> For the complete documentation index, see [llms.txt](https://agenticai.kasinathanramesh.vip/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://agenticai.kasinathanramesh.vip/class-notes.md).

# Class Notes

<figure><img src="/files/pL1u7rYI44z52xH9d6hz" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/HKJb4rG5UYWhhLtdVF6N" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/9YKzHokaW1Jz4YLditRL" alt=""><figcaption></figcaption></figure>

#### Top 5 AI / LLM / Agent Evaluation Tools

1. LangSmith (by LangChain) -&#x20;
2. Ragas - <https://www.ragas.io/>
3. DeepEval - <https://github.com/confident-ai/deepeval>
4. TruLens
5. Promptfoo

DeepEval

RAGAS

{% embed url="<https://deepeval.com/>" %}

{% embed url="<https://github.com/vibrantlabsai/ragas>" %}

Promptfoo → security testing\
DeepEval → validation testing\
Ragas → hallucination & grounding\
TruLens → production monitoring\
OpenAI Evals → benchmarking

## 🧠 Quick Comparison

| Tool         | Strength       | Ideal Use              |
| ------------ | -------------- | ---------------------- |
| DeepEval     | CI/CD testing  | Production validation  |
| Ragas        | RAG evaluation | Knowledge-based LLMs   |
| Promptfoo    | Prompt testing | Security + red teaming |
| TruLens      | Observability  | Runtime monitoring     |
| OpenAI Evals | Benchmarking   | Model comparison       |

| Tool                      | Type                                  | Pricing                    | Open Source      | LangChain Integration | Best For                                                             |
| ------------------------- | ------------------------------------- | -------------------------- | ---------------- | --------------------- | -------------------------------------------------------------------- |
| LangSmith                 | Observability and Evaluation Platform | Freemium (from $0/seat/mo) | No               | Native                | Agent debugging, production monitoring, and LLM-as-judge evaluations |
| Datadog LLM Observability | Observability                         | Contact Sales              | No               | Yes                   | Unified infrastructure and LLM monitoring                            |
| Lunary                    | Observability & Prompt Management     | Freemium (from $0/mo)      | Yes (Apache-2.0) | Yes                   | Lightweight RAG pipeline and chatbot observability                   |
| Helicone                  | LLM Observability & AI Gateway        | Freemium (from $0/mo)      | Yes (Apache-2.0) | Native                | Low-latency proxy for observability and caching                      |
| Langfuse                  | LLM Engineering Platform              | Freemium (from $0/mo)      | Yes (MIT)        | Native                | All-in-one observability, prompts, and evaluations                   |
| TruLens                   | Observability & Evaluation            | Free (Open Source)         | Yes (MIT)        | Community             | RAG Triad evaluation metrics                                         |
| Arize Phoenix             | AI Observability & Evaluation         | Freemium (from $0/mo)      | Yes (ELv2)       | Native                | Local-first RAG observability and evaluation                         |
| Portkey                   | AI Gateway / LLM Routing              | Freemium (from $49/mo)     | Yes (MIT)        | Native                | Production gateway with routing and fallbacks                        |


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