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Custom CSS Shopify Apps

Discover the best Custom CSS apps for your Shopify store in 2026. Compare features, pricing, and reviews to find the perfect solution.

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We've analyzed thousands of custom css apps to identify the top performers based on ratings and install counts.

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By utilizing the C: Year Make Model Search, your customers can efficiently discover products. Our C: Year Make Model Search App enables swift navigation through a vast product catalog across various stores such as Vehicle, Bike, Cars, Boats, Printer, Cartridges, Parts, Audio Systems, Air Conditioning and Electronics parts finder along with Tires and Wheels. Additionally, you can construct personalized search drop-downs according to specific categories such as Year Make Model Sub-Model Engine or Printer Brand Series Model or Wheel Width Diameter Offset for seamless browsing. Our C: Year Make Model Search App enables swift navigation through a vast product catalog across various stores such as Vehicle, Bike, Cars, Boats, Printer, Cartridges, Parts, Audio Systems, Air Conditioning and Electronics parts finder along with Tires and Wheels. Additionally, you can construct personalized search drop-downs according to specific categories such as Year Make Model Sub-Model Engine or Printer Brand Series Model or Wheel Width Diameter Offset for seamless browsing. more Manage YMM rows by adding them one by one or importing via CSV file. Use "Bulk YMM" to assign multiple YMM rows to multiple products at once. Use "Universal Products" to show in each result irrespective of search criteria. Get YMM information inside orders | Fitment Match and Compatibility Chart. URL Redirect Feature (Custom Redirect/Tag Based/Metafields Based Filtering)

4.8(Reviews)

Event calendar for your store, offering view-only, email signups, and the option to buy tickets. Calee helps you easily add Calendar Events to your storefront. You can create multiple event dates and showcase them on a calendar view or as a list view. You can take event signups or link to any product to buy event tickets. You can also import events from Google Calendar. The app is ideal for brands that want to showcase upcoming promotions, workshop calendar, product launches, event registration etc on event calender on their website. Calee helps you easily add Calendar Events to your storefront. You can create multiple event dates and showcase them on a calendar view or as a list view. You can take event signups or link to any product to buy event tickets. You can also import events from Google Calendar. The app is ideal for brands that want to showcase upcoming promotions, workshop calendar, product launches, event registration etc on event calender on their website. more Showcase upcoming events in Calendar View or List View. Set event as view-only, Email Sign Up or link to product to sell event tickets. Import events from Google Calendar. Setup Recurring Events like very month, every week etc. Contact support for customize calendar to match your brand’s aesthetics.

4.7(Reviews)

Hide/Unpublish sold-out & unavailable variants effortlessly from product pages, search & filters Sold-out and unavailable variants clutter your product pages, frustrate shoppers, and end up costing you sales. Camouflage cleans this up to create a smoother shopping experience for your customers. Now with instant variant hiding: Camouflage can unpublish sold-out or unavailable variants from your sales channels, making them disappear from product pages, search results, collection filters to help you create smarter, and cleaner storefront. Sold-out and unavailable variants clutter your product pages, frustrate shoppers, and end up costing you sales. Camouflage cleans this up to create a smoother shopping experience for your customers. Now with instant variant hiding: Camouflage can unpublish sold-out or unavailable variants from your sales channels, making them disappear from product pages, search results, collection filters to help you create smarter, and cleaner storefront. more Unpublish, hide, disable or strike-through sold-out & unavailable variants Hide/Unpublish any variants with conditions, regardless of inventory Unpublish variants from sales channels of your choice, B2B catalogs and markets Unpublish variants for B2B customers, and from markets Set schedule for unpublishing or hiding of variants

5.0(Reviews)

AI-powered upsell, cross-sell, volume bundles & quantity breaks with built-in cart drawer. Candy Rack displays upsell and cross-sell offers at every stage of the buying journey – product page, cart, checkout, and post-purchase. AI suggests the most relevant products to boost your AOV, powered by your choice of engine, including Google Gemini. New volume bundles and quantity breaks turn single-unit orders into multi-unit ones. It also includes a fast, built-in cart drawer with advanced features like a rewards bar. Built in the EU, no sensitive data collected, fully GDPR-compliant. Candy Rack displays upsell and cross-sell offers at every stage of the buying journey – product page, cart, checkout, and post-purchase. AI suggests the most relevant products to boost your AOV, powered by your choice of engine, including Google Gemini. New volume bundles and quantity breaks turn single-unit orders into multi-unit ones. It also includes a fast, built-in cart drawer with advanced features like a rewards bar. Built in the EU, no sensitive data collected, fully GDPR-compliant. more Offers in 7 different placements: product page, cart, checkout, post-purchase. [NEW] Volume bundles: Tiered quantity pricing on the product page. Cart drawer: Fast slide-out cart with built-in upsell offers and rewards. [NEW] AI mode: Let Candy Rack AI or Google Gemini pick your upsells. A/B testing: Test and optimize your offers to perfection (via Intelligems).

4.9(Reviews)

Easily create irresistible pop-ups and post purchase upsells in order to increase your revenue Cart X is a one click upsell app that allows you to add & manage upsell & cross-sell funnels to reconvert customers. We offer one click upsells (OCU), Pop-up and thank you page in-cart offers. We will help you to Boost your Revenue, Conversion Rate & Average Order Value (AOV). Get your customers rebuy and resell your products easily. Add upsell recommendations, downsells, recharge cross sell, order bump, post checkout upsell, Checkout X upsell, reorder upsells or Free gift with any purchase. Cart X is a one click upsell app that allows you to add & manage upsell & cross-sell funnels to reconvert customers. We offer one click upsells (OCU), Pop-up and thank you page in-cart offers. We will help you to Boost your Revenue, Conversion Rate & Average Order Value (AOV). Get your customers rebuy and resell your products easily. Add upsell recommendations, downsells, recharge cross sell, order bump, post checkout upsell, Checkout X upsell, reorder upsells or Free gift with any purchase. more Add cart pop-up aftersell and Post purchase vitals offers with countdown Easy drag & drop thank you page builder with cross-sell, coupon & discount Reconverting One Click Upsell (OCU), Thank You Page, Checkout Upsell & popup Our analytics allows you to track the best performing funnels & products Sell complementary products, warranties, BOGO, Bundles, Crosells, Upsells & more

5.0(Reviews)

Maximize your store's revenue with cart drawer upsells, exclusive rewards, and seamless add-ons! Maximize your sales effortlessly with cart drawer upsells, rewards, and add-ons. Our app helps merchants elevate their AOV by offering personalized upsells and incentives directly in the cart. Seamlessly integrate rewards and add-ons to enhance the shopping experience and encourage higher spending. Designed for flexibility, our solution ensures a smooth, on-brand experience that keeps customers engaged while driving more revenue. Optimize checkout flow in minutes focus on scaling. Maximize your sales effortlessly with cart drawer upsells, rewards, and add-ons. Our app helps merchants elevate their AOV by offering personalized upsells and incentives directly in the cart. Seamlessly integrate rewards and add-ons to enhance the shopping experience and encourage higher spending. Designed for flexibility, our solution ensures a smooth, on-brand experience that keeps customers engaged while driving more revenue. Optimize checkout flow in minutes focus on scaling. more Add in-cart upselling and cross-selling blocks to maximize your AOV. Drive more purchases with a built-in rewards system and exclusive incentives. Apply add-ons like shipping protection, gift wrapping, and warranties.

5.0(Reviews)

Boost AOV with CartyLabs: In-Cart Upsell, Free Gifts, Rewards & Shipping Bar, Countdown & More Cartylabs Upsell In-Cart supercharges store sales and engagement!. Turn every add-to-cart into revenue with AI-powered Upsell Recommendations, Subscribe & Save, Rewards & Shipping Bars, and Countdown deal. Entice shoppers with Gift Offers, Promo codes, Auto discounts, and more. Build trust with Shipping Estimates and and Ship Protection. Skyrocket Sales with Sticky Add-to-Cart & Quick Buy Now. Enjoy seamless third-party app and theme integrations, real-time analytics, and exceptional support! Cartylabs Upsell In-Cart supercharges store sales and engagement!. Turn every add-to-cart into revenue with AI-powered Upsell Recommendations, Subscribe & Save, Rewards & Shipping Bars, and Countdown deal. Entice shoppers with Gift Offers, Promo codes, Auto discounts, and more. Build trust with Shipping Estimates and and Ship Protection. Skyrocket Sales with Sticky Add-to-Cart & Quick Buy Now. Enjoy seamless third-party app and theme integrations, real-time analytics, and exceptional support! more AI-Upsell Cart: Recommendations Upsells, Rewards, Countdown Deals, Free Gift. Skyrocket Sales with Subscription, Promo, Gift Wrap, Shipping Protection & More Reduce Abandonment with Upsell Offers, Sticky Cart & Cart Reminder Tab Features Boost Sales & Conversions with Quick Buy Now and Sticky Add to Cart Bar Customizable & Personalized Shopping with Real-Time Analytics Behavior& Tracking

5.0(Reviews)

PDF catalog maker for wholesale & retail: catalogs, line sheets & price lists with order forms Create professional PDF catalogs for wholesale and retail in minutes. Import Shopify products in one click and build catalogs, line sheets, and price lists with wholesale pricing and order forms — perfect for trade shows and B2B sales. Add variant tables, metafields, QR/barcodes, swatches, and Canva content in A4 or Letter. Convert any catalog into an interactive flipbook customers can order from, share one cloud link that always stays updated, or print it. No design skills needed. Create professional PDF catalogs for wholesale and retail in minutes. Import Shopify products in one click and build catalogs, line sheets, and price lists with wholesale pricing and order forms — perfect for trade shows and B2B sales. Add variant tables, metafields, QR/barcodes, swatches, and Canva content in A4 or Letter. Convert any catalog into an interactive flipbook customers can order from, share one cloud link that always stays updated, or print it. No design skills needed. more PDF catalog maker, wholesale/retail catalog maker, line sheet, inventory list Use catalog as wholesale channel with wholesale order form & wholesale prices Show variants, metafields, swatches, galleries, QR codes, and barcodes Import products from collections, b2b catalogs & price lists.Password protection CANVA integration and export. SYNC data in PDF catalog in a 1 min.

4.4(Reviews)

Reward spend and engagement between purchases. Tailored to your brand and loved by members. Redefine what customer loyalty means for your brand. Reward purchases and keep members engaged between orders with activities, competitions, and challenges. Tailor your points and tier system with sophisticated rules inspired by programs your customers recognize. Reward any activity with multiple rewards and craft a rewards shop where members can use their points. Full design control for widgets across every part of your program. Auto-localized across Shopify Markets and separate Shopify stores. Redefine what customer loyalty means for your brand. Reward purchases and keep members engaged between orders with activities, competitions, and challenges. Tailor your points and tier system with sophisticated rules inspired by programs your customers recognize. Reward any activity with multiple rewards and craft a rewards shop where members can use their points. Full design control for widgets across every part of your program. Auto-localized across Shopify Markets and separate Shopify stores. more Reward orders in any currency. Tailor points, tiers & milestones to your brand. Run competitions and 50+ activities to engage customers between purchases Profiles & zero-party data: Define, collect, and use member preferences and data Reward any action with discounts, free products, badges, and custom rewards Full design control and automatic localization of every widget for every market

5.0(Reviews)

Customize your Thank you and Order status pages. Only Plus merchants can customize checkout. Checkout Builder gives Shopify Plus merchants full control over Checkout with high-converting, extensible blocks. Add upsells, cross-sells, trust badges, custom messaging, dynamic content, and conditional logic—no code required. Built on Shopify Checkout Extensibility, it’s fast, secure, upgrade-safe, and fully compatible with Shopify updates. Design smarter checkout experiences that increase AOV, reduce friction, and convert more customers. Checkout Builder gives Shopify Plus merchants full control over Checkout with high-converting, extensible blocks. Add upsells, cross-sells, trust badges, custom messaging, dynamic content, and conditional logic—no code required. Built on Shopify Checkout Extensibility, it’s fast, secure, upgrade-safe, and fully compatible with Shopify updates. Design smarter checkout experiences that increase AOV, reduce friction, and convert more customers. more Drag-and-drop checkout blocks built on Shopify Checkout Extensibility Upsells and cross-sells to increase AOV at the point of purchase Conditional logic to show content based on cart, customer, or order Add trust badges, custom text, and branded content to checkout Fast, secure, and upgrade-safe with full Shopify Plus compatibility

5.0(Reviews)

Add upsells and control payments, shipping, and discounts across your checkout — on any plan. Checkout Extensions Pro helps you grow revenue and control your checkout. Add one-click post-purchase upsells after payment, and upsells, surveys, and content on your Thank You and Order Status pages. Set rules to hide, sort, or rename payment and shipping methods by cart conditions, apply condition-based discounts, and block orders by location or age. These work across Shopify plans. On Shopify Plus, also add in-checkout upsell widgets and checkout branding. Setup is guided and takes minutes. Checkout Extensions Pro helps you grow revenue and control your checkout. Add one-click post-purchase upsells after payment, and upsells, surveys, and content on your Thank You and Order Status pages. Set rules to hide, sort, or rename payment and shipping methods by cart conditions, apply condition-based discounts, and block orders by location or age. These work across Shopify plans. On Shopify Plus, also add in-checkout upsell widgets and checkout branding. Setup is guided and takes minutes. more Post-purchase one-click upsells that add to the order without re-payment Thank You and Order Status page upsells, surveys, and content Rules to hide, sort, and rename payment and shipping methods by cart conditions Condition-based checkout discounts and order protection (block by location or ag Shopify Plus: in-checkout upsell widgets and full checkout branding

4.4(Reviews)

Show terms and conditions, return and refund policy on cart page so that there are less chargebacks You can see date and time when the customer has accepted terms. Customize Behaviour how you would like to show terms or refund policy: You can show it in new tab or popup Just install app and configure it in theme customization page. No theme code is modified by the app, it is using latest app blocks feature. You can see date and time when the customer has accepted terms. Customize Behaviour how you would like to show terms or refund policy: You can show it in new tab or popup Just install app and configure it in theme customization page. No theme code is modified by the app, it is using latest app blocks feature. more No Code Required: Store when the terms were accepted within Order page Pop Up Support: Use existing page or create new one and show in pop-up. Customization: Customise the behaviour easily with ultimate options in app. Side Cart Support: Support on cart and side cart page.

4.5(Reviews)

Your all-in-one solution for Sweepstakes. Get set up in minutes with customizable widgets! Reward customers for every purchase made, turning everyday transactions into exciting opportunities to win. Set up a sweepstake in minutes with our widgets, banners, and checkout extensions. Encourage higher spending by offering bonus entries at spending criterias. Leverage our referral program, Every shopper receives a personalized referral code to share, helping you attract new buyers organically through word-of-mouth. No coding or product metadata workarounds required. Reward customers for every purchase made, turning everyday transactions into exciting opportunities to win. Set up a sweepstake in minutes with our widgets, banners, and checkout extensions. Encourage higher spending by offering bonus entries at spending criterias. Leverage our referral program, Every shopper receives a personalized referral code to share, helping you attract new buyers organically through word-of-mouth. No coding or product metadata workarounds required. more No-Code customization widgets and banners for seamless integration Purchase-based giveaways configurable (e.g. $1 spent = 1 entry) Upsell customers with spend-based rewards (e.g. spend $100+ unlock more entries) Referral program to turn loyal customers into brand advocates! Send branded post-purchased emails with sweepstake details & referral codes

5.0(Reviews)

Add clickable video and image banners and schedule start/end dates for promos and hero banner. Add a clickable image banner, video banner, or mixed media banner to your store. Combine images and videos in the same hero banner, each fully clickable and linked to any product, collection or external URL. Schedule image banners and video banners to publish and unpublish automatically, perfect for for sales, launches or testing new creatives. Upload separate desktop and mobile images and videos for each banner. Add a clickable image banner, video banner, or mixed media banner to your store. Combine images and videos in the same hero banner, each fully clickable and linked to any product, collection or external URL. Schedule image banners and video banners to publish and unpublish automatically, perfect for for sales, launches or testing new creatives. Upload separate desktop and mobile images and videos for each banner. more Clickable Image & Video Banners Automated Banner Scheduling Mobile-friendly: Use different media for desktop and mobile shoppers Flexible Styling Options Split Banner Options With Mixed Media

3.4(Reviews)

Drive in-store sales with quality, design, and customization worthy of your brand Closeby makes it easy to create a store locator that perfectly matches your brand. It's how online customers become in-store sales for Shopify businesses with physical locations. Closeby makes it easy to create a store locator that perfectly matches your brand. It's how online customers become in-store sales for Shopify businesses with physical locations. more Configurable: 50+ settings Easy setup: no design or engineering experience required Extensive customization: select design options that best express your brand Beautiful UX: Mobile-friendly, feature-rich and easy to use for customers Integrated: Sync with Google Sheets and Google Analytics for teams

4.9(Reviews)

Create fully customizable, mobile-friendly comparison tables for your store Comparing features between multiple products, plans, or offers is a key step in every shopper’s decision process. With Comparison Tables by Common Ninja, you can create clean, responsive tables that present features, specs, and prices side-by-side. Customize the design to match your store, highlight key differences, add call-to-action buttons, and guide customers toward the right choice quickly and confidently. Comparing features between multiple products, plans, or offers is a key step in every shopper’s decision process. With Comparison Tables by Common Ninja, you can create clean, responsive tables that present features, specs, and prices side-by-side. Customize the design to match your store, highlight key differences, add call-to-action buttons, and guide customers toward the right choice quickly and confidently. more Advanced search & sort to help customers quickly find and compare key details. Floating headers keep column and row titles visible while scrolling long tables. Pagination for easy navigation through long, data-rich comparison tables. Import CSV files instantly and turn them into ready-to-use comparison tables. Fully responsive design that adapts beautifully to desktop, tablet, and mobile.

5.0(Reviews)

Boost Your Sales with COD Order Form! Add Discounts, Upsells & More to Maximize Sales! Supercharge your cash-on-delivery store with CodMonster! Enjoy a fast shopping experience with our 1-click customizable COD form. Boost your Average Order Value (AOV) through smart Upsell and Cross-Sell offers while recovering abandoned carts. Track ad performance on Facebook, TikTok, and Google with multi-pixel tracking. Easily integrate with partners like CODPartner and CODNetwork. Take control of your sales and watch your business grow with CodMonster’s powerful, user-friendly tools today! Supercharge your cash-on-delivery store with CodMonster! Enjoy a fast shopping experience with our 1-click customizable COD form. Boost your Average Order Value (AOV) through smart Upsell and Cross-Sell offers while recovering abandoned carts. Track ad performance on Facebook, TikTok, and Google with multi-pixel tracking. Easily integrate with partners like CODPartner and CODNetwork. Take control of your sales and watch your business grow with CodMonster’s powerful, user-friendly tools today! more Customizable Popup/Embedded Form: Create flexible COD forms with field control. Upsell & Cross-Sell Offers: Boost AOV with one-click upsells and quantity offers Multi-Pixel Tracking: Track ads on Facebook, TikTok, Snapchat, and Google. Google Sheets Integration: Sync orders with Google Sheets, Shopify, and apps. Order Limits & Restrictions: Limit orders and restrict form display by country.

3.9(Reviews)

Sticky, Scrolling & Animated Announcement Bar for Flash Sales & Promotions Add powerful announcement bars to your store in minutes — no code needed. Choose from sticky headers, smooth scrolling marquees, rotating carousels, or animated sliding bars. Display flash sale countdowns, shipping offers, and promo codes exactly where shoppers look. Target by location, page, or schedule to show the right message at the right time. Each bar includes a customizable call-to-action button to drive clicks and conversions. Works perfectly on mobile and desktop. Add powerful announcement bars to your store in minutes — no code needed. Choose from sticky headers, smooth scrolling marquees, rotating carousels, or animated sliding bars. Display flash sale countdowns, shipping offers, and promo codes exactly where shoppers look. Target by location, page, or schedule to show the right message at the right time. Each bar includes a customizable call-to-action button to drive clicks and conversions. Works perfectly on mobile and desktop. more Sticky & Scrolling Bars: Keep promos visible with marquee or fixed header bars Rotating Carousel: Cycle multiple offers with smooth animated transitions Geo & Page Targeting: Show location-based offers on specific store pages Scheduling & CTA Button: Set sale dates and drive clicks with action buttons Mobile Responsive & Multi-Bar: Run multiple bars, perfectly on every device

0.0(Reviews)

Skip the plain dropdown. Show variants options as a Product Variant color swatch or Product Swatch. Your variant picker doesn't have to be a plain dropdown. Show every variant option as a color swatch, variant swatch or variant selector for each product variant, on product & collection pages. Show every variation of your product variants as one clean, easy swatch. Add a New badge, Sale badge & Sold-out badges, grey out out-of-stock combos & link a size chart. Bulk upload color swatches by CSV. See live analytics. Works with Shopify Markets & B2B. Free setup from our product variants experts. Your variant picker doesn't have to be a plain dropdown. Show every variant option as a color swatch, variant swatch or variant selector for each product variant, on product & collection pages. Show every variation of your product variants as one clean, easy swatch. Add a New badge, Sale badge & Sold-out badges, grey out out-of-stock combos & link a size chart. Bulk upload color swatches by CSV. See live analytics. Works with Shopify Markets & B2B. Free setup from our product variants experts. more Variant Swatches: Color swatches, Image swatch, Custom variant image swatch Variant Picker: Show as Swatches, Buttons & Dropdowns with price, Label & Badges Show variants on collection pages as color swatches, not just one product image. Bulk upload color swatches for product variants. Hide out of stock variants Works with Shopify Markets, B2B & size charts. A variant image becomes a swatch.

4.9(Reviews)

Collect product details, schedule dates, and price options before checkout COLY helps with adding required product forms to selected Shopify products. Customers fill in the details before checkout, and the answers follow the order so fulfillment teams can pack, personalize, export, price, and support the order with fewer follow-up messages. COLY helps with adding required product forms to selected Shopify products. Customers fill in the details before checkout, and the answers follow the order so fulfillment teams can pack, personalize, export, price, and support the order with fewer follow-up messages. more 12 field types: Textfield, select, date picker, radio box, checkbox & more Schedules: Date rules for delivery, pickup & appointments Display conditions: Display on selected product by product, vendor, type and tag Export order line properties to CSV or XLSX excel file Checkout rules: Collect extra service fees, tax & dynamic pricing

5.0(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.