Respan (formerly Keywords AI) alternatives
6 evaluation tools in the same lane as Respan (formerly Keywords AI), ranked by editorial score.
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
AA
Athina AI
Evaluation · Multi-model
8.1
Collaborative LLM evaluation and observability platform for teams shipping AI features to production.
Freemium· Starter free (10k logs/mo); Pro & Enterprise customllm-evaluationprompt-management
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
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
MA
Maxim AI
Evaluation · Multi-model
7.1
End-to-end evaluation, simulation, and observability platform for shipping production-grade AI agents.
Freemium· Developer: Free · Professional: $29 /seat /month · Business: $49 /seat /month · Enterprise: Customagent-evaluationllm-observability
AA
Arize AI
Evaluation · Multi-model
8.2
Enterprise observability and evaluation platform for LLM agents and generative AI applications.
Freemium· AX Free: Free · AX Pro: $50 · AX Enterprise: Customllm-observabilityagent-evaluation