Optimizely vs PostHog
Optimizely
Enterprise experimentation platform spanning client-side web testing and server-side feature experimentation, sold within a broader digital experience suite.
Full directory entry →PostHog
Open-source platform bundling product analytics, session replay, feature flags, experiments, and surveys on a single ClickHouse-backed event store.
Full directory entry →Facts, side by side
| Optimizely | PostHog | |
|---|---|---|
| Pricing model | enterprise | freemium |
| Pricing notes | Quote-based; Optimizely publishes no list prices — every plan is individually packaged, and Web Experimentation and Feature Experimentation are licensed separately. | 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. |
| Open source | No | Yes |
| Self-hostable | No — SaaS; the open-source Optimizely Agent can run in your infrastructure for server-side flag evaluation, but the platform cannot. | 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. |
| Categories | Experimentation | Product analytics, Session replay, Experimentation |
| Who it's for | measurement managers, marketing managers, implementation engineers | implementation engineers, data engineers, measurement managers |
| Integrations listed | 5 | 5 |
Directory entries last updated: Optimizely 2026-07-18 · PostHog 2026-07-18.
In brief
Optimizely — Enterprise experimentation platform spanning client-side web testing and server-side feature experimentation, sold within a broader digital experience suite. Pricing: enterprise. Quote-based; Optimizely publishes no list prices — every plan is individually packaged, and Web Experimentation and Feature Experimentation are licensed separately. Self-hosting: No — SaaS; the open-source Optimizely Agent can run in your infrastructure for server-side flag evaluation, but the platform cannot.. Listed integrations: google-analytics-4, adobe-analytics, segment, amplitude, google-tag-manager.
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.
Which one, when
Derived mechanically from the structured facts above — deltas only, not an editorial verdict. Where the facts tie, read both entries.
- its entry lists marketing managers in "who it's for"; PostHog's does not
- its pricing model is freemium, where Optimizely is enterprise
- you want an open-source codebase — Optimizely is not open source
- you need at least partial self-hosting — Optimizely offers none
- you also need Product analytics, Session replay — not a listed category for Optimizely
- its entry lists data engineers in "who it's for"; Optimizely's does not
Also compare
OPTIMIZELY VS: GrowthBook · Statsig · VWO
POSTHOG VS: Amplitude · Fullstory · GrowthBook · Heap · Hotjar · LogRocket · Microsoft Clarity · Mixpanel · RudderStack · Segment · Snowplow · Statsig · VWO