---
title: "Best A/B Testing Tools for Vercel Deployments"
description: "Vercel's own Edge Config is the obvious default, but it's not the only option if you're deployed there — here's the honest comparison for a Vercel-hosted Next.js app."
canonical: https://landtest.dev/blog/best-ab-testing-tools-vercel-deployments
last-updated: 2026-10-30
---

# Best A/B Testing Tools for Vercel Deployments

> Vercel's own Edge Config is the obvious default, but it's not the only option if you're deployed there — here's the honest comparison for a Vercel-hosted Next.js app.

For a Vercel-hosted Next.js app, the best A/B testing options are Vercel Edge Config (native integration, sub-15ms edge reads, zero flicker), GrowthBook (open-source, works fine on Vercel without being tied to it), and Landtest (deploy-layer split, no middleware ownership). Being on Vercel specifically makes Edge Config the lowest-friction default, but it's not automatically the right call if you'd rather avoid adding to `middleware.ts` or want a tool that isn't platform-locked in case you ever move.

This is Landtest's own comparison content. Last updated 2026-09-30.

## Vercel Edge Config — the native default

If you're fully committed to Vercel and want the tightest integration, Edge Config plus Edge Middleware is purpose-built for this: [Vercel's own zero-CLS guide](https://vercel.com/blog/zero-cls-experiments-nextjs-edge-config) documents sub-15ms P99 reads with assignment happening before the response renders. The tradeoff is that the split logic lives in your `middleware.ts`, and the approach is Vercel-specific — see [Vercel Edge Config vs Landtest](/blog/vercel-edge-config-vs-landtest) for the direct comparison if middleware composition is already a concern.

## GrowthBook — platform-agnostic, works fine on Vercel

GrowthBook doesn't care which host you're on, and its self-hosted option is free under MIT license. On Vercel specifically, you'd typically implement the flag check in middleware or a server component, similar in shape to a hand-rolled Edge Config integration, but backed by GrowthBook's broader experimentation platform rather than Vercel's own primitive.

## Landtest — split at the deploy layer, host-agnostic

Landtest's variant-as-branch, split-at-deploy-layer approach works the same way whether you're on Vercel or elsewhere, and avoids adding to `middleware.ts` specifically — relevant if that file already carries auth (Clerk, NextAuth) or locale routing logic. The tradeoff versus Edge Config is giving up Vercel's specific latency numbers in exchange for not being tied to the platform.

## Which one to pick

If you're committed to Vercel indefinitely and want the lowest possible latency, Edge Config is hard to beat. If you want a platform-agnostic option in case you ever reconsider hosting, or you'd rather not add split logic to middleware at all, GrowthBook or Landtest are the better fits, with the choice between those two coming down to whether you want to self-host a platform (GrowthBook) or avoid owning the split logic entirely (Landtest).

## FAQ

**Is Vercel Edge Config the best option if I'm on Vercel?**
It's the lowest-latency, most tightly integrated option, but not automatically the best fit if you want to avoid middleware composition or platform lock-in.

**Does GrowthBook work well on Vercel?**
Yes — it's platform-agnostic and works the same on Vercel as anywhere else, typically via a middleware or server-component flag check.

**Does Landtest require Vercel?**
No — Landtest's deploy-layer split works with any host, including but not limited to Vercel.

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Related: [Vercel Edge Config vs Landtest](/blog/vercel-edge-config-vs-landtest) · [Best A/B testing tools for Next.js developers](/blog/best-ab-testing-tools-nextjs-developers) · [Landtest for A/B testing](/ab-testing)