Opik vs Galileo
Both are observability & tracing tools. Here is how they actually differ on price, billing model and deployment.
Opik
Comet's open-source LLM observability and eval platform - the cheapest paid cloud in the category at $19/mo, and the most permissive OSS license. Apache-2.0, full feature set self-hosted, and the fastest-growing project of its peers.
Galileo
The best-funded evaluation-and-observability platform in this space, built around proprietary Luna eval models. Not to be confused with the Google-acquired text-to-UI tool of the same name. Real pricing is sales-led above $100/mo.
| Opik | Galileo | |
|---|---|---|
| Category | Observability & Tracing | Observability & Tracing |
| Our rating | 5/5 | 4/5 |
| Starting price | $19/mo | $100/mo |
| Billing meter | span | span |
| Free plan | Yes | Yes |
| Free self-hosting | Yes, free | No or paid tier only |
| Best for | Teams that want a genuinely feature-complete open-source observability platform, or the cheapest managed cloud, without a license or feature-gate catch | Enterprise GenAI teams that have been burned by production hallucinations and want research-grade eval metrics plus guardrails, and can run a sales process |
Our verdict on Opik
The most honest open-source deal in the category - Apache-2.0, the full feature set self-hosted with no gates, and if you want managed, the cheapest cloud tier here at $19/mo. It is also the fastest-growing project of its peers, which tells you the market agrees. The one real watch-out is per-seat pricing - it scales poorly as your team grows, and a few large-project users report UI slowdown.
Full Opik review →Our verdict on Galileo
Galileo is the best-funded and arguably most research-forward platform here, and the Luna eval models are a real bet on making evaluation cheap enough to run continuously. Two caveats. First, make sure you're evaluating this Galileo and not the design tool that shares the name - the pricing and reviews get conflated constantly. Second, above the $100 Pro tier everything is contact-sales, and self-host is Enterprise-only, so this is a platform you buy through a rep, not a card.
Full Galileo review →Frequently Asked Questions
What is the main difference between Opik and Galileo?
Opik: Teams that want a genuinely feature-complete open-source observability platform, or the cheapest managed cloud, without a license or feature-gate catch Galileo: Enterprise GenAI teams that have been burned by production hallucinations and want research-grade eval metrics plus guardrails, and can run a sales process Both sit in Observability & Tracing, so the decision usually comes down to billing model and deployment rather than raw capability.
Which is cheaper, Opik or Galileo?
It depends entirely on your workload shape, because they meter differently - Opik bills on span and Galileo bills on span. Published starting prices are $19/mo and $100/mo respectively, but those numbers are not comparable until you apply them to the same traffic. Use our cost calculator to model both against your own request volume and span count.
Can I self-host Opik or Galileo?
Opik: Yes, free. Galileo: No or paid tier only. Free self-hosting means no licence fee, not no cost - you still own the infrastructure, upgrades and on-call.