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Opik by Comet is a llm observability & evals tool with a free tier. We looked at what you actually get, what real users say, and whether the price matches the value. Here's our take.
Opik by Comet is worth it if you need llm observability & evals tools. True apache 2.0 open source with a self-hostable backend — no source-available rug pull risk makes it a solid choice.
💰 Bottom line: Free gets you open-source llm evaluation and observability framework: trace, evaluate, monitor, and improve llm applications
For Free, here's what that buys you:
$0/mo ÷ 8 hours saved = $0.00 per hour of value
Compare that to hiring a $llm observability & evals professional at $40/hour
Even at minimum wage ($15/hr), Opik by Comet saves you $120 over doing it manually.
We're not here to sell you Opik by Comet. Here's what you should know before buying:
Quick comparison (not a full review):
LangSmith helps developers trace, evaluate, test, and monitor applications built with language models and agent workflows.
LangSmith: Better if you need Developer teams building production LangChain, LangGraph, RAG, or agentic LLM applications that need trace-level debugging and repeatable evaluations.
Opik by Comet: Better if you need comprehensive features
Open-source LLM observability and gateway platform offering one-line integration, request logging, prompt management, evals, and a multi-provider proxy.
Helicone: Better if you need their specific features
Opik by Comet: Better if you need comprehensive features
Braintrust review 2026: unified evals, prompt workbench, observability, and AI proxy used by OpenAI, Stripe, Notion — features, pricing, pros, cons.
Braintrust: Better if you need Engineering teams building production LLM applications who need both monitoring and automated optimization. Ideal for companies with dedicated AI engineering resources who want to move beyond manual prompt tuning to data-driven optimization workflows.
Opik by Comet: Better if you need comprehensive features
| Use Case | Verdict | Why |
|---|---|---|
| Freelancers | ⚠️ | Affordable for solo professionals |
| Students | ✅ | Free tier available for learning |
| Small Teams (2-10) | ✅ | Check if team features are available |
| Enterprise | ✅ | Enterprise features and support needed |
Opik by Comet may have a learning curve for beginners. Consider starting with the free tier before committing to paid plans.
Opik by Comet remains relevant in 2026 with This record was last enriched on 2026-06-04. Current Comet pricing information verified on 2026-06-04 lists Opik Open Source at $0, Free Cloud at $0 with up to 10 team members, 25k spans per month, and 60-day retention, Pro Cloud at $19 per month with up to 50 team members, 100k spans per month, and 60-day retention, and Enterprise at a custom quote. No specific 2026 release notes, launch announcements, roadmap items, or newly added features were present in the supplied scraped website content. The current factual positioning remains that Opik by Comet is an open-source, freemium LLM observability and evaluation framework focused on tracing, evaluating, monitoring, prompt-related workflows, and improvement of LLM applications.. The llm observability & evals market continues to grow, making it a solid investment for professionals.
The free tier covers basic needs but upgrading unlocks advanced features like premium functionality. Most professionals will need the paid version.
Compare the features you actually need against each plan to find the best value for your use case.
While there are other llm observability & evals tools available, Opik by Comet's feature set and reliability often justify its pricing. Compare alternatives carefully.
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Last verified March 2026