TruLens alternatives
6 evaluation tools in the same lane as TruLens, ranked by editorial score.
OE
OpenAI Evals
Evaluation · OpenAI GPT models (extensible)
8.1
OpenAI's open-source framework for benchmarking LLMs against a shared registry of evaluations.
Free· Free (MIT); you pay OpenAI API costs for eval runsllm-benchmarkingregression-testing
OP
Opik
Evaluation · Multi-model
7.3
Open-source LLM observability and evaluation platform for debugging and monitoring AI agents in production.
Freemium· Free open-source self-host; free Cloud tier (no card); Enterprise contact salesllm-tracingagent-evaluation
PR
Promptfoo
Evaluation · Multi-model
7.2
Open-source eval and red-teaming framework for LLM apps, prompts, and RAG pipelines.
Freemium· Community: Free · Enterprise: Custom · On-Premise: Customllm-evalsred-teaming
LA
Langfuse
Evaluation · Model-agnostic
7.3
Open-source LLM observability, prompt management, and evaluation in one platform.
Freemium· Free self-host & Hobby tier; Core $29/mo, Pro $199/mo, Enterprise $2,499/mollm-observabilityprompt-management
PH
Phoenix
Evaluation · Multi-model
7.0
Open-source LLM and agent observability platform with tracing, evals, and experimentation built on OpenTelemetry.
Freemium· AX Free: Free · AX Pro: $50 · AX Enterprise: Customllm-tracingagent-debugging
HE
Helicone
Evaluation · Platform (any LLM)
8.3
Open-source LLM observability — one-line proxy install.
Freemium· Free 100k req/mo; Pro from $25/moobservabilitycost tracking