PostHog joins the Vercel Marketplace

PostHog is now available in the Vercel Marketplace as a feature flags, experimentation and Analytics provider.

With this integration, you can now:

• Declare flags in code using Flags SDK and the @flags-sdk/posthog adapter

• Toggle features in real time for specific users or cohorts

• Roll out changes gradually using percentage-based rollouts

• Run A/B tests to validate impact before a full release

This integration helps teams building on Vercel ship with more confidence. You can test in production, reduce release risk, and make data-driven decisions based on real user behavior, all within your existing Vercel workflows.

Create a flags.ts file with an identify function and a flag check:

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import { postHogAdapter } from '@flags-sdk/posthog'
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import { flag, dedupe } from 'flags/next'
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import type { Identify } from 'flags'
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export const identify = dedupe(async () => ({
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  distinctId: 'user_distinct_id'  // replace with real user ID
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})) satisfies Identify<{ distinctId: string }>
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export const myFlag = flag({
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  key: 'my-flag',
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  adapter: postHogAdapter.isFeatureEnabled(),
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  identify,
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})

Check out the PostHog template to learn more about this integration.