Confident AI (DeepEval) vs Opik
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Freemium
The cloud platform behind DeepEval, an open-source framework for unit-testing LLM outputs with ready-made metrics.
AI tool · Open source
Comet's open-source platform for logging, evaluating and monitoring LLM apps, including prompt optimisation.
The short answer
Choose Confident AI (DeepEval) if you need…
- Pytest-style LLM tests
- RAG evaluation metrics
Choose Opik if you need…
- Open-source tracing and evals
- Automated prompt optimisation
Side-by-side
| Confident AI (DeepEval) | Opik | |
|---|---|---|
| Type | Prompting · Evaluation & observability | Prompting · Evaluation & observability |
| Price | Freemium | Open source |
| Platforms | Web, API, CLI | Web, Self-hosted, API |
| Works with | LangChain, LlamaIndex | LangChain, OpenAI |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
Confident AI (DeepEval)
The cloud platform behind DeepEval, an open-source framework for unit-testing LLM outputs with ready-made metrics. Easy to drop into Python test suites. LLM-judged metrics can be noisy, so calibrate them against human review.
Opik
Comet's open-source platform for logging, evaluating and monitoring LLM apps, including prompt optimisation. Generous open-source feature set. Younger than some rivals, so expect rough edges.
Best for
Confident AI (DeepEval)
- Pytest-style LLM tests
- RAG evaluation metrics
Opik
- Open-source tracing and evals
- Automated prompt optimisation
Strengths
Confident AI (DeepEval)
- Open-source DeepEval metrics
- Test datasets
- Regression reports
- Tracing
Opik
- Tracing and logging
- LLM-as-judge metrics
- Prompt library
- Agent optimiser
Frequently asked questions
What is the difference between Confident AI (DeepEval) and Opik?
Confident AI (DeepEval): The cloud platform behind DeepEval, an open-source framework for unit-testing LLM outputs with ready-made metrics. Opik: Comet's open-source platform for logging, evaluating and monitoring LLM apps, including prompt optimisation. Confident AI (DeepEval) suits pytest-style llm tests, while Opik suits open-source tracing and evals.
Are Confident AI (DeepEval) and Opik free?
Confident AI (DeepEval): Freemium. Opik: Open source.
What are other alternatives to Confident AI (DeepEval) and Opik?
Other options people compare them with include Langfuse, Arize Phoenix, LangSmith, promptfoo, Braintrust.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.