audiences and drive sales Nitro Lookbooks allows merchants to create shoppable image galleries that drive more sales and enhance brand professionalism. You can pin many items to your lookbook including products, images, texts, and links which drive customers to explore more about your products. Also, lookbooks can be added at any position, on any page of your website. With various stunning layouts & design options, you can freely customize the lookbook as you want. Live chat support is always happy to assist. Nitro Lookbooks allows merchants to create shoppable image galleries that drive more sales and enhance brand professionalism. You can pin many items to your lookbook including products, images, texts, and links which drive customers to explore more about your products. Also, lookbooks can be added at any position, on any page of your website. With various stunning layouts & design options, you can freely customize the lookbook as you want. Live chat support is always happy to assist. more Create shoppable lookbooks allowing you to pin products, images & links easily Various stunning & modern layouts to showcase lookbook Freely customize how lookbooks & galleries display on your store Customize presets for lookbook elements: hotspot (pins), tooltips & buttons Showcase lookbooks & galleries at any position on any page
Intelligent Commerce Experience Platform helping brands increase online engagement and revenue We help online brands transform the commerce experience by enriching and connecting customer, product, and content data so they can deliver personalized experiences at scale. This is done through our AI-powered Commerce Experience Platform made up of intuitively designed tools that increase online revenue through end-to-end commerce experience management. Nosto makes every online commerce experience authentic and relevant so consumers have loveable experiences with their favorite brands. We help online brands transform the commerce experience by enriching and connecting customer, product, and content data so they can deliver personalized experiences at scale. This is done through our AI-powered Commerce Experience Platform made up of intuitively designed tools that increase online revenue through end-to-end commerce experience management. Nosto makes every online commerce experience authentic and relevant so consumers have loveable experiences with their favorite brands. more Site Search. Powerful, personalized, AI search to boost product discovery Personalization. Make the experience unique for every single shopper every time Merchandising. Total control over product rankings within all discovery pillars Content. Personalized content and authentic UGC to increase conversions Business Intelligence. Dive deep on the things that make your shoppers tick
Engage with customers everywhere: Facebook Messenger, Telegram, & 20+ chat channels & Contact Form. With one-click integration with Omega: Facebook Messenger Chat & Contact Form, you can keep conversions persistent across your Shopify stores through Facebook chat, chat popup, and 20+ platforms like SMS, Email, Viber, Phone, WeChat, Skype, Line, TikTok, Telegram, Facebook and Instagram, etc. Omega Facebook Messenger Chat help increase sales conversions, generate leads, and improve customer support with one live chat button With one-click integration with Omega: Facebook Messenger Chat & Contact Form, you can keep conversions persistent across your Shopify stores through Facebook chat, chat popup, and 20+ platforms like SMS, Email, Viber, Phone, WeChat, Skype, Line, TikTok, Telegram, Facebook and Instagram, etc. Omega Facebook Messenger Chat help increase sales conversions, generate leads, and improve customer support with one live chat button more Build your customer support with Messenger chat, Teleram, and Instagram,... All-in-one chat button lets customers chat with you via their preferred chat app Customize chat widget's style, device & page target, and preset welcome messages Analyze the effectiveness of chat channels: Messenger & contact form Messenger welcome message box helps increase customer engagement
Easy set up WhatsApp, Instagram, other social media, chat, and your favorite images in your shop! This app easily adds a WhatsApp button to your shop. In addition to WhatsApp, it comes with preset icons for social media platforms like Instagram, TikTok, X, Messenger, Telegram, and LINE. You can also upload your favorite images, allowing you to set buttons for phone, email, chat, concierge, and more. You can freely set the destination link for the buttons as well. How you use it is up to you! This app easily adds a WhatsApp button to your shop. In addition to WhatsApp, it comes with preset icons for social media platforms like Instagram, TikTok, X, Messenger, Telegram, and LINE. You can also upload your favorite images, allowing you to set buttons for phone, email, chat, concierge, and more. You can freely set the destination link for the buttons as well. How you use it is up to you! more You can easily install a WhatsApp button in your shop. You can also install SNS buttons other than WhatsApp. You can upload your favorite image and set a link. You can freely set the installation location. Select which markets to display when multiple markets are available.
Boost Sales with AI Quizzes & Funnels That Guide Shoppers, Personalize Products, & Drive Conversions Octane AI helps DTC brands turn shoppers into converted sales with AI-powered quizzes & smart funnels. Collect zero-party data, build rich customer profiles, & deliver personalized product recommendations automatically. Give your shoppers a guided experience by recommending the right product at the right moment, while reducing returns. Uncover opportunities & trends; optimize conversions with built-in A/B testing & performance tracking. Works seamlessly with Klaviyo, Postscript, Attentive, etc. Octane AI helps DTC brands turn shoppers into converted sales with AI-powered quizzes & smart funnels. Collect zero-party data, build rich customer profiles, & deliver personalized product recommendations automatically. Give your shoppers a guided experience by recommending the right product at the right moment, while reducing returns. Uncover opportunities & trends; optimize conversions with built-in A/B testing & performance tracking. Works seamlessly with Klaviyo, Postscript, Attentive, etc. more Quiz: Product recommendations using personalized quizzes automatically with AI Shopping Assistant: Show quizzes in a popup to move from discovery to purchase Smart Products: Tell AI what you want & get immediate product recommendations Smart Copy: Add text prompts to quiz results to recommend personalized products Image Analyzer: Customers upload photos for AI analysis for shade matching, etc.
Boost sales by showcasing the Best Sellers on your Homepage using an image Slider / Carousel Best sellers generate most of your revenue—make them impossible to miss. OctoSlide helps you automatically promote top products on your homepage or collections through customizable sliders and carousels. Choose compact or enlarged product sliders, enable lazy load for faster PageSpeed, and add zoom-on-hover. Fully supports Online Store 2.0, collection sliders, and homepage product carousels, helping you boost sales and showcase products beautifully with responsive image sliders. Best sellers generate most of your revenue—make them impossible to miss. OctoSlide helps you automatically promote top products on your homepage or collections through customizable sliders and carousels. Choose compact or enlarged product sliders, enable lazy load for faster PageSpeed, and add zoom-on-hover. Fully supports Online Store 2.0, collection sliders, and homepage product carousels, helping you boost sales and showcase products beautifully with responsive image sliders. more Add a one-click Add to Cart button on any product slider to boost conversions Increase engagement with customizable carousels, sliders, and image slideshows Match your brand look by styling product sliders and carousels to fit your theme Track sales performance from each slider / carousel with the built-in analytics Ensure a smooth experience with fully mobile-optimized product sliders
Discover the ease and flexibility of our customizable and user-friendly store branch locator. Simplify your store branch location with our user-friendly store branch locator app. Push in-store sales, reduce support queries, and effectively showcase your stores, retailers, and dealers. Gain valuable insights into customer preferences with advanced analytics. Optimize your strategy with data-driven decisions. Try our store locator today. Simplify your store branch location with our user-friendly store branch locator app. Push in-store sales, reduce support queries, and effectively showcase your stores, retailers, and dealers. Gain valuable insights into customer preferences with advanced analytics. Optimize your strategy with data-driven decisions. Try our store locator today. more No need for an API key – easy installation without external services or expenses Choose from various map styles and utilize custom markers to categorize Add unlimited number of locations and display store details with review section Add anywhere in your page - home, collection or any page using theme block You can enable widgets or App Embed with customizable option
Allow shoppers to create custom pricing quotes real-time and self-checkout! This app allows you to generate pricing on the fly! Create unlimited variants (avoid Shopify's variant limit), unlimited options, custom pricing calculations, quotes, bundles, subscriptions, selling plans, and more without having to create a custom app! It is designed to be developer friendly with no rigid templates. Use your own HTML, CSS, and JavaScript formula. Customize it however you wish! This app allows you to generate pricing on the fly! Create unlimited variants (avoid Shopify's variant limit), unlimited options, custom pricing calculations, quotes, bundles, subscriptions, selling plans, and more without having to create a custom app! It is designed to be developer friendly with no rigid templates. Use your own HTML, CSS, and JavaScript formula. Customize it however you wish! more Allows unlimited questions / prices / variants / options Increase sales with real-time quotes and shopper self-checkout Run your own code without having to build an app Developer friendly - built for devs
Provide search suggestions as you type. One can also enable search results and collection filters. This app boosts search & discovery with instant suggestions as you type, helping customers find products, blogs, pages & collections quickly. Product filters: Refine results on search results page & collection pages using smart filters. Data analysis: Gain valuable search data insights. Easy installation: Seamlessly integrate with your store. This app boosts search & discovery with instant suggestions as you type, helping customers find products, blogs, pages & collections quickly. Product filters: Refine results on search results page & collection pages using smart filters. Data analysis: Gain valuable search data insights. Easy installation: Seamlessly integrate with your store. more LiveSearch suggestions with unlimited products, collections, pages & blogs Smart search bar Search results page and collection page filter menu. Complete search and click pattern analysis. The app works for all languages.
Make your shop comply with the EU Omnibus Directive. Our app ensures full compliance with the European Omnibus Directive by displaying the lowest price of the past 30 days for each product variant around Unified Markets. We monitor and record price changes, keeping the lowest price always updated. The product page widget is fully customizable in terms of color, spacing, and formatting, offering advanced display settings, including the ability to hide it by vendor and tag. You can reach us via chat or email for assistance. Our app ensures full compliance with the European Omnibus Directive by displaying the lowest price of the past 30 days for each product variant around Unified Markets. We monitor and record price changes, keeping the lowest price always updated. The product page widget is fully customizable in terms of color, spacing, and formatting, offering advanced display settings, including the ability to hide it by vendor and tag. You can reach us via chat or email for assistance. more Complies with Omnibus: Track the lowest price over 30 days or custom timeframe. Customizable Widget: Edit colors, adjust spacing, position and translate texts. Display initial price, hide widget based on product price, vendors or tags. Support through live chat and email for any request. Market supports via Unified Markets.
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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.