A/B test any website
Built for speed and simplicity. A streamlined alternative to complex testing tools.
Works with your favorite tools
Launch with us in <60 seconds
What makes us stand out
Fastest in the market, built for speed and simplicity
Stellar’s script is ultra-lightweight at just 5.4KB, making it up to 25x smaller than competitors like VWO or AB Tasty. Built with pure JavaScript and decluttered from unnecessary dependencies, it ensures minimal impact on your website’s speed and Core Web Vitals. Unlike other tools that grow heavier with each test, Stellar’s fixed-size script keeps your site fast, responsive, and optimized for both user experience and SEO—no matter how many experiments you run.
Create variants with our visual editor.
No-code visual editor
Install our snippet to access a WYSIWYG editor directly on your site. Works with any website.
Dynamic Keyword Insertion
Personalize your landing pages copy with dynamic keyword insertion. Great for PPC campaigns. Zero coding required.
Custom JS and CSS
Add custom JavaScript and CSS for more granular control over your page. Perfect for advanced tweaks and precise adjustments.
Easy Goal Setup
Set your goals in seconds with a simple interface. Choose from page visits, time spent on a page, or specific user actions—no coding needed.
Advanced Goal Tracking
Track custom user events like button clicks, form submissions, or video plays. Combine multiple goals for a more comprehensive view of performance.
Track conversions, effortlessly.
Real time analytics. Integrates with GA4.
Real time data
See your data in real time with a straight forward interface. Understand exactly what's happening with each variant.
Integrates with GA4
Easily integrate your Stellar data with GA4 or other tools such as Segment or Mixpanel.
Message-match your landing page for every ad
Turn ad clicks into conversions by aligning your landing page with customer intent. Message match headlines, visuals, and CTAs to ad keywords and copy.
Stunning Kitchen Interiors in 45 days
Stunning Kitchen Interiors in 45 days
Get your dream modular kitchen today at affordable rates
Turn visitors into engaged customers with content personalization
Unlock real-time personalization for your visitors. Leverage behavior cues and interaction signals and geo data to adapt web content dynamically,
Year-Round Radiance for New York's Changing Weather
Radiance That Lasts Through New York's Summers, Winters, and Rainy Days!
Stay Cool and Radiant, No Matter the Texas Heat
Radiance That Withstands the Texas Heat, Protecting Your Glow All Year Long.
Split test your way to market fit and beyond
A solid product, but don't take our word for it
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.
Lauren K. — Growth Marketer
⭐️⭐️⭐️⭐️⭐️
Setting up my first test took literally two minutes. No extra steps, just straight to the point. Love how lightweight it is. Zero impact on load speed. Easily the best testing tool I've used.
Jason B. — CRO Specialist
⭐️⭐️⭐️⭐️⭐️
An A/B testing tool that doesn't slow down our site or require a dev team. It's so simple but incredibly powerful. We ran our first test in minutes.
Mike T. — Founder @ DTC Brand
⭐️⭐️⭐️⭐️⭐️
Stellar is refreshingly lightweight and ridiculously easy to use. My team got experiments running without having to call in developers. Game changer!
Sarah J. — Marketing Lead
⭐️⭐️⭐️⭐️⭐️
Stellar keeps it simple but does everything you need. Fast, lightweight, and no unnecessary complexity. Also, their support team are absolute legends.
David R. — SaaS Product Manager
⭐️⭐️⭐️⭐️⭐️
Switched to Stellar after dealing with slow, clunky testing platforms. The difference is night and day. Setup is fast, the script is tiny, and our site loads just as fast as before. Highly recommend.
Tom G. — Lead Designer
⭐️⭐️⭐️⭐️⭐️
Ran my first test in five minutes and without a developer. Reporting is clear, setup is easy, and it just works.
Emily W. — Conversion Specialist
⭐️⭐️⭐️⭐️⭐️
The perfect alternative to all those bloated testing tools. Their support team actually knows A/B testing and helps when you need it.
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.
Pricing
Free
Up to 25k MTU
Built-in analytics
Visual web editor
Custom CSS & JS editor
AI editor assistant
Basic A/B testing
Limited variants & goals
Limited concurrent experiments
Pro
50k MTU included
Unlimited variants
Unlimited concurrent experiments
Advanced targeting rules
Dynamic keyword insertion
Priority support
Enterprise
Custom MTU volume
Custom solutions
Integrations support
Unlike competitors who charge in fixed large blocks, we dynamically bill in small increments of 1k MTU, ensuring you never overpay
Compared to average competitors like VWO's $4,700/year for 50k MTU, our equivalent annual cost is just $1,118
We only count users who actually see experiments. Multiple experiment views from the same user count as just 1 MTU