10 Best Shopify Apps for Fashion Stores to Increase Revenue in 2026

The following 10 apps work together as a system, starting with the most foundational:

​​Quick Reference: Top 10 Shopify Apps at a Glance

1. Search App

   Customers can't buy what they can't find. With a small catalog you can get away with standard Shopify search, but once you get over 150 products a dedicated search app that understands your catalog the same way you and your customers do becomes essential. Customers who are searching have much higher intent to buy - if you're not helping them find what they're looking for, you're leaving revenue on the table.

   Traditional keyword search might seem adequate, but fashion e-commerce has unique search challenges that basic search can't solve. Style descriptors, occasion-based queries, and vibe searches require semantic understanding that goes beyond simple keyword matching.

   Fashion has specific search challenges around occasions, style descriptors and vibes, so it's worth using an app that understands this, like Substanz. Stores using Substanz have seen up to a 15x increase in conversions for search users. It installs in minutes and the value gained will be seen in days.

   Substanz is available for a flat rate of $69/month regardless of catalog size or number of sessions.

   Want to understand the technology behind this? Learn about the difference between semantic search and keyword search and why it matters for fashion stores. For a detailed breakdown of how AI search can increase your conversion rate by 20%+ and the exact ROI calculations, check out our guide.

   
   

2. Size/Fit Solutions

   For DTC brands this is especially crucial as customers may not be familiar with your fits and what a “medium” really means in your brand. By having a high quality size fit solution you give customers the confidence to purchase in the first place and also reduce the likelihood that they will return an item because it wasn't the fit they were expecting.

   Size and fit issues account for 67% of fashion returns, with fashion apparel return rates averaging 24-26%—significantly higher than most other e-commerce categories. Even more concerning, 53% of apparel retailers cite size/fit as the top reason for returns. Retailers using AI-powered fit prediction tools see size-related return reductions of 27% on average.

   Kiwi Size Chart offers a free plan with 2 size charts, with premium plans starting at $6.99/month for unlimited charts and advanced features such as fit recommendations, and auto unit conversion for US/UK/EU sizing.

   
   

3. Email Marketing 

   Once you’ve captured your customers' emails - use them! By setting up workflows that email when carts are abandoned, or seasonal campaigns, you can capture customers when they are ready to purchase. Fashion retail is especially great for email marketing due to its visual, seasonal, and trend-driven nature.

   Email marketing accounts for 16.3% of fashion e-commerce sales. Abandoned cart email flows have 7.6% click rate, 3.9% conversion rate, and $3.93 revenue per recipient. Welcome email flows for fashion brands average 6.25% click rate, 2.12% conversion rate, and $2.35 revenue per recipient. Post-purchase emails enjoy 217% higher open rates than traditional emails.

   Klaviyo is the industry standard for fashion stores, offering automated flows, segmentation, and SMS integration. Klaviyo is free for up to 250 contacts and 500 monthly emails, with paid plans starting at $20/month as your list grows

   
   

4. Reviews & Social Proof 

   With reviews and social proof apps customers can see real people, just like them, in the same garments. This is an extra win for stores that stock a wide range of sizes—while you might not be able to justify shooting products on multiple body types, customer photos do this work for you. The reviews help build trust, and trust drives conversions, especially for customers who are new to your store. Bonus—it's like free product feedback which you can use to inform future collections.

   Online clothing stores displaying reviews saw conversion rates increase by 23%. Products with 5 reviews have 270% greater purchase likelihood than products with no reviews. Product reviews consistently demonstrate conversion lifts of 10-30%, and for higher-priced fashion products, reviews increase conversion rates by 380%.

   Judge.me is the highest-rated option with photo/video reviews and automated collection. Judge.me offers a robust free plan with unlimited reviews, while the Awesome plan ($15/month) unlocks advanced widgets and customization.

   
   

5. Post-Purchase Edits 

   The sale doesn't have to end at checkout. By installing a post-purchase edit app, customers can add items to existing orders instead of placing new ones (which means they can combine shipping, making it seem like a free win for them). Customers can also make edits to addresses, which helps reduce cancellations (the refund fees cut in even if they remake the order) and reduces customer service burden. You can drive additional revenue from existing buyers.

   OrderEditing.com allows customers to add items and change addresses post-purchase, starting at $99/month.

   
   

6. Pre-Orders & Back-in-Stock Alerts 

   Every out-of-stock product is a lost sale unless you capture that intent. It also helps inform your purchasing strategy to understand both what people would like to see more of and sizing—did people want more of this item/size or had you sold completely to demand? Pre-orders let you sell before inventory arrives, helping with cashflow and helping stores right-size their orders to their factories/suppliers based on demand. Back-in-stock alerts bring customers back when items return, giving a new touchpoint and good reason to get in touch with customers.

   Global retailers lose $1.2 trillion annually from out-of-stock situations, with fashion hit harder than almost any other sector (online out-of-stock rates often exceed 15%). 69% of online shoppers will abandon their purchase and shop with a competitor if their desired item is out of stock. Stockouts account for 40% of lost sales. Back-in-stock alert emails achieve a 22.45% average conversion rate.

   Stoq has both pre-orders and back-in-stock alerts in the same app. It's easy to set up and customize across different products and collections, and also works on Shopify POS.

   Stoq offers a free tier with 30 preorders and 100 back in stock alerts, with paid tiers starting at $10/month for up to 100 pre-orders per month.

   
   

7. Loyalty & Rewards 

   Repeat customers spend more and cost less to acquire. Fashion customers are often brand-loyal once they find their fit. Points, VIP tiers, and early access to new collections keep customers coming back.

   Acquiring a new customer costs 5x more than retaining an existing one. A 5% increase in customer retention can boost profits by 25-95%. Repeat customers are 6-7 times cheaper to sell to and spend up to 67% more per purchase. Returning customers spend 3x more per visit than first-time shoppers.

   Smile: Rewards & Loyalty (free plan for up to 200 monthly orders, paid plans from $15/month) offers points, VIP tiers, and referrals with performance benchmarks from similar stores.

   
   

8. Wishlist/Save for Later

   Fashion is browsing-heavy. Customers often discover items they like but aren't ready to buy immediately (waiting for payday, considering options, showing partners). Wishlist captures that intent and gives you a reason to bring them back through price drop alerts, low stock notifications on saved items, and "your wishlist is waiting" emails.

   Sales increased by 19.3% on average after implementing wishlists. With 75% cart abandonment rates, wishlists offer an alternative that captures intent without the pressure of checkout. Wishlist email campaigns can drive open rates as high as 80% and 5x-10x higher return to purchase rates. 40% of customers think a wishlist would improve their shopping experience.

   Swym Wishlist Plus (used by 40,000+ brands) offers email automation, price drop alerts, and back-in-stock notifications. Swym offers a free plan for up to 500 wishlist items, with the Starter plan at $19.99/month for 1000 wishlist actions and advanced features.

   
   

9. Checkout Upsells

   Increasing average order value without adding traffic. The moment right before payment is prime for strategic upselling. Accessories, complementary items, "complete the look" suggestions—all can significantly boost your average order value.

   Upselling and cross-selling programs lift revenue and AOV by 10-30% on average. Product bundles increase AOV by 20-30% on average. Cross-selling contributes 10-30% of total e-commerce revenues. Post-purchase upsells achieve open rates 217% higher and click rates 500% above standard campaigns, with average conversion rates of 6.8%.

   Aftersell has one click personalized after order upsells starting at $34.99/month.

   
   

10. Image Optimization 

    Fashion stores rely heavily on high-quality imaging to drive conversions. But there is a trade-off. High-resolution images often slow down pages, which is especially critical on mobile where images regularly make up nearly two-thirds of product web page weight.

    A site that loads in 1 second has an e-commerce conversion rate 2.5x higher than a site that loads in 5 seconds. A 0.1s improvement in load time can lead to an 8.4% increase in conversions in e-commerce. Almost 70% of consumers say page speed impacts their willingness to buy from an online retailer. For every second delay in mobile page load, conversions can fall by up to 20%.

    TinyIMG automatically compresses images to WebP format, reducing page weight without quality loss while maintaining high-resolution appearance. TinyIMG offers a free plan for 50 images per month, with paid plans starting at $14/month for 1,500 images.

    
    

These apps work together as a system, not in isolation, but search lays the foundation—without it, customers can't find products to review, add to wishlists, or buy in bundles. The hidden costs of 'good enough' search include high bounce rates and lost conversions that compound across your entire app stack. Start with search, then identify your next biggest revenue leak (fit? loyalty? checkout?). The right app stack turns your fashion store from "just another Shopify site" into a revenue-generating machine.

Ready to optimize your search experience?

Search is often the starting point—customers need to find products before anything else matters. We'd love to discuss how semantic search specifically helps fashion stores understand occasions, style descriptors, and vibes the way your customers do. Book a demo with Substanz or install the Substanz app on Shopify - 3 minute set up!