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Custom JavaScript Shopify Apps

Discover the best Custom JavaScript 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 javascript apps to identify the top performers based on ratings and install counts.

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Create strong forms easily with in just 3 steps using our easy-to-use SK Contact Form Builder app Using our Form Builder app, you can create basic to complex forms with predefined templates or from scratch. Our app has templates like Contact Us, Booking, Warranty, Wholesale Inquiry Form which compatible with all themes. Change look & feel of the form as you want using custom CSS. Email will let you know from which page form was submitted. We have SMTP & Klaviyo which add user to specific Klaviyo list. Tag user when form submitted, G-Sheet, Conditional Logic, zapier & more-upto 2GB of storage Using our Form Builder app, you can create basic to complex forms with predefined templates or from scratch. Our app has templates like Contact Us, Booking, Warranty, Wholesale Inquiry Form which compatible with all themes. Change look & feel of the form as you want using custom CSS. Email will let you know from which page form was submitted. We have SMTP & Klaviyo which add user to specific Klaviyo list. Tag user when form submitted, G-Sheet, Conditional Logic, zapier & more-upto 2GB of storage more Create forms, collect customer data, and allow file uploads easily. Create forms with predefined templates and manage forms by drag & drop feature. Easy integrations of the Klaviyo, Gtag, FB Tracking, GSheet Add tag in customer. Tag customer when form is submitted. Like: Wholesaler, Retailer, etc. ⁠Personalized forms are designed to match your shop's style perfectly.

4.8(Reviews)

All-in-one contact form builder app to create custom forms, customer approval features, & lock pages Build custom forms with a powerful form builder app. Create contact forms, customer registration, wholesale (B2B) registration, and product enquiry forms using conditional logic, file uploads, and multi-step layouts. Approve or auto-approve customers, assign tags, and store data in customer metafields. Lock pages, restrict content by login status, and redirect users. Includes SMTP email support, admin notifications, and 404 auto-redirect for better control. Build custom forms with a powerful form builder app. Create contact forms, customer registration, wholesale (B2B) registration, and product enquiry forms using conditional logic, file uploads, and multi-step layouts. Approve or auto-approve customers, assign tags, and store data in customer metafields. Lock pages, restrict content by login status, and redirect users. Includes SMTP email support, admin notifications, and 404 auto-redirect for better control. more Advance registration, Wholesale registration, POS forms, Approve new customers Logical Hide/Show Field, Conditional Logic, Lock Pages, Auto Redirect 404 links Custom form builder, contact form builder Upload fields, Registrations Form builder, Customer registration custom forms with custom email domain (SMTP) Store Data in Customer Metafields, Product enquiry forms, Advance form builder

4.7(Reviews)

Add file upload to any form. Files saved to Google Drive. Works with default and Klaviyo forms. Let your customers upload files directly from your store forms — contact, register, cart, product, or even Klaviyo embedded forms. Files are securely stored in your Google Drive account. Choose a specific Google Drive folder for uploads. Customize file names with dynamic templates using form field values (e.g. customer name, age). Multiple upload fields per form supported. Simple setup: install the theme extension, connect your Google Drive, and configure from the admin panel. Let your customers upload files directly from your store forms — contact, register, cart, product, or even Klaviyo embedded forms. Files are securely stored in your Google Drive account. Choose a specific Google Drive folder for uploads. Customize file names with dynamic templates using form field values (e.g. customer name, age). Multiple upload fields per form supported. Simple setup: install the theme extension, connect your Google Drive, and configure from the admin panel. more Upload files from any form — contact, register, cart, or product page. Files saved directly to your Google Drive with custom folder selection. Custom file names using form data like customer name, age, or date. Works with Klaviyo embedded forms — not just Shopify form builder. Multiple upload fields supported in a single form.

5.0(Reviews)

Vye alerts customers to any item they're searching for. It's not limited to simple restock alerts. Built for shops with ever-changing inventory, including collectibles, trading cards, vintage, consignment and specialty retail. Unlike typical back-in-stock apps that track one product, Vye lets customers save what they're looking for, such as a keyword, collection or vendor and get notified when a match arrives. Create subscription forms with a drag-and-drop editor, design branded email templates and add SMS alerts. Hands-on support that adapts to your store's needs. Built for shops with ever-changing inventory, including collectibles, trading cards, vintage, consignment and specialty retail. Unlike typical back-in-stock apps that track one product, Vye lets customers save what they're looking for, such as a keyword, collection or vendor and get notified when a match arrives. Create subscription forms with a drag-and-drop editor, design branded email templates and add SMS alerts. Hands-on support that adapts to your store's needs. more Notify customers when products match their exact interests, not just restocks Let customers save preferences and subscribe to personalized alerts Create custom subscription forms with a drag-and-drop editor Send email or SMS notifications automatically when new items match Request custom modifications for your store's needs

4.8(Reviews)

Request a Quote with Personalized form, Hide price, Free shipping, Discounts, Deposit & Invoice Empower customers to request quotes from product, collection, home or cart pages. Create multiple customizable forms to show at specific different products. Display quote buttons anywhere of the store at Any Page. Convert cart items to quotes, sent directly to the store owner. Merchants can edit quotes as draft orders, apply discounts, free shipping or shipping cost and email PDF invoices with checkout links, making it easy to engage customers and negotiate to earn the best Win-Win Deals. Empower customers to request quotes from product, collection, home or cart pages. Create multiple customizable forms to show at specific different products. Display quote buttons anywhere of the store at Any Page. Convert cart items to quotes, sent directly to the store owner. Merchants can edit quotes as draft orders, apply discounts, free shipping or shipping cost and email PDF invoices with checkout links, making it easy to engage customers and negotiate to earn the best Win-Win Deals. more Hide price & show add Quote Button at Product, Collection, Home, Cart & any Page Customizable Multiple quote Forms with Options, Preorder for Specific Products Cart-to-Quote feature. Cart Items can be Submitted for Quote Request instantly Quotes to Draft order with added Discount or Free Shipping & email checkout link Invoice with Deposit, PDF Quotes by email, Checkout Link & Admin Quote Creation

5.0(Reviews)

Zeal FormFactory allowing you to create any custom forms with intuitive functionalities. Zeal FormFactory, developed by ZealousWeb, is a highly effective application for creating custom forms with ease. Its intuitive functionalities enable users to create a wide variety of custom forms, saving time and effort. With Zeal FormFactory, building dynamic forms is a breeze, making it a top choice for anyone in need of a powerful form building solution. Zeal FormFactory, developed by ZealousWeb, is a highly effective application for creating custom forms with ease. Its intuitive functionalities enable users to create a wide variety of custom forms, saving time and effort. With Zeal FormFactory, building dynamic forms is a breeze, making it a top choice for anyone in need of a powerful form building solution. more Create and manage multiple custom forms with ease. Customize fields and design to match your brand style. Get form submissions as PDF via email automatically.

3.5(Reviews)

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About Custom JavaScript Apps for Shopify

Custom JavaScript 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 javascript 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 javascript solutions available in the Shopify App Store. Each has been selected based on its functionality, user ratings, and overall value for Shopify merchants.