Send a birthday email with a discount to build loyalty and repeat purchases Happy Birthday Email lets you celebrate every customer’s birthday with a personalised email and birthday discount. Collect birth dates online or in-store, then send automated birthday emails that drive sales and boost loyalty. Use it as a simple birthday loyalty program or connect it with your email platform. You’ll build stronger relationships and gain insight into customer age and anniversaries too. Happy Birthday Email lets you celebrate every customer’s birthday with a personalised email and birthday discount. Collect birth dates online or in-store, then send automated birthday emails that drive sales and boost loyalty. Use it as a simple birthday loyalty program or connect it with your email platform. You’ll build stronger relationships and gain insight into customer age and anniversaries too. more Send birthday emails with personalised messages and discounts Run a birthday loyalty campaign with zero ongoing effort Collect birthdays and age data at checkout, POS, or landing pages Works with your email platform or sends happy birthday emails for you Populates Shopify’s customer birthday metafield
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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All in one top bar. Free shipping progress, auto discount, email, countdown, multiple banners. NEW: show free shipping progress in a pop up thermometer! No need to install multiple apps for Free Shipping Bar, Automatic Discount, Coupon, Email, Announcements, or Countdown. Headband includes all these banners in one app, so you can manage all your banners in one place, and have them work seamlessly together. Use multiple banners, stacked or in a slider. Easily customize your banners to match your store's appearance. No changes are made to your theme. No coding is needed. NEW: show free shipping progress in a pop up thermometer! No need to install multiple apps for Free Shipping Bar, Automatic Discount, Coupon, Email, Announcements, or Countdown. Headband includes all these banners in one app, so you can manage all your banners in one place, and have them work seamlessly together. Use multiple banners, stacked or in a slider. Easily customize your banners to match your store's appearance. No changes are made to your theme. No coding is needed. more Free shipping progress bar or thermometer shoppers spend more & convert sooner. Countdown, discount banner, email popup, and linkable announcement for any need. No code necessary. Easily customized look and feel to match your store.
Create customer sign-up forms as unique as your business, and save custom data to customer accounts. Helium Customer Fields is your one-stop shop to collect and manage customer data. Create unique registration forms for different customer groups, and collect first-party data from customers such as birthday, pet's name, VAT/Tax ID, etc. All customer data is synced with Shopify fields and customer metafields. Personalize forms with rules and variables, or add customer tags automatically based on first-party data. Use our integrations to sync customer data with your business/marketing tools. Helium Customer Fields is your one-stop shop to collect and manage customer data. Create unique registration forms for different customer groups, and collect first-party data from customers such as birthday, pet's name, VAT/Tax ID, etc. All customer data is synced with Shopify fields and customer metafields. Personalize forms with rules and variables, or add customer tags automatically based on first-party data. Use our integrations to sync customer data with your business/marketing tools. more Simple drag-and-drop form builder with field types for nearly any use case Approve Wholesale/B2B customers with account approval or email verification Allow customers to edit their own data (name, email, or custom fields) Configure automatic and/or conditional customer tags to organize customer groups Developer-friendly! Front-end and back-end APIs are available for custom builds
Welcome your customers & Boost your sales Welcome your customers on your store and show them announcements, offers, deals and increase your sales. The Hello Announcements App is easy to use and doesn't require any form of coding skills. The app automatically gets installed on your store and if you ever decide to uninstall it, no residue code will be left. The app allows you to easily announce sales, deals and even discount codes. With it many options, you can fully customize the bars including colors, text and even integrate links. Welcome your customers on your store and show them announcements, offers, deals and increase your sales. The Hello Announcements App is easy to use and doesn't require any form of coding skills. The app automatically gets installed on your store and if you ever decide to uninstall it, no residue code will be left. The app allows you to easily announce sales, deals and even discount codes. With it many options, you can fully customize the bars including colors, text and even integrate links. more Welcome your customers and Give them offers = More sales! Customize the announcement bar colors, button label and target countries. Easy to use but has powerful options.
Pop Ups Elevated: beautifully designed popups for abandoned carts, email capture, upsells, etc... Turn visitors into customers. Easy to use pop ups created by famed internet marketer NEIL PATEL over a decade ago. Beautiful templates and an easy to use builder makes it a breeze to create beautiful and engaging popups without a designer. Get access to over 300 templates designed to help capture email addresses, recover abandoned carts, get customer feedback, upsell customers, make announcements and so much more. We're on a mission to help great stores grow through better pop ups. Turn visitors into customers. Easy to use pop ups created by famed internet marketer NEIL PATEL over a decade ago. Beautiful templates and an easy to use builder makes it a breeze to create beautiful and engaging popups without a designer. Get access to over 300 templates designed to help capture email addresses, recover abandoned carts, get customer feedback, upsell customers, make announcements and so much more. We're on a mission to help great stores grow through better pop ups. more Can be used to capture email addresses & recover abandoned carts. Helps to announce sales and drive traffic to specific product pages. Can be targeted based on pages, geo, site location and user behavior. Includes 100s of templates to make it easy to design stunning pop ups and bars. Direct integrations w/ e-mail providers including Klaviyo, Mailchimp, & more
Easily create FAQ page for your store or products to reduce your customer service time & usefulness. Easy FAQ revolutionizes your store's FAQs! Designed with users in mind, it effortlessly crafts stylish product Q&A and seamlessly integrates with your theme for maximum impact! Elevate your brand with full customization—tweak fonts, colors, and styles to match your unique flair. Plus, experience lightning-fast page loads, ensuring your customers get the answers they need in a blink. Reduce customer support requests with questions and answers! App also easily integrated with Shop app! Easy FAQ revolutionizes your store's FAQs! Designed with users in mind, it effortlessly crafts stylish product Q&A and seamlessly integrates with your theme for maximum impact! Elevate your brand with full customization—tweak fonts, colors, and styles to match your unique flair. Plus, experience lightning-fast page loads, ensuring your customers get the answers they need in a blink. Reduce customer support requests with questions and answers! App also easily integrated with Shop app! more Fully customizable FAQ themes to match with your store brand & style. Allows creation of store & product FAQs & product in simplistic & seamless way. Default support for Google rich SEO snippets for your dedicated FAQ page. You can add photos/videos to your question & answers Supports multiple languages that your store supports!
Add urgency and fear-of-missing-out effects to your sales, and increase conversion and sales Countdown Timer Bar can help you add a sense of urgency in your sales events, make your customers feel they must act now to avoid missing out on something important, and drive more sales. The App supports various types of timers, such as one-time, auto-recurring, daily & weekly timer. You can use them for different sales events. It also offers targeting options including geo location, customer, page, etc. You can have targeted events for different countries, customers, and optimize the sales. Countdown Timer Bar can help you add a sense of urgency in your sales events, make your customers feel they must act now to avoid missing out on something important, and drive more sales. The App supports various types of timers, such as one-time, auto-recurring, daily & weekly timer. You can use them for different sales events. It also offers targeting options including geo location, customer, page, etc. You can have targeted events for different countries, customers, and optimize the sales. more One-time, auto-recurring, daily & weekly timers can fit different types of sales Advanced targeting: location, Shopify markets, customer, page, product, device Scheduling, you can plan sales events in advance for events like Black Friday Fully customizable with various rotation & animation, background images & styles Supports all pages, 1-click to enable, no coding required
Promote free shipping with progressive messages to motivate customers to buy more & boost sales Free Shipping Bar displays progressive messages when customers put more items in their shopping carts, and lets them know how much more to buy in order to get your free shipping. This increases average order value and boosts sales. The bar is fully customizable with advanced targeting options including geo location, Shopify markets, customer, page, product, etc. You can have multiple free shipping offers for different countries, customers, and optimize the sales. Free Shipping Bar displays progressive messages when customers put more items in their shopping carts, and lets them know how much more to buy in order to get your free shipping. This increases average order value and boosts sales. The bar is fully customizable with advanced targeting options including geo location, Shopify markets, customer, page, product, etc. You can have multiple free shipping offers for different countries, customers, and optimize the sales. more Display messages with progressive shipping goals, and boost sales Advanced targeting: location, Shopify markets, customer, page, product, device Scheduling, you can plan free shipping in advance for events like Black Friday Fully customizable & supports all pages, 1-click to enable, no coding required Auto-detect visitors' local currencies and convert the free shipping amount
Promote sales on a fully customizable banner, increase customer awareness and boost sales Always keeping your customers in the loop about your business updates, promotions, and events is a key element of managing customer relationships. Quick Announcement Bar makes this easier and quicker. You can add a fully customizable banner on your website with a few clicks, inform your customers. You can have multiple bars shown in rotation or with various animations. You can offer different sales on different bars for different geo locations, customers, pages, etc, and optimize the return. Always keeping your customers in the loop about your business updates, promotions, and events is a key element of managing customer relationships. Quick Announcement Bar makes this easier and quicker. You can add a fully customizable banner on your website with a few clicks, inform your customers. You can have multiple bars shown in rotation or with various animations. You can offer different sales on different bars for different geo locations, customers, pages, etc, and optimize the return. more Present your sales events with a customized bar, increase awareness and sales Advanced targeting geo location, customer, page, product, device targeting Scheduling, you can plan sales in advance for events like Black Friday Fully customizable with various rotation & animation, background images & styles Supports all pages, 1-click to enable, no coding required
Quick access to product preview in one click without reloading the whole site. Quick View app gives your shoppers quick access to product preview in one click without reloading the whole site. The app will not only reduce shopping time but also bring a convenient experience to shoppers. Your shoppers can view product details quickly without leaving the catalog navigation. This makes browsing products easier and faster, which helps increase conversion rates. Products may be added to the cart from the Product Quick View pop-up. Quick View app gives your shoppers quick access to product preview in one click without reloading the whole site. The app will not only reduce shopping time but also bring a convenient experience to shoppers. Your shoppers can view product details quickly without leaving the catalog navigation. This makes browsing products easier and faster, which helps increase conversion rates. Products may be added to the cart from the Product Quick View pop-up. more Reduce shopping time, and improve customer experience. Increase your sales. Let customers view the product information, add it to cart in a popup Add to wishlist, compare products
Generate menu items and smart managed by drag & drop. Mega Menu Creator Pro is a responsive, highly customizable, drag and drop menu builder app for Shopify. Its user friendly experience allows creators of all skill levels to design highly navigable mega menus for their Shopify website. Mega Menu Creator Pro is a responsive, highly customizable, drag and drop menu builder app for Shopify. Its user friendly experience allows creators of all skill levels to design highly navigable mega menus for their Shopify website. more Smart menu creator with drag & drop menu builder, no reloads the page. Add any HTML, shortcode, maps, contact forms or widget you like the menu & more. Responsive and touch-enabled for an enhanced mobile/tablet experience. Flexible for custom menu layout and re-order items position instantly. Caching optimized for fastest loading and SEO results.
Build unlimited forms with custom fields easily for contact forms or surveys using Form Builder. Form Builder lets you create unlimited custom forms, including registration forms, contact forms, survey forms, wholesale order forms, multi-step forms, and Typeform-style forms for your Shopify store. With drag-and-drop design, Google reCaptcha, advanced conditional logic, and custom fields, building forms is easier than ever. Fully mobile-responsive, supports file uploads, and works with all Shopify themes. Track UTMs and customize every detail to match your brand. Form Builder lets you create unlimited custom forms, including registration forms, contact forms, survey forms, wholesale order forms, multi-step forms, and Typeform-style forms for your Shopify store. With drag-and-drop design, Google reCaptcha, advanced conditional logic, and custom fields, building forms is easier than ever. Fully mobile-responsive, supports file uploads, and works with all Shopify themes. Track UTMs and customize every detail to match your brand. more Create custom registration forms, contact forms, survey & more with file uploads Design your forms by using advanced conditional and dynamic field logic Personalized forms are designed to fit the aesthetic of your shop We provide immense storage amounts, allowing you to upload more files Use Form Builder to connect your custom email domains to other apps seamlessly
Run post purchase and NPS surveys to collect customer feedback on Thank You & checkout pages. Hulk NPS Post Purchase Survey collects customer feedback on checkout, Thank You and Order Status pages. Build net promoter score (NPS), customer satisfaction (CSAT), and product surveys with drop-downs, checkboxes, radio buttons, and text boxes. Add forms anywhere using checkout blocks - no coding. Personalize questions with conditional logic, collect emails, and get notified of new responses. Sync unlimited responses to Google Sheets or Slack and track insights with analytics. Hulk NPS Post Purchase Survey collects customer feedback on checkout, Thank You and Order Status pages. Build net promoter score (NPS), customer satisfaction (CSAT), and product surveys with drop-downs, checkboxes, radio buttons, and text boxes. Add forms anywhere using checkout blocks - no coding. Personalize questions with conditional logic, collect emails, and get notified of new responses. Sync unlimited responses to Google Sheets or Slack and track insights with analytics. more Run post purchase surveys on Checkout, Thank You and Order Status pages. Conditional logic personalizes each survey question based on prior answers. NPS and rating scores reveal customer satisfaction, behavior & preferences. Build surveys with drop-downs, radio buttons, checkboxes, text & steppers. Export responses or sync survey answers to Slack and Google Sheets.
Add unlimited product options, variants, and swatches with add-on pricing and conditional logic. Hulk Product Options is a product customizer that adds unlimited custom options and variants beyond Shopify's limits. Offer swatches, dropdowns, checkboxes, file uploads, and custom text, with conditional logic that shows or hides options per choice. Boost average order value with add-on pricing - set fixed, percentage, or formula-based charges per option. Apply option sets in bulk across products, track SKUs and inventory, and sell globally with multi-currency, Markets, B2B, and POS support. Hulk Product Options is a product customizer that adds unlimited custom options and variants beyond Shopify's limits. Offer swatches, dropdowns, checkboxes, file uploads, and custom text, with conditional logic that shows or hides options per choice. Boost average order value with add-on pricing - set fixed, percentage, or formula-based charges per option. Apply option sets in bulk across products, track SKUs and inventory, and sell globally with multi-currency, Markets, B2B, and POS support. more Add unlimited product options and variants beyond Shopify's limits. Show or hide options with conditional logic based on each choice. Add-on pricing: apply fixed, percentage, or formula-based charges. Image customizer with swatches, file uploads & Google Font text. Apply option sets in bulk via CSV, with SKU tracking and POS support.
Sticky Add to Cart makes it easier for shoppers to find what they need and buy it quickly Sticky add to cart bar appears after scrolling the product page to attract customers. Customers can quickly add items to their cart using sticky add to cart bar. You can also add multiple notification bars to display discounts or free shipping messages to motivate customers to buy products. Sticky add to cart bar appears after scrolling the product page to attract customers. Customers can quickly add items to their cart using sticky add to cart bar. You can also add multiple notification bars to display discounts or free shipping messages to motivate customers to buy products. more Set bar size medium, small & extra small & Different button design & animation Sticky Add To Cart Bar can set in two positions top & bottom You can Fully Customization of Sticky Add to Cart bar with different settings Hide title, variant & whole bar on mobile and combine variants on mobile
Boost your cart AOV with slide cart, cart popup or cart page & customize them with cart discounts iCart Cart Drawer Cart Upsell is an all-in-one upselling and cross-selling app to boost pre-purchase sales & AOV. Add a slide cart drawer, cart popup, or cart page with an easy-to-use no-code cart editor. Motivate customers to add more products with personalized cart discounts, BOGO offers and free gifts. So why wait now? Reduce cart abandonment with iCart’s powerful widgets like AI-powered product upsell, cross sell, cart bundle, free shipping bar/progress bar, delivery date picker & more. iCart Cart Drawer Cart Upsell is an all-in-one upselling and cross-selling app to boost pre-purchase sales & AOV. Add a slide cart drawer, cart popup, or cart page with an easy-to-use no-code cart editor. Motivate customers to add more products with personalized cart discounts, BOGO offers and free gifts. So why wait now? Reduce cart abandonment with iCart’s powerful widgets like AI-powered product upsell, cross sell, cart bundle, free shipping bar/progress bar, delivery date picker & more. more Sticky cart drawer: Replace basic cart with a side cart drawer or cart popup In cart upsell & cross sell: Boost AOV with product upsell & recommendations Progress bar: Encourage customers to buy more with a free shipping bar Cart discount: Boost revenue with volume discount, free product & BOGO offers Cart timer: Show urgency in slide cart offers with a countdown timer
Increase AOV w/Targeted Upsell & Cross Sell Offers. Product Page, In Cart, Pop-ups, & Post Purchase! Boost order values with In Cart Upsell & Cross-Sell app & create customized cart & post purchase upsell & cross-sell offers. Personalize shoppers experience w/ conditional logic & triggers. Perfect your upsell strategy with A/B testing on product upsell & cross-sell offers. Analyze effectiveness with an intuitive upselling dashboard. Post Purchase upselling & cross selling is easy with an in cart upsell cart app with 3 minute setup. This robust upsells app maximizes upselling and cross-selling. Boost order values with In Cart Upsell & Cross-Sell app & create customized cart & post purchase upsell & cross-sell offers. Personalize shoppers experience w/ conditional logic & triggers. Perfect your upsell strategy with A/B testing on product upsell & cross-sell offers. Analyze effectiveness with an intuitive upselling dashboard. Post Purchase upselling & cross selling is easy with an in cart upsell cart app with 3 minute setup. This robust upsells app maximizes upselling and cross-selling. more Maximize AOV with upsells on cart page/drawer, product pages & post purchase Set triggers & rules for efficiently targeted cart upsell & cross-sell offers Drive extra revenue with our robust pre and post-purchase upsell capability Fine-tune upsell cart strategies with a smart, easy to read analytics dashboard AI-autopilot feature to power the perfect automatic upselling and cross-selling
Size Chart & Size Guide: Your seamless solution for precise sizing guidance, reduce return. Effortless sizing with ILM Size Chart & Size Guide app. Add multiple size chart templates, customize each size chart with images, videos, tabs, and custom CSS. Every size chart is mobile and desktop friendly. Display a size chart using app blocks on Shopify 2.0. Support unit conversion between cm and inches. Upload images or use the built-in library to enhance each size chart. Create a clear, consistent, and powerful size chart experience. Effortless sizing with ILM Size Chart & Size Guide app. Add multiple size chart templates, customize each size chart with images, videos, tabs, and custom CSS. Every size chart is mobile and desktop friendly. Display a size chart using app blocks on Shopify 2.0. Support unit conversion between cm and inches. Upload images or use the built-in library to enhance each size chart. Create a clear, consistent, and powerful size chart experience. more Pre-made size chart templates & add multiple size tables, Images, Text, Videos. Assign size chart to specific collections, products, vendors, types and tags. Choose from versatile display options: Floating, Inline, or Block size chart. Auto Translate your size chart into multiple languages with just a few clicks. Unit Conversion between cm, inches and CSS customization in size charts
Create beautiful image sliders, banner sliders, logo carousels, and lookbook without coding Image Slider Pro helps you create banner sliders, logo carousels, and lookbook-style sliders in just a few steps. Upload multiple images, control slider speed, add captions, and link each image to products, collections, pages, or external URLs. The app is mobile responsive and designed to help merchants display visual content in a clean, professional way. The Shopify App Store listing highlights features including bulk image upload, custom styles, captions, hover effects & scheduling. Image Slider Pro helps you create banner sliders, logo carousels, and lookbook-style sliders in just a few steps. Upload multiple images, control slider speed, add captions, and link each image to products, collections, pages, or external URLs. The app is mobile responsive and designed to help merchants display visual content in a clean, professional way. The Shopify App Store listing highlights features including bulk image upload, custom styles, captions, hover effects & scheduling. more Customize speed and add text and links to images from the backend effectively Redirect customers to products or external links when they click the images Install logo slider anywhere on your store home page or products/collection page
Shoppable Instagram feed with different Grid / Slider layouts and lot of customization options. Instafeed / Instagram feed gallery with many customization options enables merchant to display Instagram gallery as a grid, slider. Auto and real time sync with Instagram. Light weight custom video galleries on page, easy to setup with theme editor. Instagram gallery using official Facebook API. Login with Facebook or Instagram in your own account & display instafeed from your Instagram account. Make shoppable instafeed, reels & stories with product tagging on Instagram picture. Instafeed / Instagram feed gallery with many customization options enables merchant to display Instagram gallery as a grid, slider. Auto and real time sync with Instagram. Light weight custom video galleries on page, easy to setup with theme editor. Instagram gallery using official Facebook API. Login with Facebook or Instagram in your own account & display instafeed from your Instagram account. Make shoppable instafeed, reels & stories with product tagging on Instagram picture. more Tag products to make it shoppable instagram feed. Tag unlimited products Attractive popup & gallery layouts help you to get instagram followers Social proof with user generated contents. Increase brand awareness w/ instafeed No Branding, Connect with Facebook / Instagram, Hide / Show Images Open image in popup or redirect to instagram link from instagram feed
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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.