--- title: "Measure site iterations with Split Testing | Netlify" description: "Realize the speed, agility and performance of a scalable, composable web architecture with Netlify. Explore the composable web platform now!" source: "https://www.netlify.com/blog/2021/12/18/measure-site-iterations-with-split-testing/" last_updated: "2026-07-10T19:44:14.000Z" --- > Throughout December we’ll be [highlighting a different Netlify feature each day](https://www.netlify.com/blog/2021/12/01/highlighting-a-different-netlify-feature-each-day-in-december/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests). It might just be the thing you need to unlock those creative juices, and [dust off that domain](https://www.netlify.com/blog/2021/12/01/dusty-domains-your-forgotten-domains-raise-money-for-charity/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests) you registered but never deployed! Keep an eye [on the blog](https://www.netlify.com/blog/2021/12/01/highlighting-a-different-netlify-feature-each-day-in-december/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests) and on [Twitter](https://twitter.com/netlify) for each feature! Earlier this month, we saw how [Branch Deploys](https://www.netlify.com/blog/2021/12/05/unlimited-environments-thanks-to-branch-deploys/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests) could serve different versions of your site. Today’s highlighted feature makes use of that capability as basis for another useful utility: Split testing. Split testing (otherwise knowns as A/B or multi-variant testing) is a way of serving experimental iterations of your site to a sample of your visitors. It’s a great way to test how effective a user interface change or alternate copy might perform, before you decide to roll it out to everyone. Some split testing tools make this possible with client-side rendering, which can itself impact performance and as a result, interfere with the performance of your experiment, but Netlify’s approach is different. Netlify’s Split Testing feature avoids this performance compromise by serving each variant in exactly the same way, from exactly the same infrastructure. Thanks to Branch Deploys no client-side rendering of the different versions is required. Everything is served in the same way as in production. ![The configuration UI for a split test, where 10% of the traffic is being served by a feature branch](/v3/img/blog/screenshot-split-test-10pc.jpg "Split Testing user interface") You can create a new split test and start sending any proportion of your site’s visitors to your different branches from the Split Testing page of your [site’s admin app](https://app.netlify.com/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests). ## Some useful details The URL of the branch being served to your visitors under a split test is not visible to them. Netlify handles this for you and serves the correct branch deploy to your visitors without updating the production URL that they visit. Your visitors will always get a consistent experience when using your site during a split test thanks to what we call “branch affinity”. In other words, we ensure that visitors consistently use the same branch that they are assigned to under a split test. No worries about the UI changing before their eyes as they navigate around. You can start and stop a split test instantly via the Netlify Admin. These configurations are applied to our [Edge network](https://www.netlify.com/products/edge/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests) and take effect in milliseconds. ## More information - [Docs: Split testing](https://docs.netlify.com/site-deploys/split-testing/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests) - [Netlify pro tip: Using Split Testing to power private beta releases](https://www.netlify.com/blog/2019/09/11/netlify-pro-tip-using-split-testing-to-power-private-beta-releases/?utm_campaign=featdaily21&utm_source=netlify&utm_medium=blog&utm_content=split-tests) ### Share - [X (fka Twitter)](https://twitter.com/intent/tweet?text=Measure site iterations with Split Testing&url=https://www.netlify.com/blog/2021/12/18/measure-site-iterations-with-split-testing//) - [LinkedIn](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.netlify.com%2Fblog%2F2021%2F12%2F18%2Fmeasure-site-iterations-with-split-testing%2F%2F) - [Facebook](https://www.facebook.com/sharer.php?u=https://www.netlify.com/blog/2021/12/18/measure-site-iterations-with-split-testing//) - [Bluesky](https://bsky.app/intent/compose?text=Measure site iterations with Split Testing+https://www.netlify.com/blog/2021/12/18/measure-site-iterations-with-split-testing//) * * * ### Tags - [Features](/blog/tags/features/) - [Development](/blog/tags/development/) - [Split Testing](/blog/tags/split-testing/) ## Keep reading ![](/images/blog-fallback-thumbnail.svg) Guides & Tutorials September 11, 2019 [ ### Netlify pro tip: Using Split Testing to power private beta releases ](/blog/2019/09/11/netlify-pro-tip-using-split-testing-to-power-private-beta-releases/) - ![Profile picture of Phil Hawksworth](/_astro/9cfe2bbe94bcb555ce3ac7683ac7905ad3fd32b1-400x400_Z18H6R1.webp) Phil Hawksworth ![](/images/blog-fallback-thumbnail.svg) News & Announcements November 16, 2017 [ ### Get full control over your deployed branches ](/blog/2017/11/16/get-full-control-over-your-deployed-branches/) - ![Profile picture of David Calavera](/_astro/b2c93213782e53ba9493a107f1917a1a44d0d9e5-80x80_tFwf6.webp) David Calavera ## Recent posts News & Announcements June 25, 2026 [ ### Netlify Functions, designed for Agent Experience ](/blog/netlify-functions-designed-for-agent-experience) - ![Profile picture of Eduardo Bouças](/_astro/52958f21e8450baf6d8e60302341a984e220c0cd-512x512_13VDlu.webp) Eduardo Bouças News & Announcements June 24, 2026 [ ### How we measure Netlify’s Agent Experience ](/blog/how-we-measure-netlify-agent-experience) - ![Profile picture of Sean Roberts](/_astro/bbf2243f8171dbddd80ab2103622106cef84d125-512x512_Z1d2LKE.webp) Sean Roberts Guides & Tutorials May 15, 2026 [ ### How to build a real-time AI chatbot in minutes with Netlify Agent Runners (no backend) ](/blog/how-to-build-a-real-time-ai-chatbot-in-minutes-with-netlify-agent-runners-no-backend) - ![Profile picture of Nahrin Jalal](/_astro/f0e7c8f227a03fe58340c99ef5439d5a896c0733-272x272_Z23kDpD.webp) Nahrin Jalal ![](/_astro/3f255b372fa958df35802666ee33b4609b2d71bd-1200x1586_1VtE2D.webp) ### How do the best dev and marketing teams work together? [Access the report](https://www.netlify.com/reports/2024-leadership-trend-report/access/)