DeepEval
Observability & Evals · Free + paid
Open-source LLM evaluation framework
At a glance
- Made by
- Confident AI
- Korean
- None (English and a few others only)
- Available on
- CLI
- Open source
- Open source (license name not in the provided text)
- GitHub
- 18,843 stars · Apache-2.0
What is DeepEval?
DeepEval is an open-source evaluation framework for LLM applications. It is similar to Pytest but specialized for unit testing LLM apps. It provides more than 50 ready-made metrics covering LLM-as-a-judge, agents, tool use, conversation, voice, safety, RAG, multimodal, and more. It evaluates agents, chatbots, voice AI, RAG pipelines, and MCP systems end to end, by trajectory, and at the component level, and evaluations run locally in the user's own environment. If you need shared dashboards, regression tracking, or production monitoring, it integrates with the Confident AI platform.
- Pytest-style LLM unit testing (runs in CI/CD)
- 50+ research-backed metrics (hallucination, faithfulness, answer relevancy, toxicity, bias, etc.)
- Metrics dedicated to conversational and voice evaluation
- G-Eval, DAG, QAG, and JevEval evaluation techniques
- Tracing and scoring of each agent step
- Synthetic golden data generation and conversation simulation from a knowledge base
- CLI evaluation harness for Cursor, Claude Code, and Codex
- Confident AI platform integration
Who uses DeepEval and for what
- AI engineers: evaluating agents, RAG, and tool calls, and unit testing AI behavior
- QA: regression testing of AI behavior before changes
- Data scientists: comparison experiments across prompts, models, and datasets
Pricing
Open source + paid cloud-managed plans
Open-source edition is free, SaaS managed edition is a paid subscription based on usage/seats
Estimate based on AI knowledge - please verify on the official site
Combos that work well with DeepEval
Verifying AI answers and SEO drafts
ChatGPT evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith tracks them. Responses below the threshold are not published automatically; the prompts, search, and data are fixed instead.
Cost: API pay-as-you-go + subscription (ChatGPT) / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Claude evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith tracks them. Responses below the standard are not published automatically, and the prompts, retrieval, and data are fixed.
Cost: Freemium (free + paid subscription) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Gemini evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces them. Responses that fall below the standard are not published automatically; prompts, retrieval, and data are revised instead.
Cost: Freemium (free + paid subscription) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
DeepSeek evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces them. Responses that fall below the standard are not published automatically; prompts, retrieval, and data are revised instead.
Cost: Open source (free) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Perplexity evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces them. Responses that fall below the standard are not published automatically; the prompts, retrieval, and data are fixed.
Cost: Freemium (free + paid subscription) / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Grok-2 evaluates response quality against a question set and ground-truth evidence. The LangSmith + Ragas + DeepEval combo has Ragas and DeepEval score hallucination, groundedness, and consistency, while LangSmith handles tracing. Responses below the standard are not published automatically; the prompts, retrieval, and data are fixed instead.
Cost: Subscription (including X subscription) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Llama evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces the results. Responses below the threshold are not published automatically; the prompts, retrieval, and data are fixed instead.
Cost: Open source (free, license conditions apply) / Open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Mistral evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces the results. Responses below the threshold are not published automatically; the prompts, retrieval, and data are fixed instead.
Cost: Open source (free) + API pay-as-you-go / open source + paid managed cloud plan
AI tools similar to DeepEval (alternatives)
DeepEval vs. alternatives at a glance
| AI | Pricing | Combos on the map | Connected tools | Free | Cheapest monthly | Korean |
|---|---|---|---|---|---|---|
| DeepEval | Free + paid | 10 | 7 | — | — | No |
| Braintrust | Free + paid | 0 | 7 | Yes | $249/mo | No |
| EleutherAI LM Evaluation Harness | Free + paid | 0 | 7 | — | — | — |
| HumanEval | Free + paid | 0 | 7 | — | — | — |
| LangSmith | Free + paid | 10 | 5 | — | — | — |
1 of these 5 tools have a free plan. Cheapest paid plan: Braintrust ($249/mo).
Combo and connection counts are based on the relationships recorded on AI Galaxy Map (2026-10-26); they are not a quality ranking.
DeepEval on AI Galaxy Map
- One of 27 AI tools in the Observability & Evals field.
- Connected to 7 other tools — #1 in its field.
- Part of 10 work combos recorded on the map.
Frequently asked questions
Can I use DeepEval for free?
Open source + paid cloud-managed plans. Prices can change, so check the official site before paying.
What works well with DeepEval?
Based on the combos on the map, there is a workflow such as "Verifying AI answers and SEO drafts" that uses it together with GPT, LangSmith, Ragas.
What AI can I use instead of DeepEval?
Tools that do the same job, such as Braintrust, EleutherAI LM Evaluation Harness, HumanEval, LangSmith, are connected to it on the map.
Can I use DeepEval in Korean?
None (English and a few others only)
Sources (official pages)
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying.