Flags SDK by Vercel
Free, open-source library for using feature flags in Next.js
Flags SDK by Vercel launched on February 23, 2025 with 433 votes, #66 of 5,999 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Flags SDK by Vercel is a free, open-source library for implementing feature flags and A/B tests in Next.js applications. Created by Vercel, it works with any flag provider or custom setup and supports both App Router and Pages Router, as well as Middleware. The library is designed for developers building with Next.js who need flexible feature flag management without vendor lock-in.
written from the facts on this page · September 2026
From the sources
From the creators of Next.js, the Flags SDK is a free open-source library for implementing feature flags and A/B tests in your applications. Works with any flag provider or custom setup. Compatible with App Router, Pages Router, and Middleware.
Flags SDK is a free, open-source library for using feature flags in Next.js and SvelteKit. The SDK sits between your application and the source of your flags, helping you follow best practices and keep your website fast. Use any flag provider, or none at all. Flexible integrations for your projects. Integrate with App Router, Pages Router, and Routing Middleware. Ideal for A/B testing and controlled rollouts. Experiment with confidence. With a simple declarative API to define and use your feature flags. import { flag } from ' flags/next ' ; export const exampleFlag = flag ( { key : ' example-flag ' , decide () { return Math . random () > 0.5 ; }, } ) ; Declaring a flag app/page.tsx import {…from flags-sdk.dev
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