CustomFit.ai is a Shopify app developer based in India that makes CustomFit AI A/B Testing & CRO, an upsell and cross-sell app on the Shopify App Store. It provides website personalization, a/b testing, and cro for Shopify and d2c brands. Among the 15,357 Shopify brands over $5M that dtcmvp tracks, 20 (0.1%) run CustomFit AI A/B Testing & CRO, #42 of 268 upsell and cross-sell apps by that count. It is rated 5 out of 5 from 20 reviews on the Shopify App Store. CustomFit AI A/B Testing & CRO has 3 plans on the Shopify App Store, from free to $139 a month.
CustomFit.ai runs no-code a/b tests and personalization on your Shopify storefront, swapping headlines, layouts, and product recommendations based on visitor behavior. Built for brands with enough traffic to test into wins instead of guessing at design changes.
What CustomFit.ai does for Shopify brands
- A/B tests on headlines, layouts & PDPs lift conversion across full-year programs
- Frequently Bought Together widgets grow cart size for buyers already checking out
- Personalized product recommendations match shoppers to higher-intent items
- Behavior-triggered upsell nudges add incremental units per order
Overview
CustomFit.ai sells software for A/B testing and personalizing online storefronts without writing code. It lets ecommerce teams change copy, images, offers and layouts, run tests, and see which versions improve conversion and revenue. It is available as a Shopify app and on other ecommerce platforms.
For Shopify brands
- Install from the Shopify App Store and run A/B tests on product pages, themes, prices, and checkout without editing the theme.
- Tests are measured against Shopify order revenue and average order value, not only clicks.
- Marketers can edit the live store with a visual editor and Chrome extension, or describe a change in plain English to AI Copilot, without filing developer tickets.
How it works
A brand installs the app from the Shopify App Store, approves the scopes, and builds tests in the no-code visual editor or with AI Copilot. The site states a typical install takes about 4 minutes, and offers a 14-day free trial with no credit card.
- Built for
- D2C and ecommerce teams on Shopify, WooCommerce, BigCommerce, Shopline, Shoplazza, Magento, Salesforce and other web stacks.
- Pricing
- The website lists a Core plan at $79 per month for up to 10,000 monthly visitors, with a custom plan quoted for higher traffic. The Shopify App Store lists a free plan for development stores and paid plans at $79 and $139 per month for up to 10,000 monthly visitors.
Products
- CustomFit AI A/B Testing & CRO Shopify app for A/B testing and personalizing a store with a no-code AI visual editor
- A/B & Multivariate Testing Client-side, server-side, split-URL and multivariate tests with Bayesian and frequentist statistics
- Website Personalization Changes content, layout, offers and recommendations based on visitor behavior, source and intent
- AI Copilot Turns a plain-English prompt into a live A/B test or personalization
- AI Wingman Shifts traffic toward winning variants automatically using a multi-armed bandit
- Feature Flags Gradual rollouts, percentage-based releases and kill-switches
Integrations
Buyer notes
- 14-day free trial, no credit card required, cancel anytime.
- The website says all plans include unlimited users and unlimited A/B tests and personalization.
- The website lists SOC 2, ISO 27001 and GDPR compliance, plus SSO, SAML and EU data residency.
- The Shopify App Store free plan is for development stores only.
From CustomFit.ai's own site and Shopify App Store listings, as of 2026-10-30.
Among Shopify brands over $5M
On the Shopify App Store
CustomFit AI A/B Testing & CRO
5.0 · 20 reviewsFree planPaid from $79/moOn 0.1% of brands over $5MLaunched 2023Upsell and cross-sellEasily A/B test or Personalize Shopify website with AI-Powered No-Code Visual Editor to AB test anything: Themes/store AB test, Pricing A/B test, PDP A/B test
Pricing
Free (Dev stores)Free- Only for dev stores, 14 days trial
- 1 A/B Testing
- 1 Personalization campaigns
- No-code AI Visual Editor
- +2 more
10000 visitors/mo$79/monthor $799/year and save 16%- Upto 10,000 Monthly Unique Visitors
- Unlimited A/B Testing
- Unlimited Personalization campaigns
- No-code AI Visual Editor
- +1 more
Upto 10000 Monthly$139/monthor $1,399/year and save 16%- Unlimited A/B Testing
- Unlimited Personalization campaigns
- No-code AI Visual Editor
- AI Copilot
- +1 more
Ratings, reviews, plans, prices and descriptions as the Shopify App Store lists them. how we count.
Alternatives to CustomFit.ai
The most used upsell and cross-sell apps among Shopify brands over $5M.
| App | Brands over $5M | App Store |
|---|---|---|
| Visually A/B Testing & CRO · Visually.io | 2.7% | 4.8 · 147 |
| Revy Unlimited UpSell Offers · Revy Apps | 2.4% | 4.7 · 80 |
| Essential Upsell & Cross Sell · Essential Bundles & Upsells | 2.1% | 5.0 · 2,441 |
| One Click Upsell · Zipify Apps | 2.1% | 4.6 · 568 |
| Navidium Shipping Protection · Navidium Apps | 2% | 4.7 · 397 |
| Bold AI Upsell & Cross‑Sell · Bold | 1.7% | 4.4 · 595 |
Often used with CustomFit.ai
What its brands run more often than Shopify brands over $5M do overall.
- LimeChat55% of its brands · 150.8x average
- Shiprocket50% of its brands · 36x average
- Kwik COD & Checkout70% of its brands · 20.8x average
- Judge.me Product Reviews App60% of its brands · 1.9x average
What Shopify apps does CustomFit.ai make?
CustomFit.ai has 1 app on the Shopify App Store: CustomFit AI A/B Testing & CRO.
How many Shopify brands use CustomFit.ai?
Among the 15,357 Shopify brands over $5M that dtcmvp tracks, 20 (0.1%) run CustomFit AI A/B Testing & CRO, #42 of 268 upsell and cross-sell apps by that count.
What are the alternatives to CustomFit.ai?
The most used upsell and cross-sell apps among Shopify brands over $5M, after CustomFit.ai: Visually A/B Testing & CRO (2.7%), Revy Unlimited UpSell Offers (2.4%), Essential Upsell & Cross Sell (2.1%), One Click Upsell (2.1%), Navidium Shipping Protection (2%) and Bold AI Upsell & Cross‑Sell (1.7%).
What do CustomFit.ai's brands use alongside it?
Of the brands running CustomFit.ai, 55% also run LimeChat, 50% also run Shiprocket, 70% also run Kwik COD & Checkout and 60% also run Judge.me Product Reviews App. Each is at least 1.9 times as common among them as across all brands over $5M.
How is CustomFit AI A/B Testing & CRO rated?
CustomFit AI A/B Testing & CRO is rated 5 out of 5 from 20 reviews on the Shopify App Store.
How much does CustomFit.ai cost?
CustomFit AI A/B Testing & CRO has 3 plans on the Shopify App Store, from free to $139 a month. CustomFit AI A/B Testing & CRO: Free (Dev stores), Free; 10000 visitors/mo, $79/month; Upto 10000 Monthly, $139/month.
