Respan (formerly Keywords AI) vs Weights & Biases

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	Respan (formerly Keywords AI) Evaluation	Weights & Biases Evaluation
Tagline	LLM engineering platform combining a multi-model gateway with tracing, evals, and prompt management.	The ML experiment tracker, now with LLM eval features.
Category	Evaluation	Evaluation
Pricing	Freemium· Free tier; paid plans (pricing not public); enterprise on request	Freemium· Free personal; team from $50/mo per seat
Model	Multi-model (500+ via gateway)	Platform (any LLM)
Editorial score	—	8.4 / 10
Use cases	llm-observabilityprompt-managementmodel-routingevalsproduction-monitoring	ML experimentsLLM evalWeave
Pros	Unified gateway to 500+ models with fallback and error handling End-to-end loop: trace, evaluate, monitor, version prompts in one UI Eval system mixes rules, AI judges, and human review Broad SDK and framework coverage (LangChain, LlamaIndex, Vercel AI SDK) YC-backed with serious production scale (80T+ tokens claimed)	Industry-standard for ML tracking Weave adds LLM-native eval Mature, reliable Strong enterprise features
Cons	Closed source — no self-host option for most customers Paid pricing not transparent on the site Recent rebrand from Keywords AI may cause doc and link churn Gateway dependency adds a network hop and vendor lock-in	Heavier UX than LLM-native tools LLM features still catching up
Website	www.respan.ai	wandb.ai

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