Comet OpikFreemium
An open-source platform for LLM evaluation, tracing, and production monitoring, from the team behind the Comet ML experiment-tracking tool.
Analytics comparison
Comet Opik vs PostHog
Pricing, pros, cons, and ideal use cases — side by side.
PostHogFreemium
Open-source product analytics with session recording, feature flags, and A/B testing in one platform.
At a glance
| Comet Opik | PostHog | |
|---|---|---|
| Pricing | FreemiumOpen-source and free to self-host. Comet offers managed and enterprise plans. | FreemiumFree up to 1M events/month. Self-host free. Pay-as-you-go past free tier. |
| Category | Analytics | Analytics |
| Ideal for | Teams needing open-source LLM observabilityEnterprises with data-residency requirementsExisting Comet ML users | SaaSDevelopersProduct TeamsTech-forward SMBs |
Pros & cons
Comet Opik
Pros
- Open-source tracing, evals, and monitoring
- Backed by an established ML tooling company
- Self-hostable for data residency
- Built-in and custom evaluation metrics
Cons
- Crowded category with strong alternatives
- Self-hosting adds operational work
- Choice often comes down to ecosystem fit
PostHog
Pros
- All-in-one analytics + flags + replay
- Open source and self-hostable
- Generous free tier
- Developer-friendly
Cons
- Requires technical setup
- Self-hosting has infra cost
- Interface is dense
Which should you choose?
Comet Opik is built around teams needing open-source llm observability; PostHog leans more toward saas. Shortlist the one whose strengths line up with your biggest constraint.