Optimizely vs PostHog
Both are in A/B testing. Here is how their plans, prices and features compare, taken from each vendor's own site.
The main differences
- Fees: Optimizely Custom, request a demo; PostHog Same free tier each month, then pay for usage.
| Optimizely | PostHog | |
|---|---|---|
| Starting price | Not verified yet | Free plan |
| Free plan | Not stated by the vendor | Yes |
| Free trial | Not stated by the vendor | Not stated by the vendor |
| Plans | Agentic Experimentation () | Free ($0); Pay-as-you-go () |
| Fees | Custom, request a demo | Same free tier each month, then pay for usage |
| Best for | Not stated | Not stated |
| Key features | A/B, multi-page, feature and server-side testing; Proprietary Stats Engine; Real-time personalization and audience targeting; Warehouse-native analytics | Product and web analytics, 1M events a month free; Session replay, 5,000 recordings a month free; Feature flags (1M requests free) and experiments; Surveys and error tracking |
| Checked on | 2026-10-01 | 2026-10-03 |
Prices change; confirm on the vendor's site before you buy. Full details and sources are on each tool's page.
Optimizely
- Covers web, feature and server-side experimentation in one product
- Warehouse-native analytics
- Part of a wider content and commerce platform
Trade-offs
- No public pricing; plans are packaged individually through a sales conversation
- Built for larger teams rather than small sites
- No free trial listed
PostHog
- Free tier with no credit card that renews monthly, not a trial
- Usage stops at the free limits, so no surprise bills
- Unlimited team members
Trade-offs
- The free plan has 1 project and 1-year data retention
- Pay-as-you-go has no flat price, so cost depends on usage across products
- Platform packages (SSO, audit logs, custom roles) are sold separately