LLM gateway, logging and evaluation platform (formerly Keywords AI): routes calls to many models through one API and records traces, cost and scores.
Pricing and hosting
- Pricing
- Free plan
- Free plan
- 100k logs, 1k scores
- Open source
- No
- Self-hosted
- Yes
- Status
- Active
- Website
- respan.ai
Plans and prices change; check the tool's own site before you decide.
What it does
LLM and AI observability checklist
7 of 10 confirmed in Respan's own documentation. The same checklist is used for every tool in LLM observability.
- LLM call tracing Yes
- Agent and multi-step traces Yes
- Token and cost tracking Yes
- Prompt management Not confirmed
- Evaluations Yes
- Datasets and experiments Yes
- User feedback Yes
- OpenTelemetry support Not confirmed
- Playground Not confirmed
- Alerts Yes
Docs site timed out (522); judged from the homepage only.
Checked against: respan.ai
Alternatives to Respan
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Arize Phoenix Source-available LLM tracing and evaluation tool built on OpenTelemetry and OpenInference; run it locally, in a notebook or on your servers to inspect traces and score outputs. -
Braintrust Evaluation and observability platform for AI products: logs production traces, runs evals and scorers, and offers a prompt playground and datasets. -
Confident AI Evaluation and observability platform from the makers of the open source DeepEval library: LLM tracing, regression tests in CI, and red teaming. -
Future AGI Open source platform to trace, evaluate, simulate and guard LLM and agent apps, including an AI gateway. -
Galileo AI evaluation and observability platform with tracing, evaluation metrics and real-time guardrails for agents; hosted, VPC or on-prem. -
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HoneyHive Observability and evaluation platform for AI agents: OpenTelemetry-based tracing, automated and human evals, prompt versioning and production monitoring. -
Laminar Open source observability for AI agents: OpenTelemetry-based tracing, evaluations and analysis of agent runs, self-hostable or cloud. -
Langfuse Open source LLM engineering platform: traces LLM and agent calls, manages prompts, runs evaluations and tracks cost and latency. Self-host or use the cloud; acquired by ClickHouse in 2026. -
LangSmith LangChain's platform for tracing, evaluating and monitoring LLM apps and agents, usable with or without LangChain; also hosts agent deployments.