Many A/B testing tools add tens or hundreds of kilobytes to every page load. Stellar stays lean so your site speed does not become the hidden variable in every test.
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.
When your testing platform slows pages down, you cannot tell whether a variant lost because of the copy or because of performance. Stellar keeps experiments lightweight so results reflect the change you made.
Stellar prioritizes experimentation essentials—variants, goals, and analytics—instead of bundling heavy extras that inflate script size.
The Stellar snippet and active experiments are served from CDN infrastructure for fast delivery worldwide.
Add one script tag to WordPress, Webflow, Shopify, or custom stacks—no platform-specific plugin required.
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
50k MTU included
Unlimited variants
Unlimited concurrent experiments
Advanced targeting rules
Dynamic keyword insertion
AI insights & recommendations
Priority support
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