PostHog Integration Now Available

PostHog is now an official provider in the Vercel Marketplace, bringing advanced feature flagging and experimentation capabilities to developers building on Vercel. This integration connects PostHog's feature flags, experimentation, and analytics platform directly into your development workflow.

Key Capabilities

With the PostHog integration, you can:

• Declare flags in code using the Flags SDK and the dedicated @flags-sdk/posthog adapter
• Toggle features in real time for specific users or cohorts without redeployment
• Gradual rollouts using percentage-based feature releases to minimize risk
• Run A/B tests to validate impact before full production releases

Getting Started

The integration provides a straightforward developer experience. Create a flags.ts file with an identify function to reference user context, then define flags with the PostHog adapter. The Flags SDK handles the abstraction layer, making feature flag management consistent across different providers.

Vercel has published a PostHog template to help you get started quickly with example implementations and best practices.

Use Cases

This integration is designed to help teams test in production, reduce release risk, and make data-driven decisions based on real user behavior—all within your existing Vercel deployment platform. It's particularly useful for teams practicing progressive deployments and validation before full rollouts.