What is CustomFit.ai?

CustomFit.ai is a website personalization, A/B testing, and conversion rate optimization (CRO) platform built for direct-to-consumer (D2C) and ecommerce brands. It works on Shopify, Shopify Plus, WooCommerce, BigCommerce, Magento/Adobe Commerce, Salesforce Commerce Cloud, Shopline, Shoplazza, and any custom storefront (Next.js, Remix, Hydrogen). Marketing teams personalize every visitor's experience, run rigorous A/B and multivariate experiments, and optimize landing pages — all without writing code or relying on engineers.

A/B testing (also called split testing) is a controlled experiment where two or more variations of a webpage, element, or experience are shown to different segments of visitors to determine which version performs better against a chosen metric — typically conversion rate, revenue per visitor, or average order value. CustomFit.ai supports client-side, server-side, and multivariate A/B testing with built-in statistical significance reporting.

How is CustomFit.ai different from Intelligems and Shoplift?

Intelligems and Shoplift focus narrowly on Shopify A/B testing and pricing experiments. CustomFit.ai is the all-in-one platform: A/B testing, full website personalization, feature flags, 100+ drop-in widgets, AI Copilot, and a complete CRO analytics suite — at competitive pricing. Most teams that evaluate Intelligems or Shoplift alongside CustomFit.ai choose CustomFit.ai for the breadth of personalization features and the AI Copilot.

How is CustomFit.ai different from Shogun?

Shogun is a page-builder; CustomFit.ai is an experimentation and personalization platform. Many CustomFit.ai customers use Shogun (or Replo, or Pagefly) to build their pages and then use CustomFit.ai to personalize and A/B test those pages. The two are complementary.

Does CustomFit.ai work with Shopify?

CustomFit.ai is platform-agnostic. It runs natively on Shopify and Shopify Plus (including checkout extensibility), WooCommerce, BigCommerce, Magento / Adobe Commerce, Salesforce Commerce Cloud, Shopline, and Shoplazza — plus any custom or headless storefront on Next.js, Remix, Hydrogen, or a plain HTML site. Setup is a single script tag or a one-click app install on supported platforms.

Do I need to know how to code to use CustomFit.ai?

No coding is required. The no-code visual editor lets you click any element on your live store and change copy, images, layout, prices, or CTAs, then ship it as a personalization or A/B test. The AI Copilot goes further — describe the change in plain English and it builds the variant, the audience, and the test for you. Anyone on your marketing team can run experiments on day one.

Can marketers run experiments without developer or IT dependency?

Yes. After a one-time script install, your growth and marketing team owns the entire workflow — building audiences, editing pages, launching A/B tests, and reading results — with zero ongoing developer or IT involvement. No tickets, no waiting on a sprint, no deploys. Engineers are optional and only needed for advanced server-side tests or custom integrations, for which we provide SDKs for Node, React, Next.js, Python, and PHP.

Will CustomFit.ai slow down my site or hurt Core Web Vitals?

No. The CustomFit script is asynchronous and variants are resolved at the edge, so the right version renders on first paint with no flicker and no layout shift. LCP, CLS, and INP stay green, and the SDK adds roughly 12 KB gzipped.

How much does CustomFit.ai cost?

CustomFit.ai uses transparent usage-based pricing with a free trial. Plans scale with monthly tracked visitors and include unlimited users, unlimited experiments, and the full feature set. There are no per-seat fees and no surprise charges. Visit the pricing section for current tiers.

Is CustomFit.ai SOC 2 compliant?

Yes. CustomFit.ai is SOC 2 Type II compliant, GDPR compliant, and CCPA compliant. We support EU data residency, SSO, role-based access control, and full audit logs for enterprise customers.

CustomFit.ai — Personalization, A/B Testing & CRO for Ecom

What is website personalization?

Website personalization is the practice of dynamically changing the content, layout, offers, and product recommendations on a website based on each visitor's traffic source, device, geography, behavior, purchase history, and cart contents. Done well, personalization lifts conversion rate, average order value (AOV), and lifetime value (LTV) — without adding new traffic.

Behavioral targeting — first-time vs. returning, browsing depth, scroll depth, cart abandoners
Audience segmentation — by traffic source, UTM, geography, device, weather, time of day
Product personalization — homepage hero, PDP recommendations, collection sort order, bundle suggestions
Pricing & offer personalization — free-shipping thresholds, discount bands, member pricing

What is A/B testing?

A/B testing — also called split testing — is a controlled experiment that shows two or more variations of a page or element to different visitor segments to determine which performs better against a chosen metric: conversion rate, revenue per visitor, AOV, or downstream LTV. CustomFit.ai supports client-side, server-side, and multivariate experiments with built-in statistical significance reporting and sequential testing.

Hypothesis-driven — write a clear hypothesis, pick a primary metric, pre-register the experiment
Statistical rigor — Bayesian and frequentist analysis, MDE calculator, peeking-safe
Guardrail metrics — protect AOV, revenue, return rate while testing the primary metric
Server-side or client-side — test prices, checkout flows, and backend logic, not just visuals

What is conversion rate optimization (CRO)?

Conversion rate optimization (CRO) is the systematic process of increasing the percentage of visitors who complete a desired action — purchase, add-to-cart, signup, lead. It combines analytics, qualitative research, A/B testing, and personalization in a continuous loop. CustomFit.ai is purpose-built for ecommerce CRO: every feature — from experiments to widgets to AI Copilot — points at one outcome, more revenue from the same traffic.

Discover — session recordings, funnels, heatmaps, friction analysis
Hypothesize — AI Copilot suggests experiments grounded in your data
Test — A/B, multivariate, multi-armed bandits, server-side
Personalize — roll winners out to the right segments, keep testing

What is landing page optimization?

Landing page optimization is the discipline of testing and refining the headline, hero, social proof, CTA, and offer of a landing page to maximize conversions — especially from paid traffic where every visit has a cost. With CustomFit.ai, you can spin up unlimited personalized landing-page variants per traffic source, campaign, or audience, A/B them against your control, and let the winners auto-roll-out — all without engineering tickets.

Per-campaign variants — match the landing page to the ad creative, keyword, and audience
Geo & weather — swap copy and imagery based on visitor location and conditions
Pop-up & nudge testing — test exit intent, scroll triggers, and urgency banners
Form & CTA testing — fields, button copy, color, position, count

Lift conversion by 11–40%with A/B testing & personalization.

Tell us about your store

The numbers behind real customer wins.

It reads your page, learns your brand, then builds the change.

Reads your page

Learns your brand

CustomFeds builds

Self-iterates

Build from a prompt

Run a CRO Page Audit

99+ ready-to-use widgets

Trending blocks & saved templates

Competitor PDP analysis NEW

One workspace for every experiment your growth team runs.

Point, click, personalize. No dev tickets.

Oak Body Wash · 250ml

Experiment: PDP Hero CTA

Bayesian stats, human-readable verdicts.

Every signal you have — geo, device, intent, history.

Top of funnel to bottom of funnel. One platform.

Theme-level A/B testing

Template-level A/B testing

Pricing A/B testing

Discount A/B testing

Shipping A/B testing

Content A/B testing

Split-URL A/B testing

Checkout gateway A/B testing

Simple pricing. No surprises.

Bring your cup of coffee — finish both the coffee and your A/B test launch by the same time.

Install

Design in the editor

Target & launch

Learn & scale

One store. Personalized for every visitor.

A toolbox deep enough for power users. Simple enough for marketers.

A/B, A/A, multivariate, split-URL

Feature flags & rollouts

Copilot — AI execution layer

Geo & device targeting

Theme-level testing

No-flicker rendering

Plugs into the analytics tools you already use.

Build audiences from your funnels

Push experiment data back

Better CRO calculation

Drop-in modules your store was missing.

Shipping meter

Exit-intent offer

Reviews reveal

Smart upsell

Countdown bar

Geo welcome

Announcement bar

Recently viewed

CustomFit.ai runs on every major commerce platform.

Built for every D2C category

What our customers actually say.

Lessons from the people who built D2C.

Investigating the science of A/B testing

Conversion optimization is an operating system

Developing a funnel-focused marketing strategy

Plays well with the stack you already have.

Your data is safe with us.

What is website personalization, A/B testing & conversion rate optimization?

What is website personalization?

What is A/B testing?

What is conversion rate optimization (CRO)?

What is landing page optimization?

CustomFit.ai vs. Intelligems, Shoplift & Shogun.

Questions every growth team asks.

Ship the next experiment this week.

Built for every D2C category