AI-powered personalisation, upsells, and dynamic merchandising to boost conversions. Mercury is a no-code, drag-and-drop solution for delivering personalised product recommendations, upsells, and cross-sells. It enhances every step of the shopping journey, from product discovery to the cart. With AI-driven search and dynamic merchandising, Mercury ensures your store showcases the most relevant products at the right time, boosting conversions and AOV. Integrate seamlessly with your existing stack and track real-time analytics for optimisation. Mercury is a no-code, drag-and-drop solution for delivering personalised product recommendations, upsells, and cross-sells. It enhances every step of the shopping journey, from product discovery to the cart. With AI-driven search and dynamic merchandising, Mercury ensures your store showcases the most relevant products at the right time, boosting conversions and AOV. Integrate seamlessly with your existing stack and track real-time analytics for optimisation. more AI Personalisation: Tailor product recommendations based on shopper behaviour Upsell & Cross-Sell Zones: Increase AOV with upsells from product pages to cart Dynamic Merchandising: Automatically display relevant products based on data Inline Banners: Scheduled banners (image/video) on grids & category pages AI-Powered Search: Real-time autocomplete & filters for faster product discovery
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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Compare product specifications with ease using an interactive UI for easy shopping decisions. Easily enable product comparison on your store with CompareMate. Add a "Compare" button to product pages and grids, letting customers select items for comparison. Products are shown in an interactive drawer and can be compared side-by-side on a dedicated comparison page. Customers can add products to the cart directly from the comparison page, or remove items with a single click. A bulk editor makes it easy for merchants to manage comparison data across products. Easily enable product comparison on your store with CompareMate. Add a "Compare" button to product pages and grids, letting customers select items for comparison. Products are shown in an interactive drawer and can be compared side-by-side on a dedicated comparison page. Customers can add products to the cart directly from the comparison page, or remove items with a single click. A bulk editor makes it easy for merchants to manage comparison data across products. more Add "Compare" buttons to product pages and grids. Interactive drawer shows selected items for comparison. Side-by-side product comparison on a dedicated page. Add items to the cart directly from the compare page. Bulk editor for efficient comparison data management.
Customize a sticky mobile menu bar to enhance your shop's navigation experience. MeroxIO Sticky Mobile Menu Bar is designed to improve your shop's mobile navigation. This app allows Shopify store owners to add a customizable sticky menu bar at the bottom of mobile screens. You can select icons and link each to different sections of your store, streamlining the user experience and potentially increasing engagement. The app's intuitive design makes it easy to integrate and customize within your store's theme, offering a seamless shopping experience for your customers. MeroxIO Sticky Mobile Menu Bar is designed to improve your shop's mobile navigation. This app allows Shopify store owners to add a customizable sticky menu bar at the bottom of mobile screens. You can select icons and link each to different sections of your store, streamlining the user experience and potentially increasing engagement. The app's intuitive design makes it easy to integrate and customize within your store's theme, offering a seamless shopping experience for your customers. more Customizable Icons: Tailor menu icons to fit your store's style. Easy Link Integration: Direct customers with clickable icons. Sticky Navigation: Constant menu access for easy usability. Mobile Optimized: Designed for an excellent mobile experience Seamless Integration: Effortlessly blends with your store theme
Help shoppers find products they love with beautiful dropdown menus for mobile and desktop. Put your best foot forward with beautiful and professional menu templates. Meteor uses your existing Shopify navigation settings for lightning-fast setup time. Customize the design to your liking, and preview each of your menus before you publish. Show off product images in mobile and desktop menus, and help shoppers discover great products without leaving your home page. Link any resource from Shopify: products, collections, blogs, or pages. Multi-region support for menu items and currency! Put your best foot forward with beautiful and professional menu templates. Meteor uses your existing Shopify navigation settings for lightning-fast setup time. Customize the design to your liking, and preview each of your menus before you publish. Show off product images in mobile and desktop menus, and help shoppers discover great products without leaving your home page. Link any resource from Shopify: products, collections, blogs, or pages. Multi-region support for menu items and currency! more Menus in minutes! Use your store's existing menus to streamline setup Variety of beautiful templates for both desktop and mobile Display product or collection images directly in your store's main menu Multi-region support: translated menu items and local currency Customer-friendly UX helps customers easily navigate different menu tiers
Let customers upload, crop and personalize photos on product pages. Files attach to each order. Mighty Image Uploader adds a photo upload button to your product pages so customers can send the images you need for personalized orders. Customers crop, rotate and zoom each photo to the shape you set, add text to it and choose custom product options such as checkboxes, dropdowns and text fields. You can charge extra for paid options, require a minimum image resolution and open every uploaded file from its order in your admin. Mighty Image Uploader adds a photo upload button to your product pages so customers can send the images you need for personalized orders. Customers crop, rotate and zoom each photo to the shape you set, add text to it and choose custom product options such as checkboxes, dropdowns and text fields. You can charge extra for paid options, require a minimum image resolution and open every uploaded file from its order in your admin. more Unlimited image uploads & unlimited file size Product Options (free or paid): checkboxes, dropdowns, text fields, etc. Custom masks, shapes, grids, cropping, rotation, text fields, and much more. Easily access uploaded image file links attached to orders from the Admin Panel.
高い視認性のポップアップでセット購入率アップ！サブスク商品へのアップセルも可能 【1. 絶妙なタイミングでのアップセルバナー表示】 商品ページでカートに追加する瞬間にアップセルバナーを表示します。お客様の購買意欲が高まるこのタイミングを活用します。 【2.目立つポップアップデザイン】 注目を集めるポップアップデザインを採用。視認性が高いため、アップセルの成功率向上が期待できます。CSSでのデザイン変更も可。 【3.かんたん設定】 専門知識は不要です。直感的な操作で、数回のクリックでECサイトにアップセル機能を導入できます。 【4.定期購入オファーにも対応】 単発商品だけでなく、定期購入オファーへのアップセルも可能。お客様の継続的な利用を促し、安定した収益につなげます。 【1. 絶妙なタイミングでのアップセルバナー表示】 商品ページでカートに追加する瞬間にアップセルバナーを表示します。お客様の購買意欲が高まるこのタイミングを活用します。 【2.目立つポップアップデザイン】 注目を集めるポップアップデザインを採用。視認性が高いため、アップセルの成功率向上が期待できます。CSSでのデザイン変更も可。 【3.かんたん設定】 専門知識は不要です。直感的な操作で、数回のクリックでECサイトにアップセル機能を導入できます。 【4.定期購入オファーにも対応】 単発商品だけでなく、定期購入オファーへのアップセルも可能。お客様の継続的な利用を促し、安定した収益につなげます。 more 絶妙なタイミングで表示されるポップアップの為、アップセル率向上が期待できます。 日本製アプリで唯一のサブスクリプション商品へのアップセル/クロスセスが可能。 ノーコードで簡単設定 あんしんの日本語対応！導入前の検討段階から、導入後も使い方やカスタマイズのご相談など、メールやで丁寧にサポート。
Let shoppers virtually try on outfits instantly using their own photos. Your shoppers can shop with confidence using an ultimate AI-powered fitting room functionality. Our app lets them upload their photos and instantly try-on outfits and jewelry from your product catalog. With a seamless button on the product pages, you maintain the full control of its visibility to specific shoppers and daily credit limits across all devices. Helping shoppers to skip the guesswork and see exactly how the product looks before they checkout, which means fewer returns for you. Your shoppers can shop with confidence using an ultimate AI-powered fitting room functionality. Our app lets them upload their photos and instantly try-on outfits and jewelry from your product catalog. With a seamless button on the product pages, you maintain the full control of its visibility to specific shoppers and daily credit limits across all devices. Helping shoppers to skip the guesswork and see exactly how the product looks before they checkout, which means fewer returns for you. more Instantly show shoppers how they look with your product Display a button on product pages for customers to generate AI-powered try-ons Perfectly works across devices; optimized for conversions Enable the feature for specific products and VIP customers Limit the credits usage by setting a daily limit per customer
10+ bundle types: Mix and Match bundle builder, Build your own bundle (BYOB), Build a box, Add-ons. Grow AOV with bundles shoppers actually buy. Create “Build a Box” and “Mix & Match” bundles, set volume discounts by quantity or spend, and add free gifts when shoppers hit a threshold. Motivate completion with badges, a progress bar and "unlock next" messages. Track sales with conversion funnel analytics. Also supports 10+ bundle types (fixed bundles, quantity breaks, BOGO/Buy X Get Y, FBT, product add-ons, upsell pop-up, product recommendations & more). No-code setup → fast to launch. Grow AOV with bundles shoppers actually buy. Create “Build a Box” and “Mix & Match” bundles, set volume discounts by quantity or spend, and add free gifts when shoppers hit a threshold. Motivate completion with badges, a progress bar and "unlock next" messages. Track sales with conversion funnel analytics. Also supports 10+ bundle types (fixed bundles, quantity breaks, BOGO/Buy X Get Y, FBT, product add-ons, upsell pop-up, product recommendations & more). No-code setup → fast to launch. more Build a Box & Build your own bundle (BYOB) that shoppers love to buy Volume discounts by quantity or spend amount to grow AOV Free gifts by box size or by spend and quantity goals to encourage bigger carts Badges, progress bar, "unlock next" and low-stock messages to boos AOV 10+ bundle types: fixed bundles, BOGO/Buy X Get Y, quantity breaks, add‑ons
Add free shipping bar to the store. Set country specific free shipping messages for global customer Geo Shipping Bar adds a free shipping bar to your website. You can set country or continent specific messages to target international customers. You can customize the look and feel of the free shipping bar to match your theme. Welcome customers from different countries warmly to your international business by showing localized free shipping messages. You can configure different messages for the shipping progress bar state. Preview the free shipping bar message before making it live. Geo Shipping Bar adds a free shipping bar to your website. You can set country or continent specific messages to target international customers. You can customize the look and feel of the free shipping bar to match your theme. Welcome customers from different countries warmly to your international business by showing localized free shipping messages. You can configure different messages for the shipping progress bar state. Preview the free shipping bar message before making it live. more Customize the shipping bar using background color, font and timer Set different messages for customers coming from different countries/ continents Works with the multi country shipping limits set in your admin settings
Easily create Lookbooks with product rollovers and links directly to your products to purchase The Lookbook App • Easy setup with multiple themes to display • Link to purchase products • Customise your markers that display and connect your products (on mouse over or touch). • Customise display info for each product (Title, Price, Image). • Link markers to any product or URL. • Simple drag and drop interface to order the pages in each Lookbook. • Select any image assigned to a product as the rollover image for your marker. The Lookbook App • Easy setup with multiple themes to display • Link to purchase products • Customise your markers that display and connect your products (on mouse over or touch). • Customise display info for each product (Title, Price, Image). • Link markers to any product or URL. • Simple drag and drop interface to order the pages in each Lookbook. • Select any image assigned to a product as the rollover image for your marker. more Easily create Lookbooks with product rollovers to purchase Responsive for all devices with multiple themes. Create unlimited Lookbooks with no coding required.
(Black Friday 2026 Offer) Boost sales with free gifts with purchase, BOGO, upsells & quantity breaks Monk is built to do one thing exceptionally well: drive additional sales and conversions from your current store traffic. Run offers, discounts and product recommendations wherever they work best for you - product page, cart, checkout, or post-checkout. Customise the design & experience of the app's widgets (+ translate text) to suit your theme and brand and use the in-app eligibility rules engine to create highly targeted and personalised buyer experiences. Monk is built to do one thing exceptionally well: drive additional sales and conversions from your current store traffic. Run offers, discounts and product recommendations wherever they work best for you - product page, cart, checkout, or post-checkout. Customise the design & experience of the app's widgets (+ translate text) to suit your theme and brand and use the in-app eligibility rules engine to create highly targeted and personalised buyer experiences. more Improve cart’s conversion by combining cart upsells with a tiered progress bar Offer free gift with purchase of specific products, cart values ranges etc Combine free gifts with bundles to create 'buy more save more' style offer Create Buy X Get Y, BOGO offers for specific products, collections etc Offer upsells and cross sells across the entire buying journey
Turn customer support into a growth engine with an AI chatbot that works while you sleep. MooseDesk is an AI-powered helpdesk for Shopify stores that need faster replies, fewer tickets, and happier customers. The AI chatbot learns instantly from products, FAQs, and past Q&A to answer accurately 24/7 — no manual setup. Automate order tracking and repetitive questions, then seamlessly hand off to live chat when needed. Manage all conversations from one inbox and empower customers with multilingual FAQs. Less support effort. Faster responses. Built to scale with your business. MooseDesk is an AI-powered helpdesk for Shopify stores that need faster replies, fewer tickets, and happier customers. The AI chatbot learns instantly from products, FAQs, and past Q&A to answer accurately 24/7 — no manual setup. Automate order tracking and repetitive questions, then seamlessly hand off to live chat when needed. Manage all conversations from one inbox and empower customers with multilingual FAQs. Less support effort. Faster responses. Built to scale with your business. more AI Learning: Build a smarter chatbot using your FAQs, Q&A, and products 24/7 automation: Automate routine support and route complex cases to agents Omnichannel inbox: Manage chat, email, and social messages in one place Self-service support: Let customers track orders and find answers instantly Product FAQs: Manage product-specific FAQs displayed on each product page
Turn your Instagram feed, Reels, TikTok & UGC into a shoppable video gallery MP Instagram Feed shows your Instagram feed, Reels, TikTok videos and UGC as a shoppable video gallery. Auto-sync keeps your Instagram gallery fresh, and 11 Instagram feed layouts — grid, slider, masonry, collage & more — let you match your brand. Tag unlimited products so shoppers shop the look and add to cart in a tap. Show Instagram Stories, hashtag UGC and shoppable videos on home, product & collection pages, then track what sells with Instagram feed analytics. Live in minutes, no watermark. MP Instagram Feed shows your Instagram feed, Reels, TikTok videos and UGC as a shoppable video gallery. Auto-sync keeps your Instagram gallery fresh, and 11 Instagram feed layouts — grid, slider, masonry, collage & more — let you match your brand. Tag unlimited products so shoppers shop the look and add to cart in a tap. Show Instagram Stories, hashtag UGC and shoppable videos on home, product & collection pages, then track what sells with Instagram feed analytics. Live in minutes, no watermark. more Shoppable Instagram feed - tag unlimited products, shop the look in a tap Instagram Reels, Stories, TikTok & UGC in one gallery with video autoplay 11 Instagram gallery layouts - grid, slider, masonry, collage, stories bar Upload your own photos & videos, then pin, hide & reorder any post Product reviews, ratings & prices on your feed, plus Instagram feed analytics
Product recommendation quiz builder to personalize shopping and increase conversions. MP Product Quiz helps you create interactive product recommendation quizzes that personalize shopping and increase conversions. Guide customers to the right products using simple logic flows while reducing returns and boosting satisfaction. Build unlimited quizzes, customize designs to match your brand, embed them anywhere, and track performance with built-in analytics. Collect valuable customer data from quiz responses for segmentation, email marketing, and targeted campaigns. MP Product Quiz helps you create interactive product recommendation quizzes that personalize shopping and increase conversions. Guide customers to the right products using simple logic flows while reducing returns and boosting satisfaction. Build unlimited quizzes, customize designs to match your brand, embed them anywhere, and track performance with built-in analytics. Collect valuable customer data from quiz responses for segmentation, email marketing, and targeted campaigns. more Unlimited quizzes – Build product finders with no coding required Smart quiz logic – Recommend products based on customer answers Custom design – Match quizzes to your brand with flexible layouts Analytics & insights – Track quiz performance and shopper behavior Customer data – Segment users for email and remarketing campaigns
Reduce returns with customizable size charts, size guide & AI size recommender Sizing confusion costs holiday sales. When shoppers aren't sure about fit, they leave or return. MP Size Chart adds customizable size charts and size guides to Shopify product pages for fashion, footwear, jewelry & pets. Add size charts with images, videos & tabs. Import size charts in bulk via CSV. Use 30+ size chart templates, auto unit conversion and a dedicated size guide page. AI size recommendations guide shoppers to the right fit. Switching apps? We'll migrate your size charts for free. Sizing confusion costs holiday sales. When shoppers aren't sure about fit, they leave or return. MP Size Chart adds customizable size charts and size guides to Shopify product pages for fashion, footwear, jewelry & pets. Add size charts with images, videos & tabs. Import size charts in bulk via CSV. Use 30+ size chart templates, auto unit conversion and a dedicated size guide page. AI size recommendations guide shoppers to the right fit. Switching apps? We'll migrate your size charts for free. more 30+ size chart templates for apparel, footwear, jewelry & pets — quick setup Bulk import size charts via CSV — no manual entry Size guide display options — floating, inline, dropdown, or next to size 20+ languages, unit conversion & multiple size labels for global stores AI size recommender & fit finder — shoppers get their right size instantly
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
Help shoppers find your stores fast with maps, search & directions — drive more foot traffic. MS Google Maps & Store Locator helps Shopify merchants display retail locations, dealers and service points on an interactive map. Customers search nearby stores by zip, city or use geolocation to auto-detect location. Each listing shows store hours, directions and contact details. Manage locations from one dashboard or bulk import via CSV and Google Sheets. The responsive store finder works on mobile and desktop. Customize map styles, pins, filters, branding and CSS to match your store. MS Google Maps & Store Locator helps Shopify merchants display retail locations, dealers and service points on an interactive map. Customers search nearby stores by zip, city or use geolocation to auto-detect location. Each listing shows store hours, directions and contact details. Manage locations from one dashboard or bulk import via CSV and Google Sheets. The responsive store finder works on mobile and desktop. Customize map styles, pins, filters, branding and CSS to match your store. more Store Locator Page – Let customers find nearby stores, dealers or retailers Google Maps & Geolocation – Auto-detect visitor location and show stores on map Bulk Import via CSV & Google Sheets – Add hundreds of locations instantly Mobile-Optimized Store Finder – Responsive locator with directions and filters Fully Customizable – Map styles, icons, custom fields, branding and CSS options
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
Display location-wise Inventory availability on product pages, enabling customers to choose location Display Stock availability by location on your stores product page and keep your users updated about current and incoming inventory. Customers can pick their preferred store while adding items to their cart. Highlight products by location-based collections and increase traffic to your stores. Simplify order routing & fulfillment for shopify multi-location operations. Help find stock at nearest store using geolocation. Designed for speed, fast storefronts with multi-language translation support. Display Stock availability by location on your stores product page and keep your users updated about current and incoming inventory. Customers can pick their preferred store while adding items to their cart. Highlight products by location-based collections and increase traffic to your stores. Simplify order routing & fulfillment for shopify multi-location operations. Help find stock at nearest store using geolocation. Designed for speed, fast storefronts with multi-language translation support. more Display Stock availability with location details on product page Shop from selected location or use geolocation to get nearby location with stock Sync Locations to Product tags & metafields for filtering or creating collection Target customers by showing store location in their country or within set radius Showcase location-specific products with collections to drive in-store visits
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
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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.