Weights & Biases alternatives
6 evaluation tools in the same lane as Weights & Biases, ranked by editorial score.
WB
W&B Weave
Evaluation · Multi-model
8.1
Production observability, tracing, and evaluation for LLM and agent systems from the Weights & Biases stack.
Freemium· Free tier available; paid and enterprise plans via W&Bllm-tracingagent-observability
ML
MLflow
Evaluation · Multi-model
8.1
Open-source platform for tracking, evaluating, and deploying ML models and LLM applications.
Free· Free and open source (Apache 2.0); managed offering via Databricksllm-evaluationexperiment-tracking
TR
TruLens
Evaluation · Multi-model (LLM-as-judge)
8.1
Open-source evaluation and tracing framework for LLM apps and agents, built on OpenTelemetry.
Free· Free, open source (Apache-licensed Python package)llm-evaluationrag-evaluation
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
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
AG
Agenta
Evaluation · Multi-model
6.9
Open-source LLMOps platform for prompt engineering, evaluation, and observability in one workspace.
Freemium· Hobby: $0 forever · Pro: $29 /month · Business: $299 /month · Enterprise: Custom · Open source: Free foreverprompt-engineeringllm-evaluation