PostHog combines product analytics, session replay, feature flags, A/B experiments, surveys, and a data warehouse in one platform. It is open source, self-hostable, and ships SDKs for most stacks, aimed at teams that want to understand and act on in-product behaviour.

Highlights

Analytics, replays, flags, and experiments in one place
Generous free tier
Open source and self-hostable
SDKs for most languages and frameworks

Watch-outs

Broad surface area has a learning curve
Usage-based costs can grow with high event volume
Heavier than a simple analytics script

Good for

Privacy-friendly analytics Product analytics

PostHog is the choice when you want to understand behaviour inside a product — funnels, retention, replays, and feature flags — rather than just pageviews. It rewards teams who will use that depth. If you only need clean, privacy-friendly traffic stats for a marketing site, Plausible is simpler and lighter; PostHog is for builders instrumenting an app.

When to use it

product_teams
saas_builders
data_driven_startups

Avoid if

just_want_simple_privacy_analytics
dont_want_to_manage_event_volume

Free

Free tierOpen sourceAPI

Generous free tier with monthly event/recording allowances; usage-based pricing beyond that. Open source with a self-host option.

Integrations
Native
API access
Native
SDKs
Native
Self-hostable
Native
Open source
Native

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PostHog

Highlights

Watch-outs

Good for

When to use it