PostHog vs Segment
PostHog
Open-source platform bundling product analytics, session replay, feature flags, experiments, and surveys on a single ClickHouse-backed event store.
Full directory entry →Segment
Twilio's customer data platform that collects events once against a shared spec and fans them out to hundreds of destinations.
Full directory entry →Facts, side by side
| PostHog | Segment | |
|---|---|---|
| Pricing model | freemium | freemium · from $120 |
| Pricing notes | Usage-based per product with monthly free allowances on Cloud (1M analytics events, 5K replays, 1M flag requests, 1.5K survey responses); per-unit rates fall with volume and anonymous events are billed cheaper than identified ones. The open-source Docker deploy is free. | Free tier includes 1,000 visitors/mo, 2 sources, and 1 warehouse destination; Team starts at $120/mo (annual billing saves up to 20%) with 10,000 visitors/mo included and tiered MTU overages of $10-12 per 1,000; Business is custom-quoted on MTUs and gates Unify identity resolution, Protocols, HIPAA eligibility, and EU deployment. |
| Open source | Yes | No |
| Self-hostable | Partial — A Docker Compose hobby deploy is supported at small scale; large self-hosted instances are no longer sold or supported as a paid product. | No — SDKs and libraries are open source; the platform itself is SaaS-only. |
| Categories | Product analytics, Session replay, Experimentation | CDP |
| Who it's for | implementation engineers, data engineers, measurement managers | implementation engineers, data engineers, marketing managers |
| Integrations listed | 5 | 5 |
Directory entries last updated: PostHog 2026-07-18 · Segment 2026-07-18.
In brief
PostHog — Open-source platform bundling product analytics, session replay, feature flags, experiments, and surveys on a single ClickHouse-backed event store. Pricing: freemium. Usage-based per product with monthly free allowances on Cloud (1M analytics events, 5K replays, 1M flag requests, 1.5K survey responses); per-unit rates fall with volume and anonymous events are billed cheaper than identified ones. The open-source Docker deploy is free. Self-hosting: Partial — A Docker Compose hobby deploy is supported at small scale; large self-hosted instances are no longer sold or supported as a paid product.. Listed integrations: segment, rudderstack, bigquery, snowflake, hightouch.
Segment — Twilio's customer data platform that collects events once against a shared spec and fans them out to hundreds of destinations. Pricing: freemium · from $120. Free tier includes 1,000 visitors/mo, 2 sources, and 1 warehouse destination; Team starts at $120/mo (annual billing saves up to 20%) with 10,000 visitors/mo included and tiered MTU overages of $10-12 per 1,000; Business is custom-quoted on MTUs and gates Unify identity resolution, Protocols, HIPAA eligibility, and EU deployment. Self-hosting: No — SDKs and libraries are open source; the platform itself is SaaS-only.. Listed integrations: google-analytics-4, amplitude, mixpanel, bigquery, snowflake.
Which one, when
Derived mechanically from the structured facts above — deltas only, not an editorial verdict. Where the facts tie, read both entries.
- you want an open-source codebase — Segment is not open source
- you need at least partial self-hosting — Segment offers none
- you also need Product analytics, Session replay, Experimentation — not a listed category for Segment
- its entry lists measurement managers in "who it's for"; Segment's does not
- you also need CDP — not a listed category for PostHog
- its entry lists marketing managers in "who it's for"; PostHog's does not
Also compare
POSTHOG VS: Amplitude · Fullstory · GrowthBook · Heap · Hotjar · LogRocket · Microsoft Clarity · Mixpanel · Optimizely · RudderStack · Snowplow · Statsig · VWO
SEGMENT VS: Census · Google Tag Manager (Server-Side) · Hightouch · mParticle · RudderStack · Snowplow · Tealium iQ