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GrowthBook vs PostHog

GrowthBook and PostHog score alike on the AgentReady. They differ on 9 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

GrowthBook. The warehouse-native platform used by modern product teams for experimentation, feature flags, and product analytics.

PostHog. PostHog is a product analytics platform that helps teams understand customer behavior, automatically diagnose problems, fix bugs, and generate pull requests.

Where GrowthBook is ahead

GrowthBook passes llms-full.txt / full agent docs, and PostHog does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference. PostHog misses it.

And on adopt, fast time to first request and copyable quickstart. PostHog misses those.

Finally, on operate, structured, predictable output. PostHog misses it.

Where PostHog is ahead

PostHog passes clear product positioning, and GrowthBook does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: limits / constraints documented. GrowthBook misses it.

And on adopt, no mandatory sales call and agent-compatible signup flow. GrowthBook misses those.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, programmatic credential creation, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover. PostHog leads 93 to 87. GrowthBook misses clear product positioning; PostHog misses llms-full.txt / full agent docs.

Understand. GrowthBook leads 46 to 38. GrowthBook misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; PostHog misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. PostHog leads 81 to 70. GrowthBook misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation; PostHog misses programmatic credential creation, fast time to first request, copyable quickstart.

Operate. GrowthBook leads 65 to 56. GrowthBook misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; PostHog misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

GrowthBook does not publish a machine-readable starting price and has a free tier. PostHog starts at $0.00005/event and has a free tier.

Signal by signal

Which to pick

GrowthBook clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: GrowthBook and PostHog. Alternatives to each: GrowthBook, PostHog.

An agent can fetch this as data: POST /v1/compare {"slugs": ["growthbook", "posthog"]}