A/B Test Your Webflow Website
The fastest A/B testing solution for Webflow. No-code visual editor, head-code setup, and powerful analytics—without slowing down your site.
🚀 Trusted by Webflow designers and marketers
Set up A/B testing on your Webflow site in under 60 seconds
How it works on Webflow
Install the Stellar snippet
Add one line of code to your Webflow site head. Direct installation is recommended for anti-flicker and fastest variant delivery.
Create an experiment and variants
Use the no-code visual editor to change headlines, buttons, images, or layout on live pages—no redeploy required.
Configure targeting rules
Limit experiments to specific URLs, devices, or countries so tests only run for the audience that matters.
Add conversion goals
Track Webflow form submissions, button clicks, or multi-step funnel page visits across your marketing site.
Analyze results and ship winners
Review real-time stats in Stellar, optionally sync conversions to GA4, and apply the winning variant.
Install the Stellar snippet on Webflow
Paste your snippet in Project Settings → Custom Code → Head Code. Direct head install is recommended so anti-flicker works correctly. Full install guide →
- In Webflow Designer, open Project Settings → Custom Code
- Paste your Stellar snippet in the Head Code field
- Save settings and Publish the site to staging or production
- Open a published URL and confirm stellar.js loads before </head>
Unpublished Designer previews do not reflect custom head code. Always QA on a published Webflow URL.
Pre-launch QA checklist
Run through this list before sending traffic to an experiment on Webflow.
- Confirm stellar.js loads in the Network tab on pages where experiments should run
- Verify only one install path is active (direct head install or GTM—not both)
- Match anti-flicker settings to your install method (direct install recommended)
- Clear CDN, theme, or platform cache after saving snippet changes
- Test in an incognito window with ad blockers disabled
- Publish after every head code change (staging or production)
- Confirm snippet on both webflow.io subdomain and custom domain if both are used
- Test CMS template pages, not only static pages, if experiments target collection items
- Verify Webflow hosting CDN cache cleared after publish
Webflow limitations and gotchas
Publish required
Custom code only applies to published sites. Experiments must be validated on live published URLs.
Webflow Ecommerce checkout
Checkout may limit third-party scripts compared to marketing pages. Focus storefront tests on pre-checkout pages unless checkout tracking is explicitly validated.
Interactions and IX2
Heavy Webflow interactions can shift layout after load. Combine anti-flicker with careful variant design on animated heroes.
GA4 tracking for Webflow experiments
Stellar sends conversion events to Google Analytics 4 via the Measurement Protocol, so experiment data appears alongside your other Webflow analytics. GA4 integration setup →
Event name: stellar_experiment_conversion
Register these custom dimensions in GA4 (Event scope):
experiment_id,experiment_namevariant_id,variant_nameconversion_id,conversion_name
Keep your Webflow site fast while you test
Stellar's 5.4KB async snippet loads without the bloat of legacy testing platforms—important for SEO and Core Web Vitals on Webflow.
At just 5.4KB and served on a CDN, Stellar's pure JS script is 25x smaller than competitors like VWO or AB Tasty. With minimal dependencies and a fixed size regardless of test count, it preserves your website's speed, Core Web Vitals, user experience, and SEO performance.
Why teams choose Stellar for Webflow
Webflow A/B test ideas to run first
Marketing hero sections
Test hero copy, layout, and CTA on Webflow marketing sites.
Landing pages
Optimize dedicated campaign landers built in Webflow.
Lead gen forms
Test Webflow form fields and submit button placement.
Ecommerce product pages
Test product template layouts on Webflow Ecommerce PDPs.
Mobile navigation
Compare mobile menu vs. sticky CTA patterns.
CMS collection templates
Run template-level tests across CMS-driven landing pages.
Pricing
Free
Up to 25k MTU
Built-in analytics
Visual web editor
Custom CSS & JS editor
AI editor assistant
Basic A/B testing
Up to 3 variants per experiment
Up to 2 experiments running simultaneously
Pro
50k MTU included
Unlimited variants
Unlimited concurrent experiments
Advanced targeting rules
Dynamic keyword insertion
AI insights & recommendations
Priority support
Enterprise
Custom MTU volume
Custom solutions
Integrations support
We dynamically bill in small increments of 1k MTU, so you only pay for what you actually use and never overpay
No hidden fees, no large fixed blocks. Scale smoothly as your traffic grows with predictable, usage-based billing
We only count users who actually see experiments. Multiple experiment views from the same user count as just 1 MTU
Trusted by marketers running experiments
Jake M. — Performance Marketer
⭐️⭐️⭐️⭐️⭐️
Other testing tools have a million features I don't need. Stellar focuses on what actually matters: speed, ease of use, and great analytics.
Richard R. — E-commerce Owner
⭐️⭐️⭐️⭐️⭐️
Stellar is the real deal. No unnecessary features, no steep learning curve. Just quick tests that actually improve our store.
Ben C. — Growth Hacker
⭐️⭐️⭐️⭐️⭐️
It does the job without slowing down our pages. If you're running tests and care about performance, this is the tool to use.
Frequently Asked Questions
More platforms
Stellar works on any site where you can add head code. Explore setup guides for other platforms: